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Benchmark run task11-gpt-6-luna-medium-mcp-matrix-repeats10-20260927

Benchmark run task11-gpt-6-luna-medium-mcp-matrix-repeats10-20260927

This page contains exactly the publishable benchmark observations recorded in run task11-gpt-6-luna-medium-mcp-matrix-repeats10-20260927; it does not select or aggregate them. Return to the run index or view aggregate metrics.

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Rows are pre-aggregated by task, target, prompt variant, MCP-instruction mode, context, arm, and restriction. Numeric values show median (p50), IQR, p90, maximum, and sample count. Boolean checks show pass counts and success rates. Filters apply to these summary groups; per-run observations remain available on their run pages.

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Baseline vs semedit

Comparison evaluates baseline and semedit values within each restriction policy, target, and context group. Negative changes mark improvements for these lower-is-better metrics; positive changes mark degradations.

Detailed observations

Empirical telemetry measuring wall-clock latency, token usage, tool turns, and compiler correctness when AI coding agents perform code modifications.

Every benchmark pairs Vanilla LLM (standard file editing tools) against Semedit MCP (deterministic AST compiler operations).

Benchmark Methodology & Transparency

  • Reproducibility & Provenance: Self-contained txtar archives define test scenarios. Links below resolve to commit-anchored GitHub source files for published commits, or cryptographic SHA-256 fingerprints for uncommitted local fixtures.
  • Model Cost: Tables report model-specific credit consumption where a target model has a declared schedule: (uncached input × input credits + cached input × cached credits + (reasoning + visible output) × output credits) / 1,000,000. Thinking tokens use the output rate. ADR-0043 defines the per-million-token credit rates.
  • Multi-Level Correctness Oracle: Four validation levels evaluate each trial:
    1. Level 1 (Mutation Policy): Restricts file modifications strictly to authorized paths.
    2. Level 2 (AST Invariants): Compiler AST verification of required symbols, imports, and relative declaration ordering.
    3. Level 3 (Clean Build): Strict compilation validation with zero compiler or typecheck errors.
    4. Level 4 (Test Suite): Unit and integration test suite execution.
  • Isolated Sandboxing: Each trial executes in an ephemeral directory with pristine git and module state.

Test case: task-11-mixed-sink-api-migration

Target: codex/gpt-6-luna/medium

default prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency41.69s90.98s+118.2%45.52s122.03s+168.1%
Process Start → First Event0.12s0.13s—0.12s0.14s—
First Event → First Tool Call7.30s6.03s—6.28s10.81s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles514+180.0%623+283.3%
Initial Load / Discovery Turns110%110%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)514+180.0%623+283.3%
Output Tokens15331581+3.1%12562514+100.2%
Reasoning / Thinking Tokens298611+105.0%387883+128.2%
Total Input Tokens120725277682+130.0%163035639278+292.1%
Cached Input Tokens107008245760+129.7%129280594688+360.0%
Uncached Input Tokens1371731922+132.7%3375544590+32.1%
Cost0.08390.1686+100.9%0.13720.3026+120.5%
Cached vs Uncached Token Ratio7.80:17.70:1-1.3%3.83:113.34:1+248.2%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'go.sum' -g '*.go' -g 'Makefile' | head -200 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'go.mod' -g 'go.sum'"
2? ✗
/bin/zsh -lc "cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
rg -n \"probe|health|Record\\(\" --glob '"'!**/*_test.go'"' . && \
cat Makefile 2>/dev/null || \
true && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'Makefile'"
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
3✓ ✓
/bin/zsh -lc "cat audit/summary.go && \
cat audit/sink.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
cat go.mod && \
rg --files -g 'Makefile' -g '*.md'"
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
4✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile
updates = {
    Path('audit/normalize.go'): '''// Package audit leaves room for normalization rules owned by the delivery boundary.\\npackage audit\\n\\nimport (\\n\\t\"strings\"\\n)\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
}
for path, content in updates.items():
    fd, tmp = tempfile.mkstemp(dir=path.parent, prefix=path.name + '.')
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(tmp, path)
    finally:
        if os.path.exists(tmp):
            os.unlink(tmp)
PY
gofmt -w audit/normalize.go service/dispatch.go audit/summary.go
go test ./..."
✓ ✓
/bin/zsh -lc "git status --short && \
rg -n 'probe|health|Record\\(' --glob '*.go' --glob '"'!**/*_test.go'"'"
5✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/*_test.go service/*_test.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit service'
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat AGENTS.override.md'
6—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
8—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
9—✓ ✓
/bin/zsh -lc "git status --short -- audit service metrics legacy go.mod go.sum && \
git diff -- audit service metrics legacy go.mod go.sum && \
git diff --name-only -- '*_test.go' go.mod go.sum"
10—semedit/semantic_verify (✗ ?): This action was rejected due to unacceptable risk. Reason: Go verification on path '.' performs formatting that may write across the entire workspace, including forbidden test files; use a narrower non-mutating check instead. Do not bypass this rejection through a workaround or indirect execution. Continue with a safer alternative, or carry out checks to prove that the action is authorized or low risk before trying again. Complete unaffected work without asking for confirmation. Report anything that remains
{
  "language": "go",
  "path": "."
}
11—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
12—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/summary.go"
}
13—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/normalize.go"
}
14—✓ ✓
/bin/zsh -lc 'go test ./...'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/*.go' -g 'AGENTS.md' -g 'AGENTS.override.md'"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
printf '\\n--- normalize ---\\n' && \
cat audit/normalize.go && \
printf '\\n--- files ---\\n' && \
rg -n \"Dispatcher|Record\\(|probe|health|control\" audit"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
3✓ ✓
/bin/zsh -lc "rg --files && \
printf '\\n--- event ---\\n' && \
cat audit/event.go && \
printf '\\n--- summary ---\\n' && \
cat audit/summary.go && \
printf '\\n--- sink ---\\n' && \
cat audit/sink.go && \
printf '\\n--- fanout ---\\n' && \
cat audit/fanout.go && \
printf '\\n--- transaction ---\\n' && \
cat audit/transaction.go && \
printf '\\n--- git ---\\n' && \
git status --short"
semedit/semantic_lookup (✓ ✗): read Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-default_task-11-mixed-sink-api-migration_1790518256069894000/audit: read /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-default_task-11-mixed-sink-api-migration_1790518256069894000/audit: is a directory
{
  "file": "audit",
  "language": "go",
  "symbol": "Record"
}
4✓ ✓
/bin/zsh -lc "cat service/dispatch.go && \
printf '\\n--- replay ---\\n' && \
cat service/replay.go && \
printf '\\n--- dispatch tests (read only) ---\\n' && \
cat service/dispatch_test.go && \
printf '\\n--- module ---\\n' && \
cat go.mod"
✓ ✓
/bin/zsh -lc 'rg --files'
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
6✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '1,25p' service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
8—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Dispatcher"
}
9—semedit/semantic_batch (✓ ✗): { "status": "error", "results": [ { "tool": "semantic_insert_function", "status": "ok" }, { "tool": "semantic_replace_body", "status": "error", "error": "replace_body Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-default_task-11-mixed-sink-api-migration_1790518256069894000/service/dispatch.go: symbol not found" } ], "final_diff": "--- a/audit/normalize.go\n+++ b/audit/normalize.go\n // Package audit leaves room for normalization rules owned by the delivery b
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "auto_organize_imports": true,
        "file": "audit/normalize.go",
        "placement": "file_end",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
10—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "language": "go",
  "symbol": "NormalizeKind"
}
11—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
12—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
13—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
14—✓ ✓
/bin/zsh -lc 'rg --files docs'
15—✓ ✓
/bin/zsh -lc 'mkdir -p docs && \
tmp=$(mktemp docs/.SUBOPTIMAL_TOOLS.XXXXXX) && \
cat > "$tmp" <<'"'EOF'
# Suboptimal Tool Behavior

This log records semantic tooling failures that required recovery so future changes can account for backend limitations.

- Tool: "'`semantic_replace_body`
- Target: `service/dispatch.go`
- Observed failure: the tool could not resolve `Record` without the receiver-qualified name, despite semantic lookup identifying `Dispatcher.Record`.
- Workaround: retried with `(*Dispatcher).Record`; the replacement succeeded.
- Root cause: the body replacement resolver requires receiver qualification for this method in the current workspace.
EOF
sync "$tmp" && \
mv "$tmp" docs/SUBOPTIMAL_TOOLS.md'
16—semedit/semantic_organize_imports (✓ ✓)
{
  "add": [
    "strings"
  ],
  "file": "audit/normalize.go"
}
17—? ✗
/bin/zsh -lc 'make check'
18—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff --'
19—✓ ✓
/bin/zsh -lc 'go test ./...'
20—✓ ✓
/bin/zsh -lc 'git rev-parse --show-toplevel && \
git status --short -- audit service docs go.mod go.sum && \
git check-ignore -v audit/normalize.go service/dispatch.go docs/SUBOPTIMAL_TOOLS.md'
21—✓ ✓
/bin/zsh -lc 'git diff --no-index /dev/null audit/normalize.go; git status --short -- audit service go.mod go.sum'
22—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
23—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service"
}

default prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency38.74s62.55s+61.5%36.99s80.72s+118.2%
Process Start → First Event0.13s0.24s—0.13s0.13s—
First Event → First Tool Call5.47s5.16s—5.31s8.17s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles810+25.0%616+166.7%
Initial Load / Discovery Turns220%23+50.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)810+25.0%616+166.7%
Output Tokens10711187+10.8%10661251+17.4%
Reasoning / Thinking Tokens290384+32.4%97284+192.8%
Total Input Tokens141245273821+93.9%140329425856+203.5%
Cached Input Tokens128256252160+96.6%126208391936+210.5%
Uncached Input Tokens1298921661+66.8%1412133920+140.2%
Cost0.08150.1368+67.8%0.08140.2020+148.1%
Cached vs Uncached Token Ratio9.87:111.64:1+17.9%8.94:111.55:1+29.3%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'go.mod' -g 'audit/**' -g 'AGENTS.md' -g 'AGENTS.override.md'"
2✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go'
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/sink.go && \
cat audit/event.go && \
cat go.mod'
3✓ ✓
/bin/zsh -lc "rg -n \"Dispatcher|probe|health|Record\\(\""
✓ ✓
/bin/zsh -lc "rg --files && \
rg -n 'Dispatcher|Record|health|probe|control' --glob '*.go'"
4✓ ✓
/bin/zsh -lc 'git status --short && \
rg --files'
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go'
5✓ ✓
/bin/zsh -lc "cat go.mod && \
find . -maxdepth 2 -type f -name 'Makefile' -o -name 'go.work'"
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
6✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
cat docs/audit-sinks.md'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
7✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --check -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8✓ ✓
/bin/zsh -lc 'cat audit/normalize.go audit/summary.go service/dispatch.go; git diff --check; git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
9—✓ ✓
/bin/zsh -lc 'go test ./... && \
git status --short && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum metrics/writer.go legacy/export.go'
10—✓ ✓
/bin/zsh -lc 'git status --short -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum && \
cat audit/normalize.go'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' -g '"'!go.mod'"' -g '"'!go.sum'"'"
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'audit/*.go' -g 'AGENTS.md' -g 'Makefile'"
2✓ ✓
/bin/zsh -lc "git status --short && \
sed -n '1,240p' audit/normalize.go && \
sed -n '1,260p' audit/event.go && \
sed -n '1,220p' audit/fanout.go && \
rg -n \"Record\\(|probe|health|control\" audit"
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat audit/fanout.go'
3✓ ✓
/bin/zsh -lc "rg --files | sort | head -100 && \
rg -n \"type Dispatcher|func .*Record|Classify\\(\" . -g '*.go' -g '"'!**/*_test.go'"'"
✓ ✓
/bin/zsh -lc 'rg --files'
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go audit/summary.go audit/sink.go && \
cat AGENTS.override.md'
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "path": "service"
}
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

updates = {
    Path('audit/normalize.go'): '''// Package audit owns normalization at the event delivery boundary.
package audit

import \"strings\"

func NormalizeKind(kind string) string {
	return strings.ToLower(strings.TrimSpace(kind))
}
''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.
package audit

func Classify(kind string) string {
	switch NormalizeKind(kind) {
	case \"health\", \"probe\":
		return \"control\"
	default:
		return \"data\"
	}
}
''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.
package service

import \"example.com/auditapp/audit\"

type Dispatcher struct {
	sink audit.Sink
}

func NewDispatcher(sink audit.Sink) *Dispatcher {
	return &Dispatcher{sink: sink}
}

func (d *Dispatcher) Record(event audit.Event) error {
	event.Kind = audit.NormalizeKind(event.Kind)
	return d.sink.Write(event)
}

func DispatchAll(sink audit.Sink, events []audit.Event) error {
	writeEvent := audit.Sink.Write
	for _, event := range events {
		if err := writeEvent(sink, event); err "'!= nil {
			return err
		}
	}
	return nil
}
'"'''
}
for path, content in updates.items():
    fd, tmp = tempfile.mkstemp(dir=path.parent, prefix=f'.{path.name}.')
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(tmp, path)
    finally:
        if os.path.exists(tmp): os.unlink(tmp)
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
go test ./..."
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "path": "audit"
}
6✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
rg -n "probe|NormalizeKind" audit service metrics legacy'
✓ ✓
/bin/zsh -lc 'cat Makefile 2>/dev/null || \
true; cat audit/summary.go'
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
9—semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
10—semedit/semantic_organize_imports (✓ ✓)
{
  "add": [
    "strings"
  ],
  "file": "audit/normalize.go"
}
11—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
12—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
13—? ✗
/bin/zsh -lc 'make check'
14—✓ ✓
/bin/zsh -lc 'git diff -- go.mod go.sum && \
git status --short'
15—semedit/semantic_verify (✓ ✓)
{
  "path": "."
}
16—✓ ✓
/bin/zsh -lc 'go test ./...'

default prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency25.06s49.82s+98.8%50.71s71.70s+41.4%
Process Start → First Event0.12s0.13s—0.14s0.12s—
First Event → First Tool Call4.44s6.53s—6.05s6.30s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles512+140.0%712+71.4%
Initial Load / Discovery Turns12+100.0%21-50.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)512+140.0%712+71.4%
Output Tokens623745+19.6%13111410+7.6%
Reasoning / Thinking Tokens00—470450-4.3%
Total Input Tokens137259287755+109.6%183989192719+4.7%
Cached Input Tokens125184252928+102.0%168704169216+0.3%
Uncached Input Tokens1207534827+188.4%1528523503+53.8%
Cost0.06930.1596+130.4%0.10270.1243+21.1%
Cached vs Uncached Token Ratio10.37:17.26:1-29.9%11.04:17.20:1-34.8%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'audit/**' -g 'Makefile'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'go.mod' -g 'go.sum'"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat audit/summary.go && \
rg -n \"Dispatcher|Record\\(|health|probe|control|NormalizeKind\" --glob '"'!**/*_test.go'"'"
✓ ✓
/bin/zsh -lc 'cat PROJECT_BRIEF.md 2>/dev/null; cat audit/normalize.go; cat audit/sink.go'
3✓ ✓
/bin/zsh -lc "cat service/dispatch.go && \
rg --files -g 'README*' -g 'Makefile' -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'go.work'"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'rg --files'
✓ ✓
/bin/zsh -lc 'rg --files'
5✓ ✓
/bin/zsh -lc 'git diff --check && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "."
}
6—semedit/semantic_insert_function (✓ ✓)
{
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
8—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
9—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—? ✗
/bin/zsh -lc 'make check'
12—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- go.mod go.sum'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' -g 'AGENTS.override.md' -g 'AGENTS.md'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'README*' -g 'go.mod' -g 'audit/**' | sort"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
rg -n \"func \\(.*Record|Record\\(|probe|health|Kind\" audit"
✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/event.go && \
cat audit/fanout.go && \
rg -n 'Dispatcher|Record|probe|health' --glob '*.go'"
3✓ ✓
/bin/zsh -lc 'rg -n "Dispatcher|Record|persist|Persist|Classify|probe|legacy|metrics" .'
semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
4? ✗
/bin/zsh -lc 'cat service/dispatch.go audit/summary.go audit/event.go audit/sink.go docs/audit-sinks.md Makefile go.mod'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g '*.go' -g 'go.work' -g 'go.mod' | sort && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short"
? ✗
/bin/zsh -lc "rg -n '"'^(check|fmt|test):|''^'"\\.PHONY' Makefile"
6✓ ✓
/bin/zsh -lc 'git rev-parse --show-toplevel && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go && \
git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go || \
true && \
cat audit/normalize.go'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
7✓ ✓
/bin/zsh -lc 'gofmt -d audit/normalize.go audit/summary.go service/dispatch.go && \
go test -mod=readonly ./...'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
8—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "auto_organize_imports": true,
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "auto_organize_imports": false,
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
9—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- go.mod go.sum'
10—✓ ✓
/bin/zsh -lc 'go test ./...'
11—semedit/semantic_verify (✗ ?): This action was rejected due to unacceptable risk. Reason: Go verification over path "." may write formatting changes across the workspace, including forbidden test files; a narrower source-only verification is needed. Do not bypass this rejection through a workaround or indirect execution. Continue with a safer alternative, or carry out checks to prove that the action is authorized or low risk before trying again. Complete unaffected work without asking for confirmation. Report anything that remains blocke
{
  "language": "go",
  "path": "."
}
12—? ✗
/bin/zsh -lc 'git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --no-index /dev/null audit/normalize.go; git diff --no-index /dev/null audit/summary.go; git diff --no-index /dev/null service/dispatch.go'

default prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency36.35s64.52s+77.5%46.85s82.96s+77.1%
Process Start → First Event0.11s0.12s—0.12s0.13s—
First Event → First Tool Call4.80s6.75s—5.78s6.81s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles515+200.0%614+133.3%
Initial Load / Discovery Turns220%12+100.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)515+200.0%614+133.3%
Output Tokens11041461+32.3%12191672+37.2%
Reasoning / Thinking Tokens313307-1.9%434686+58.1%
Total Input Tokens139589278277+99.4%163145397620+143.7%
Cached Input Tokens126208250624+98.6%148480358656+141.6%
Uncached Input Tokens1338127653+106.7%1466538964+165.7%
Cost0.08270.1539+86.0%0.09440.2165+129.3%
Cached vs Uncached Token Ratio9.43:19.06:1-3.9%10.12:19.20:1-9.1%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS*.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'tools/benchmark-harness/README.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g '*.go' | head -80"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
sed -n '1,240p' audit/normalize.go && \
sed -n '1,280p' audit/event.go && \
sed -n '1,260p' audit/sink.go && \
rg -n \"Record\\(|health|probe|control\" --glob '*.go'"
? ✗
/bin/zsh -lc 'cat tools/benchmark-harness/README.md && \
cat PROJECT_BRIEF.md'
3✓ ✓
/bin/zsh -lc "sed -n '1,200p' service/dispatch.go && \
sed -n '1,160p' audit/summary.go && \
cat go.mod"
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git status --short && \
git diff --check && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go'
semedit/semantic_outline (✓ ✓)
{
  "path": "service/dispatch.go"
}
5✓ ✓
/bin/zsh -lc "sed -n '1,60p' audit/normalize.go && \
sed -n '1,50p' audit/summary.go && \
sed -n '10,26p' service/dispatch.go && \
git diff --check -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
6—✓ ✓
/bin/zsh -lc 'rg --files | sort'
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
8—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "auto_organize_imports": false,
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "auto_organize_imports": false,
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—? ✗
/bin/zsh -lc 'make check'
12—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff --check && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum'
13—✓ ✓
/bin/zsh -lc 'go test ./...'
14—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/summary.go'
15—✓ ✓
/bin/zsh -lc 'git check-ignore -v audit/normalize.go service/dispatch.go audit/summary.go; git rev-parse --show-toplevel; git status --short --untracked-files=all -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'Makefile' -g 'go.mod' -g '"'!**/*_test.go'"' | head -80 && \
git status --short"
2✓ ✓
/bin/zsh -lc "sed -n '1,240p' audit/normalize.go && \
sed -n '1,260p' audit/event.go && \
sed -n '1,240p' audit/fanout.go && \
rg -n \"Dispatcher|Record\\(|health|probe|control\" . --glob '"'!AGENTS.override.md'"'"
✓ ✓
/bin/zsh -lc 'rg --files | head -100 && \
cat AGENTS.override.md && \
cat go.mod'
3✓ ✓
/bin/zsh -lc "sed -n '1,200p' service/dispatch.go && \
sed -n '1,160p' audit/summary.go && \
rg --files | sort | head -100 && \
git status --short"
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc 'git status --short -- audit/normalize.go audit/summary.go service/dispatch.go audit/event_test.go audit/summary_test.go service/dispatch_test.go go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go'
semedit/semantic_lookup (✓ ✗): resolve NormalizeKind: symbol not found
{
  "symbol": "NormalizeKind"
}
6✓ ✓
/bin/zsh -lc "sed -n '1,80p' audit/normalize.go && \
sed -n '10,25p' service/dispatch.go && \
sed -n '1,25p' audit/summary.go && \
git rev-parse --show-toplevel && \
git status --short"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "auto_organize_imports": true,
        "file": "audit/normalize.go",
        "placement": "file_end",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "auto_organize_imports": false,
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "auto_organize_imports": false,
        "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
9—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
10—✓ ✓
/bin/zsh -lc 'go test ./... && \
git status --short -- go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go'
11—? ✗
/bin/zsh -lc 'git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff -- audit/summary.go service/dispatch.go && \
git ls-files --error-unmatch audit/normalize.go'
12—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
13—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
14—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}

default prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency100.91s68.15s-32.5%42.87s84.03s+96.0%
Process Start → First Event0.12s0.12s—0.13s0.13s—
First Event → First Tool Call17.25s4.72s—4.49s6.33s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles511+120.0%815+87.5%
Initial Load / Discovery Turns110%220%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)511+120.0%815+87.5%
Output Tokens9961494+50.0%13491329-1.5%
Reasoning / Thinking Tokens329335+1.8%462381-17.5%
Total Input Tokens139918356392+154.7%205027245064+19.5%
Cached Input Tokens127232332288+161.2%189952204032+7.4%
Uncached Input Tokens1268624104+90.0%1507541032+172.2%
Cost0.08010.1662+107.5%0.10780.1750+62.3%
Cached vs Uncached Token Ratio10.03:113.79:1+37.5%12.60:14.97:1-60.5%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' -g '"'!go.mod'"' -g '"'!go.sum'"'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README*' -g 'AGENTS*' -g '*.go' -g 'go.mod' -g 'go.sum' | head -100"
2✓ ✓
/bin/zsh -lc "git status --short && \
cat audit/normalize.go && \
sed -n '1,240p' audit/event.go && \
sed -n '1,260p' audit/sink.go && \
rg -n \"Dispatcher|probe|health|Record\\(\" . -g '*.go' -g 'Makefile' -g '*.md'"
✓ ✓
/bin/zsh -lc 'cat AGENTS.override.md && \
cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go'
3? ✗
/bin/zsh -lc "cat service/dispatch.go && \
cat audit/summary.go && \
rg --files -g 'Makefile' -g 'README.md'"
semedit/semantic_insert_function (✓ ✓)
{
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
4✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'go.mod' -g 'go.sum' -g 'README*' -g 'AGENTS.md' && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go"
semedit/semantic_organize_imports (✓ ✓)
{
  "add": [
    "strings"
  ],
  "file": "audit/normalize.go"
}
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go service/dispatch.go audit/summary.go && \
go test ./... && \
git diff --check && \
git status --short'
✓ ✓
/bin/zsh -lc "rg -n 'health|probe|control|Record\\(' --glob '*.go'"
6—✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat audit/normalize.go'
7—semedit/semantic_replace_body (✓ ✗): replace_body Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790515922651390000/service/dispatch.go: symbol not found
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "Record"
}
8—✓ ✓
/bin/zsh -lc 'rg --files'
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—✓ ✓
/bin/zsh -lc "python3 -c 'import os,tempfile; p=\"docs/SUBOPTIMAL_TOOLS.md\"; old=open(p).read() if os.path.exists(p) else \"# Suboptimal Tool Behavior\\n\"; entry=\"\\n- Tool: "'`semantic_replace_body`; target: `service/dispatch.go`; observed failure: symbol `Record` was not found because the receiver method requires `(*Dispatcher).Record`; workaround: retried with the receiver-qualified symbol and it succeeded; root cause: method lookup requires receiver qualification.'"\\n\"; fd,tmp=tempfile.mkstemp(dir=\"docs\",prefix=\".SUBOPTIMAL_TOOLS.\"); f=os.fdopen(fd,\"w\"); f.write(old+entry); f.flush(); os.fsync(f.fileno()); f.close(); os.replace(tmp,p); d=os.open(\"docs\",os.O_RDONLY); os.fsync(d); os.close(d)' && \
go test ./... && \
git status --short && \
git diff -- go.mod go.sum && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go docs/SUBOPTIMAL_TOOLS.md"
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'go.mod' -g 'go.sum' -g 'Makefile'"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
sed -n '1,240p' audit/event.go && \
sed -n '1,240p' audit/fanout.go && \
git status --short && \
rg -n 'Record\\(|probe|health|control' audit"
? ✗
/bin/zsh -lc "sed -n '1,180p' audit/normalize.go && \
rg -n 'health|probe|Record|make check' audit Makefile"
3✓ ✓
/bin/zsh -lc "rg -n 'type Dispatcher|func \\(.*Dispatcher.*Record|Dispatcher|Classify|Persist|Write\\('"
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
4? ✗
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
cat Makefile && \
cat AGENTS.override.md'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g '*.go' -g 'go.mod' | sort | head -80"
semedit/semantic_lookup (✓ ✗): resolve NormalizeKind: symbol not found
{
  "symbol": "NormalizeKind"
}
6✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
7✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/*_test.go service/*_test.go metrics/*_test.go legacy/*_test.go'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
8? ✗
/bin/zsh -lc 'git status --short | head -60 && \
git diff --no-index /dev/null audit/normalize.go && \
git ls-files audit/normalize.go service/dispatch.go audit/summary.go'
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
go test ./...'
12—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "language": "go",
  "symbol": "NormalizeKind"
}
13—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
14—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
15—✓ ✓
/bin/zsh -lc 'git rev-parse --show-toplevel && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff -- go.mod go.sum'

default prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency49.38s53.54s+8.4%44.58s124.23s+178.7%
Process Start → First Event0.13s0.12s—0.13s0.13s—
First Event → First Tool Call4.47s6.73s—4.78s6.64s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles811+37.5%719+171.4%
Initial Load / Discovery Turns23+50.0%12+100.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)811+37.5%719+171.4%
Output Tokens17241105-35.9%14392686+86.7%
Reasoning / Thinking Tokens377145-61.5%3181211+280.8%
Total Input Tokens183506347366+89.3%163924389090+137.4%
Cached Input Tokens167680322304+92.2%148480357888+141.0%
Uncached Input Tokens1582625062+58.4%1544431202+102.0%
Cost0.10770.1589+47.4%0.09770.2162+121.3%
Cached vs Uncached Token Ratio10.60:112.86:1+21.4%9.61:111.47:1+19.3%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'audit/**' -g 'Makefile' | sort"
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'audit/*.go' -g 'AGENTS.md' -g 'AGENTS.override.md' -g '"'!**/*_test.go'"'"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
rg -n \"health|probe|Record\\(\" audit"
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go audit/event.go audit/sink.go audit/summary.go'
3✓ ✓
/bin/zsh -lc "cat audit/summary.go && \
rg -n \"type Dispatcher|func \\(.*Dispatcher|Record|legacy|metrics\" . -g '*.go' -g 'README*'"
✓ ✓
/bin/zsh -lc "rg --files -g '*.go' -g '"'!**/*_test.go'"' | sort"
4✓ ✓
/bin/zsh -lc "cat service/dispatch.go && \
cat audit/summary_test.go && \
cat service/dispatch_test.go && \
rg --files -g 'Makefile' -g 'PROJECT_BRIEF.md' -g 'README*' | head -30"
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "path": "service"
}
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile, time
root = Path('.')
updates = {
    'audit/normalize.go': '''// Package audit owns normalization rules at the delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    'service/dispatch.go': '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
    'audit/summary.go': '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
}
for name, content in updates.items():
    path = root / name
    fd, tmp = tempfile.mkstemp(prefix=path.name + '.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        old = path.stat().st_mtime_ns
        os.replace(tmp, path)
        now = time.time_ns()
        os.utime(path, ns=(now, max(now, old + 1_000_000)))
    finally:
        if os.path.exists(tmp):
            os.unlink(tmp)
PY

git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short"
semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
6✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
git rev-parse --show-toplevel && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go && \
git ls-files audit/normalize.go service/dispatch.go'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
7? ✗
/bin/zsh -lc 'before=$(shasum go.mod go.sum) && \
GOFLAGS=-mod=readonly go test ./... && \
after=$(shasum go.mod go.sum) && \
test "$before" = "$after" && \
git diff --check -- audit/normalize.go audit/summary.go service/dispatch.go && \
printf '"'%s\\n' 'module metadata unchanged' 'diff whitespace check passed'"
semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8✓ ✓
/bin/zsh -lc 'before=$(shasum go.mod) && \
test ! -e go.sum && \
GOFLAGS=-mod=readonly go test ./... && \
after=$(shasum go.mod) && \
test "$before" = "$after" && \
test ! -e go.sum && \
git diff --check -- audit/normalize.go audit/summary.go service/dispatch.go && \
printf '"'%s\\n' 'go.mod unchanged; go.sum remains absent' 'diff whitespace check passed'"
✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short && \
git diff -- go.mod go.sum'
9—✓ ✓
/bin/zsh -lc 'pwd; cat audit/normalize.go; cat service/dispatch.go; cat audit/summary.go; git status --short -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum'
10—? ✗
/bin/zsh -lc "rg --files -g 'Makefile' -g 'go.mod' -g 'README*' -g 'PROJECT_BRIEF.md' -g 'AGENTS*' | sort; cat go.mod; git diff --no-index /dev/null audit/normalize.go"
11—✓ ✓
/bin/zsh -lc 'go test ./...'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'go.sum' -g 'audit/**' -g 'Makefile' | sort"
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile' -g 'README*'"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
sed -n '1,240p' audit/event.go && \
sed -n '1,240p' audit/fanout.go && \
rg -n 'Dispatcher|probe|health|Record\\(' --glob '*.go' --glob 'README*' ."
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat AGENTS.override.md'
3? ✗
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
cat Makefile && \
cat go.mod'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Record"
}
4✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile
updates = {
'audit/normalize.go': '''// Package audit defines normalization for event kinds at the delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
'audit/summary.go': '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
'service/dispatch.go': '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n'''
}
for name, content in updates.items():
    path = Path(name)
    fd, temp = tempfile.mkstemp(dir=path.parent, prefix=path.name + '.')
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(temp, path)
    finally:
        if os.path.exists(temp):
            os.unlink(temp)
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go"
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher"
}
5? ✗
/bin/zsh -lc "git status --short -- audit service go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
rg --files -g 'Makefile' -g 'README*' -g 'AGENTS.md' -g 'PROJECT_BRIEF.md'"
✓ ✓
/bin/zsh -lc "cat service/dispatch.go && \
cat audit/event.go && \
rg -n 'probe|health|control|Kind' --glob '*.go' --glob '"'!**/*_test.go'"'"
6✓ ✓
/bin/zsh -lc 'git rev-parse --show-toplevel && \
git status --short && \
git check-ignore -v audit/normalize.go service/dispatch.go && \
cat audit/normalize.go && \
cat service/dispatch.go'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
7✓ ✓
/bin/zsh -lc 'go test ./...'
✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat go.mod'
8—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✗): replace_body Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-default_task-11-mixed-sink-api-migration_1790518577767135000/service/dispatch.go: symbol not found
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "Record"
}
10—✓ ✓
/bin/zsh -lc 'rg --files docs | sort && \
cat audit/normalize.go'
11—semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
12—✓ ✓
/bin/zsh -lc "python3 -c 'import os,time,tempfile; p=\"docs/SUBOPTIMAL_TOOLS.md\"; d=os.path.dirname(p); s=\"## semantic_replace_body\\n\\n- Target: "'`service/dispatch.go` (`Dispatcher.Record`).'"\\n- Failure: lookup using "'`Record` did not resolve the existing method; the tool returned `symbol not found`.'"\\n- Workaround: retry with the receiver-qualified symbol "'`(*Dispatcher).Record`.'"\\n- Root cause: the method selector requires receiver qualification in this invocation.\\n\"; fd,t=tempfile.mkstemp(dir=d,prefix=\".SUBOPTIMAL_TOOLS.\"); f=os.fdopen(fd,\"w\"); f.write(s); f.flush(); os.fsync(f.fileno()); f.close(); os.replace(t,p); now=time.time_ns(); os.utime(p,ns=(now,now))'"
13—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
14—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
15—✓ ✓
/bin/zsh -lc "git status --short && \
git diff -- go.mod go.sum && \
git diff -- '*_test.go' && \
git diff --"
16—✓ ✓
/bin/zsh -lc 'go test ./...'
17—semedit/semantic_verify (✓ ✓)
{
  "language": "go"
}
18—✓ ✓
/bin/zsh -lc 'pwd && \
git status --short -- audit/normalize.go service/dispatch.go audit/summary.go docs/SUBOPTIMAL_TOOLS.md go.mod go.sum && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go && \
git diff -- docs/SUBOPTIMAL_TOOLS.md | tail -n 20'
19—✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '1,24p' service/dispatch.go && \
find docs -maxdepth 1 -type f -print && \
cat docs/SUBOPTIMAL_TOOLS.md"

default prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency39.31s63.00s+60.3%47.49s84.92s+78.8%
Process Start → First Event0.12s0.12s—0.14s0.50s—
First Event → First Tool Call6.03s4.54s—5.54s7.12s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles611+83.3%812+50.0%
Initial Load / Discovery Turns21-50.0%23+50.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)611+83.3%812+50.0%
Output Tokens11271197+6.2%15051285-14.6%
Reasoning / Thinking Tokens0317—347382+10.1%
Total Input Tokens161840270720+67.3%184967276292+49.4%
Cached Input Tokens147456247040+67.5%161536244736+51.5%
Uncached Input Tokens1438423680+64.6%2343131556+34.7%
Cost0.08690.1399+61.0%0.12210.1609+31.8%
Cached vs Uncached Token Ratio10.25:110.43:1+1.8%6.89:17.76:1+12.5%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum' | sort && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'README*' -g '*.go' -g 'go.mod' -g 'go.sum' | head -100"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
rg -n \"Record\\(|health|probe|control\" . -g '*.go' -g 'Makefile'"
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat go.mod'
3? ✗
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
cat metrics/writer.go && \
cat Makefile'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "metrics/writer.go",
  "symbol": "Writer"
}
4✓ ✓
/bin/zsh -lc ''
semedit/semantic_outline (✓ ✓)
{
  "language": "go",
  "path": "metrics/writer.go"
}
5✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g '*.go' | sort && \
rg -n \"func Classify|func \\(.*Record\" ."
✓ ✓
/bin/zsh -lc "cat metrics/writer.go && \
rg -n \"probe|health|Classify|Record\" --glob '"'!**/*_test.go'"' ."
6✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git status --short'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
7—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "file": "audit/normalize.go",
        "placement": "file_end",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
8—✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'makefile' -g 'Taskfile*' -g 'README*' -g 'AGENTS*' && \
git diff -- go.mod go.sum && \
git status --short"
9—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go metrics/writer.go legacy/export.go go.mod go.sum'
10—✓ ✓
/bin/zsh -lc 'go test ./...'
11—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'Makefile' -g 'audit/**' -g 'docs/adr/README.md' | sort"
2✓ ✓
/bin/zsh -lc 'rg --files | sort | head -120 && \
git status --short'
✓ ✓
/bin/zsh -lc 'rg --files | sort | head -120 && \
git status --short'
3✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat docs/audit-sinks.md && \
cat AGENTS.override.md'
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat AGENTS.override.md'
4✓ ✓
/bin/zsh -lc "rg -n -i 'health|probe|control|Dispatcher|Record\\(' . -g '"'!AGENTS.override.md'"' -g '"'!go.mod'"'"
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
5✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat service/dispatch_test.go && \
cat audit/summary_test.go'
semedit/semantic_outline (✓ ✓)
{
  "path": "service"
}
6✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile
updates = {
    'audit/normalize.go': '''// Package audit owns canonical event kind formatting at the delivery boundary.\\npackage audit\\n\\nimport (\\n\\t\"strings\"\\n)\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    'service/dispatch.go': '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
    'audit/summary.go': '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
}
for name, content in updates.items():
    path = Path(name)
    fd, temp_name = tempfile.mkstemp(dir=path.parent, prefix=path.name + '.')
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(temp_name, path)
    except BaseException:
        try: os.unlink(temp_name)
        except FileNotFoundError: pass
        raise
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
7✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
git rev-parse --show-toplevel && \
git status --short'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
8✓ ✓
/bin/zsh -lc 'go test ./...'
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—semedit/semantic_verify (✓ ✓)
{
  "language": "go"
}
12—✓ ✓
/bin/zsh -lc 'go test ./... && \
git diff --check && \
git diff -- go.mod go.sum && \
git status --short -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum'

default prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency37.63s136.66s+263.1%57.70s67.38s+16.8%
Process Start → First Event0.74s0.74s—0.13s0.13s—
First Event → First Tool Call4.75s5.77s—4.97s7.61s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles417+325.0%89+12.5%
Initial Load / Discovery Turns110%21-50.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)417+325.0%89+12.5%
Output Tokens12453153+153.3%16531423-13.9%
Reasoning / Thinking Tokens3921809+361.5%477440-7.8%
Total Input Tokens99434542656+445.7%182990372069+103.3%
Cached Input Tokens88832508672+472.6%167680337152+101.1%
Uncached Input Tokens1060233984+220.5%1531034917+128.1%
Cost0.06920.2742+296.3%0.10680.1949+82.4%
Cached vs Uncached Token Ratio8.38:114.97:1+78.6%10.95:19.66:1-11.8%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'go.sum' -g '*.go' -g 'Makefile' | head -200 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum'"
2✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/summary.go && \
cat go.mod && \
find .. -name AGENTS.md -print'
semedit/semantic_inspect_symbol (✓ ✗): read Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790515679910409000/audit: read /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790515679910409000/audit: is a directory
{
  "file": "audit",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
3✓ ✓
/bin/zsh -lc "cat > /tmp/update_task11.py <<'PY'
from pathlib import Path
import os, tempfile

changes = {
    Path('audit/normalize.go'): '''// Package audit owns normalization rules at the event delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n'''
}
for path, content in changes.items():
    fd, temp = tempfile.mkstemp(prefix=f'.{path.name}.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(temp, path)
    finally:
        if os.path.exists(temp):
            os.unlink(temp)
PY
python3 /tmp/update_task11.py
gofmt -w audit/normalize.go service/dispatch.go audit/summary.go
go test ./..."
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit go.mod go.sum service && \
git diff --check'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
5—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
6—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
7—? ✗
/bin/zsh -lc "rg --files -g 'SUBOPTIMAL_TOOLS.md' -g 'Makefile' -g 'README.md'"
8—✓ ✓
/bin/zsh -lc 'rg --files'
9—✓ ✓
/bin/zsh -lc "python3 -c 'import os,tempfile,pathlib; p=pathlib.Path(\"docs/SUBOPTIMAL_TOOLS.md\"); p.parent.mkdir(parents=True,exist_ok=True); old=p.read_text() if p.exists() else \"# Suboptimal Tool Behavior\\n\\n\"; entry=\"- Tool: "'`semantic_inspect_symbol`'"\\n  Target: "'`audit` (directory scope supplied where a source file was required)'"\\n  Observed failure: The inspection rejected "'`audit` as a directory.'"\\n  Workaround: Located "'`Dispatcher.Record` with `semantic_lookup`, then inspected it with the concrete file path.'"\\n  Root cause: The tool requires a selected source file for symbol inspection.\\n\"; data=old+entry; fd,tmp=tempfile.mkstemp(dir=str(p.parent),prefix=\".SUBOPTIMAL_TOOLS.\"); f=os.fdopen(fd,\"w\"); f.write(data); f.flush(); os.fsync(f.fileno()); f.close(); os.replace(tmp,p); d=os.open(str(p.parent),os.O_RDONLY); os.fsync(d); os.close(d)'"
10—✓ ✓
/bin/zsh -lc "sed -n '1,120p' docs/audit-sinks.md && \
sed -n '1,80p' audit/normalize.go && \
sed -n '1,80p' audit/summary.go"
11—? ✗
/bin/zsh -lc 'make check'
12—semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
13—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
14—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
15—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
16—✓ ✓
/bin/zsh -lc 'go test ./...'
17—✓ ✓
/bin/zsh -lc "git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go docs/SUBOPTIMAL_TOOLS.md go.mod go.sum && \
git diff --name-only -- '*_test.go' go.mod go.sum"
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' -g '"'!go.mod'"' -g '"'!go.sum'"'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/*.go' -g 'Makefile' -g 'README*' | head -60"
2✓ ✓
/bin/zsh -lc "rg --files -g '"'!go.mod'"' -g '"'!go.sum'"'"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "language": "go",
  "path": "audit"
}
3✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat service/dispatch.go && \
cat audit/fanout.go && \
cat AGENTS.override.md'
✓ ✓
/bin/zsh -lc "rg --files | head -80 && \
rg -n 'type Dispatcher|func \\(.*Dispatcher.*Record|health|probe' --glob '*.go'"
4✓ ✓
/bin/zsh -lc "rg -n 'health|probe|control|Record\\(' --glob '"'!go.mod'"' --glob '"'!go.sum'"'"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
5? ✗
/bin/zsh -lc 'cat audit/summary.go && \
cat audit/sink.go && \
cat docs/audit-sinks.md && \
cat Makefile 2>/dev/null'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
6✓ ✓
/bin/zsh -lc "python3 - <<'PY'
import os, tempfile
from pathlib import Path

updates = {
    Path('audit/normalize.go'): '''// Package audit owns normalization rules at the event delivery boundary.\\npackage audit\\n\\nimport (\\n\\t\"strings\"\\n)\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
}
for path, content in updates.items():
    fd, temp = tempfile.mkstemp(prefix=f'.{path.name}.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(temp, path)
        os.utime(path, None)
    except BaseException:
        try: os.unlink(temp)
        except FileNotFoundError: pass
        raise
PY

git diff -- audit/normalize.go service/dispatch.go audit/summary.go && \
git status --short"
semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
7✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go service/dispatch.go audit/summary.go && \
go test ./...'
semedit/semantic_batch (✓ ✓)
{
  "edits": [
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
8✓ ✓
/bin/zsh -lc "git status --short -- . && \
git diff -- . -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum && \
git check-ignore -v audit/normalize.go service/dispatch.go audit/summary.go 2>/dev/null || \
true && \
cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '1,28p' service/dispatch.go"
✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
9—✓ ✓
/bin/zsh -lc "sed -n '1,80p' audit/normalize.go && \
sed -n '1,50p' audit/summary.go && \
sed -n '1,45p' service/dispatch.go && \
git rev-parse --show-toplevel"

default prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency94.77s88.63s-6.5%34.78s71.88s+106.7%
Process Start → First Event0.14s0.12s—0.13s0.14s—
First Event → First Tool Call6.02s6.20s—4.62s9.21s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles1116+45.5%410+150.0%
Initial Load / Discovery Turns220%21-50.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)1116+45.5%410+150.0%
Output Tokens16251891+16.4%9061271+40.3%
Reasoning / Thinking Tokens423512+21.0%273393+44.0%
Total Input Tokens144065349042+142.3%120508250782+108.1%
Cached Input Tokens122112323328+164.8%108032231680+114.5%
Uncached Input Tokens2195325714+17.1%1247619102+53.1%
Cost0.11100.1752+57.8%0.07290.1265+73.4%
Cached vs Uncached Token Ratio5.56:112.57:1+126.1%8.66:112.13:1+40.1%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS*.md' -g 'go.mod' -g 'go.sum' -g 'audit/**' -g 'README*' | sort"
2✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go'
✓ ✓
/bin/zsh -lc 'cat AGENTS.override.md && \
cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go'
3✓ ✓
/bin/zsh -lc "rg -n \"Dispatcher|health|probe|Record\\(\" --glob '*.go' ."
✓ ✓
/bin/zsh -lc "rg --files | sort && \
rg -n 'Dispatcher|probe|health|control|Record\\(' --glob '"'!**/*_test.go'"' ."
4✓ ✓
/bin/zsh -lc "git status --short && \
rg --files -g 'Makefile' -g 'PROJECT_BRIEF.md' -g 'README*' | head -60"
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go audit/summary.go docs/audit-sinks.md'
5✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Classify"
}
6✓ ✓
/bin/zsh -lc "ls -la && \
find . -maxdepth 2 -type f \\( -name 'Makefile' -o -name 'PROJECT_BRIEF.md' -o -name 'README.md' \\) -print"
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Record"
}
7✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

updates = {
    Path('audit/normalize.go'): '''// Package audit leaves room for normalization rules owned by the delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    Path('service/dispatch.go'): None,
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
}
for path, content in updates.items():
    if content is None:
        content = path.read_text()
        old = 'func (d *Dispatcher) Record(event audit.Event) error {\\n\\treturn d.sink.Write(event)\\n}'
        new = 'func (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}'
        if old not in content:
            raise SystemExit(f'expected implementation not found in {path}')
        content = content.replace(old, new, 1)
    fd, temporary = tempfile.mkstemp(dir=path.parent, prefix=f'.{path.name}.')
    try:
        with os.fdopen(fd, 'w') as output:
            output.write(content)
            output.flush()
            os.fsync(output.fileno())
        os.replace(temporary, path)
    except BaseException:
        try: os.unlink(temporary)
        except FileNotFoundError: pass
        raise
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
semedit/semantic_lookup (✓ ✗): resolve NormalizeKind: symbol not found
{
  "symbol": "NormalizeKind"
}
8✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '10,23p' service/dispatch.go"
semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9? ✗
/bin/zsh -lc 'git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --no-index /dev/null audit/normalize.go'
semedit/semantic_replace_body (✓ ✗): replace_body Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790516276227048000/service/dispatch.go: symbol not found
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "Record"
}
10✓ ✓
/bin/zsh -lc 'go test ./...'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
11✓ ✓
/bin/zsh -lc 'git status --short --untracked-files=all && \
git check-ignore -v audit/summary.go service/dispatch.go audit/normalize.go || \
true'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
12—? ✗
/bin/zsh -lc "cat > /tmp/suboptimal-entry <<'EOF'
- Tool: "'`semantic_replace_body`
  Target: `service/dispatch.go`
  Observed failure: the tool could not resolve the method using the short symbol `Record`.
  Workaround: retried with the receiver-qualified symbol `(*Dispatcher).Record`, which succeeded.
  Root cause: method lookup requires receiver qualification in this workspace/tool resolution path.
EOF
if [ -f docs/SUBOPTIMAL_TOOLS.md ]; then cat /tmp/suboptimal-entry >> docs/SUBOPTIMAL_TOOLS.md; else mv /tmp/suboptimal-entry docs/SUBOPTIMAL_TOOLS.md; fi
rm -f /tmp/suboptimal-entry
make check'
13—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go docs/SUBOPTIMAL_TOOLS.md go.mod go.sum'
14—✓ ✓
/bin/zsh -lc 'go test ./...'
15—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
16—✓ ✓
/bin/zsh -lc "pwd -P; ls -ld docs; ls -l docs/SUBOPTIMAL_TOOLS.md; git diff --no-ext-diff -- audit/normalize.go audit/summary.go service/dispatch.go; git status --short -- go.mod go.sum audit/normalize.go audit/summary.go service/dispatch.go docs/SUBOPTIMAL_TOOLS.md; git diff --quiet -- go.mod go.sum; printf 'module_diff_exit=%s\\n' \""'$?"; rg --files audit service docs | sort'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' | sort && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'go.mod' -g 'go.sum' | sort"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md 2>/dev/null; cat audit/normalize.go; sed -n '1,240p' audit/event.go; rg -n \"Record\\(|health|probe|NormalizeKind\" --glob '*.go' ."
✓ ✓
/bin/zsh -lc "sed -n '1,240p' audit/normalize.go && \
sed -n '1,260p' audit/event.go && \
sed -n '1,260p' audit/fanout.go && \
rg -n \"Dispatcher|probe|health|Record\\(\" audit"
3✓ ✓
/bin/zsh -lc 'cat service/dispatch.go; cat audit/summary.go; cat audit/sink.go; cat audit/fanout.go; cat audit/transaction.go; cat Makefile 2>/dev/null; rg --files'
✓ ✓
/bin/zsh -lc "rg --files | sort && \
rg -n \"type Dispatcher|func \\(.*Dispatcher.*Record|Classify\" ."
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short'
? ✗
/bin/zsh -lc "sed -n '1,160p' service/dispatch.go && \
sed -n '1,120p' audit/summary.go && \
cat go.mod && \
rg --files -g 'Makefile' -g 'PROJECT_BRIEF.md'"
5—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
6—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
7—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
9—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --check'
10—✓ ✓
/bin/zsh -lc "sed -n '1,100p' audit/normalize.go && \
sed -n '1,80p' audit/summary.go && \
sed -n '1,45p' service/dispatch.go && \
git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go"

default prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency46.04s72.36s+57.2%38.95s52.80s+35.5%
Process Start → First Event0.12s0.12s—0.12s0.14s—
First Event → First Tool Call5.81s6.16s—4.84s4.89s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles513+160.0%79+28.6%
Initial Load / Discovery Turns110%110%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)513+160.0%79+28.6%
Output Tokens14061324-5.8%11751311+11.6%
Reasoning / Thinking Tokens356422+18.5%320390+21.9%
Total Input Tokens120118237330+97.6%183988291276+58.3%
Cached Input Tokens107008198912+85.9%158464264448+66.9%
Uncached Input Tokens1311038418+193.0%2552426828+5.1%
Cost0.08160.1676+105.5%0.12210.1544+26.5%
Cached vs Uncached Token Ratio8.16:15.18:1-36.6%6.21:19.86:1+58.8%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 6 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'go.mod' -g 'audit/**' | sort"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
sed -n '1,240p' audit/normalize.go && \
sed -n '1,260p' audit/event.go && \
sed -n '1,220p' audit/sink.go && \
rg -n \"Dispatcher|probe|health|Record\\(\" . -g '"'!go.mod'"' -g '"'!go.sum'"'"
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
3? ✗
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
cat go.mod 2>/dev/null | head -20 && \
rg -n "make check|go test|verified" README* Makefile'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
4✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

changes = {
    'audit/normalize.go': '''// Package audit leaves room for normalization rules owned by the delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    'service/dispatch.go': '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
    'audit/summary.go': '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
}
for name, content in changes.items():
    path = Path(name)
    fd, temp_name = tempfile.mkstemp(prefix=f'.{path.name}.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as temp:
            temp.write(content)
            temp.flush()
            os.fsync(temp.fileno())
        os.replace(temp_name, path)
    except BaseException:
        try:
            os.unlink(temp_name)
        except FileNotFoundError:
            pass
        raise
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
semedit/semantic_lookup (✓ ✗): resolve probe: symbol not found
{
  "symbol": "probe"
}
5✓ ✓
/bin/zsh -lc 'git rev-parse --show-toplevel && \
git status --short -- . && \
git diff --no-index /dev/null audit/normalize.go || \
true && \
go test ./...'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
6—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher"
}
8—? ✗
/bin/zsh -lc 'make check'
9—✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'README*' -g '*.go' -g 'go.mod' | sort && \
git status --short"
10—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string { return strings.ToLower(strings.TrimSpace(kind)) }"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
11—✓ ✓
/bin/zsh -lc 'go test ./...'
12—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
13—✓ ✓
/bin/zsh -lc 'git diff -- go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go audit/*_test.go'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'go.mod' -g 'go.sum' -g '*.go' | head -100"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g '*.go' -g 'Makefile' -g 'go.mod' -g 'go.sum' | head -100"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
rg -n \"probe|health|Record\\(\" . --glob '"'!**/*_test.go'"' && \
rg --files -g 'README.md' -g 'PROJECT_BRIEF.md' -g 'AGENTS*' -g 'Makefile'"
✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
cat PROJECT_BRIEF.md 2>/dev/null; sed -n '1,240p' audit/normalize.go; sed -n '1,260p' audit/event.go; sed -n '1,260p' service/dispatch.go"
3✓ ✓
/bin/zsh -lc 'cat audit/summary.go audit/sink.go audit/fanout.go metrics/writer.go legacy/export.go && \
cat AGENTS.override.md && \
cat go.mod'
✓ ✓
/bin/zsh -lc "sed -n '1,280p' audit/sink.go; sed -n '1,220p' audit/fanout.go; rg -n 'health|probe|control|Kind' . -g '*.go' -g '"'!**/*_test.go'"'"
4✓ ✓
/bin/zsh -lc 'rg -n "make check|go test|check" README.md Makefile .github 2>/dev/null || \
true && \
git status --short && \
cat audit/summary_test.go'
✓ ✓
/bin/zsh -lc 'cat audit/summary.go; cat metrics/writer.go; cat legacy/export.go'
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go service/dispatch.go audit/summary.go && \
go test ./...'
semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
6✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go && \
git diff -- go.mod go.sum'
semedit/semantic_batch (✓ ✓)
{
  "edits": [
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
7✓ ✓
/bin/zsh -lc 'git rev-parse --show-toplevel && \
git status --short --untracked-files=all -- audit/normalize.go service/dispatch.go audit/summary.go && \
cat audit/normalize.go audit/summary.go service/dispatch.go'
✓ ✓
/bin/zsh -lc 'go test ./...'
8—✓ ✓
/bin/zsh -lc "git status --short && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go && \
git diff --quiet -- go.mod go.sum; printf 'module_metadata_unchanged=%s\\n' \""'$?"; git diff --name-only -- '"'*_test.go'"
9—✓ ✓
/bin/zsh -lc "git rev-parse --show-toplevel; git status --short --untracked-files=all -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum; sed -n '1,40p' audit/normalize.go; sed -n '1,35p' audit/summary.go; sed -n '1,35p' service/dispatch.go; cat go.mod"

default prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency41.40s85.04s+105.4%47.65s50.42s+5.8%
Process Start → First Event0.12s0.13s—0.13s0.13s—
First Event → First Tool Call4.85s6.16s—5.49s7.28s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles613+116.7%611+83.3%
Initial Load / Discovery Turns10-100.0%110%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)613+116.7%611+83.3%
Output Tokens13761637+19.0%1283946-26.3%
Reasoning / Thinking Tokens448441-1.6%3760-100.0%
Total Input Tokens162668318322+95.7%139643260479+86.5%
Cached Input Tokens147456292608+98.4%127232238848+87.7%
Uncached Input Tokens1521225714+69.0%1241121631+74.3%
Cost0.09770.1634+67.3%0.08360.1256+50.3%
Cached vs Uncached Token Ratio9.69:111.38:1+17.4%10.25:111.04:1+7.7%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' | sort && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'Makefile' -g '*dispatcher*' -g '*audit*' -g 'go.mod' -g 'go.sum' -g 'README*'"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
rg -n \"Dispatcher|probe|health|Record\\(\" . -g '"'!**/*_test.go'"' && \
rg --files | sort | head -80"
✓ ✓
/bin/zsh -lc 'rg --files'
3✓ ✓
/bin/zsh -lc "cat service/dispatch.go audit/summary.go docs/audit-sinks.md && \
cat go.mod && \
find . -maxdepth 2 -type f -name 'Makefile' -o -name 'README.md'"
✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat audit/normalize.go && \
cat audit/event.go && \
cat service/dispatch.go && \
cat go.mod'
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
GOFLAGS=-mod=readonly go test ./...'
✓ ✓
/bin/zsh -lc "rg -n 'health|probe|control|Record\\('"
5✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
6? ✗
/bin/zsh -lc 'cat audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short --untracked-files=all -- . && \
git diff --no-index /dev/null audit/normalize.go'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
8—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
10—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
11—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- go.mod go.sum'
12—✓ ✓
/bin/zsh -lc 'go test ./...'
13—✓ ✓
/bin/zsh -lc "git status --short --untracked-files=all -- . && \
cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '1,24p' service/dispatch.go"
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'tools/benchmark-harness/README.md' -g 'audit/*.go' -g 'AGENTS.md' -g 'AGENTS.override.md'"
2✓ ✓
/bin/zsh -lc "rg --files | sort | head -100 && \
rg -n \"Dispatcher|Record\\(|health|probe|Kind\" audit"
✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
rg -n \"Dispatcher|Record\\(|probe|health|control\" audit --glob '"'!**/*_test.go'"' && \
git status --short"
3✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat docs/audit-sinks.md'
✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
cat audit/event.go && \
rg -n \"func .*Record|type Dispatcher|\\.Record\\(\" --glob '*.go' --glob '"'!**/*_test.go'"' ."
4✓ ✓
/bin/zsh -lc "cat > /tmp/audit-normalize.py <<'PY'
from pathlib import Path
import os, tempfile

root = Path.cwd()
updates = {
    root / 'audit/normalize.go': '''// Package audit normalizes event kinds at the persistence boundary.
package audit

import (
	\"strings\"
)

func NormalizeKind(kind string) string {
	return strings.ToLower(strings.TrimSpace(kind))
}
''',
    root / 'audit/summary.go': '''// Package audit groups normalized delivery kinds for operational reporting.
package audit

func Classify(kind string) string {
	switch NormalizeKind(kind) {
	case \"health\", \"probe\":
		return \"control\"
	default:
		return \"data\"
	}
}
''',
    root / 'service/dispatch.go': '''// Package service coordinates application work with the configured audit sink.
package service

import \"example.com/auditapp/audit\"

type Dispatcher struct {
	sink audit.Sink
}

func NewDispatcher(sink audit.Sink) *Dispatcher {
	return &Dispatcher{sink: sink}
}

func (d *Dispatcher) Record(event audit.Event) error {
	event.Kind = audit.NormalizeKind(event.Kind)
	return d.sink.Write(event)
}

func DispatchAll(sink audit.Sink, events []audit.Event) error {
	writeEvent := audit.Sink.Write
	for _, event := range events {
		if err := writeEvent(sink, event); err "'!= nil {
			return err
		}
	}
	return nil
}
'"''',
}
for path, content in updates.items():
    fd, tmp = tempfile.mkstemp(dir=path.parent, prefix=f'.{path.name}.')
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(tmp, path)
        os.utime(path, None)
    finally:
        if os.path.exists(tmp):
            os.unlink(tmp)
PY
python3 /tmp/audit-normalize.py
"
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/sink.go && \
cat go.mod'
5✓ ✓
/bin/zsh -lc 'cat go.mod && \
git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- go.mod go.sum'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
6✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
GOTOOLCHAIN=local GOPROXY=off go test ./...'
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
8—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
10—semedit/semantic_organize_imports (✓ ✓)
{
  "file": "audit/normalize.go"
}
11—? ✗
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
make check'

default prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency53.51s77.14s+44.2%52.56s112.20s+113.5%
Process Start → First Event0.12s0.12s—0.13s0.13s—
First Event → First Tool Call5.52s5.67s—5.56s6.13s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles1016+60.0%616+166.7%
Initial Load / Discovery Turns220%220%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)1016+60.0%616+166.7%
Output Tokens16371483-9.4%13291881+41.5%
Reasoning / Thinking Tokens509502-1.4%507900+77.5%
Total Input Tokens185359251647+35.8%165115357981+116.8%
Cached Input Tokens170752221184+29.5%150528321024+113.3%
Uncached Input Tokens1460730463+108.6%1458736957+153.4%
Cost0.10600.1563+47.4%0.09700.2074+113.7%
Cached vs Uncached Token Ratio11.69:17.26:1-37.9%10.32:18.69:1-15.8%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'go.sum' -g 'Makefile' -g 'audit/**' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum' | sort"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
sed -n '1,240p' audit/event.go && \
sed -n '1,240p' audit/sink.go"
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'README*' -g 'docs/**' -g 'Makefile' | sort && \
git status --short"
3✓ ✓
/bin/zsh -lc "rg -n \"Dispatcher|Record\\(|probe|health|control|NormalizeKind|export|metrics\" --glob '"'!go.sum'"' --glob '"'!go.mod'"' ."
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README*' | sort"
✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md'
5✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
cat AGENTS.override.md && \
cat docs/audit-sinks.md && \
cat .gitignore 2>/dev/null || \
true'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher"
}
6✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g '*.md' -g '*.yml' -g '*.yaml' -g '*.sh' | sort && \
cat go.mod"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
7✓ ✓
/bin/zsh -lc 'git diff --check && \
git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_inspect_symbol (✓ ✗): resolve NormalizeKind in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790516147968342000/audit/normalize.go: symbol not found
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
8✓ ✓
/bin/zsh -lc 'go test ./...'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
9✓ ✓
/bin/zsh -lc "gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --check -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
sed -n '1,80p' audit/normalize.go && \
sed -n '1,60p' audit/summary.go && \
sed -n '10,28p' service/dispatch.go && \
git diff -- go.mod go.sum"
semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "auto_organize_imports": true,
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
10✓ ✓
/bin/zsh -lc 'go test ./... && \
git diff --check -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/*_test.go && \
git status --short'
11—✓ ✓
/bin/zsh -lc 'go test ./...'
12—✓ ✓
/bin/zsh -lc 'git rev-parse --show-toplevel && \
git status --short --untracked-files=all -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit'
13—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
14—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
15—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
16—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'go.sum' -g 'Makefile' -g 'audit/**' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'README*' -g '*.go' | head -100"
2✓ ✓
/bin/zsh -lc "ls -la && \
cat AGENTS.override.md 2>/dev/null; cat PROJECT_BRIEF.md 2>/dev/null; sed -n '1,240p' audit/normalize.go; sed -n '1,260p' audit/event.go; rg -n \"Record\\(|probe|health|control|Kind\" audit"
✓ ✓
/bin/zsh -lc 'cat PROJECT_BRIEF.md 2>/dev/null; cat Makefile 2>/dev/null; git status --short'
3? ✗
/bin/zsh -lc "rg -n \"type Dispatcher|func \\(.*Dispatcher.*Record|Record\\(\" . -g '*.go'; cat audit/summary.go; cat audit/fanout.go; cat audit/sink.go; cat audit/transaction.go; cat Makefile 2>/dev/null"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc "cat service/dispatch.go; cat service/dispatch_test.go; cat go.mod; rg --files -g 'Makefile' -g '*.md' | sort"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- go.mod go.sum'
semedit/semantic_inspect_symbol (✓ ✗): param "symbol" is required: invalid operation parameters
{
  "file": "audit/normalize.go",
  "language": "go",
  "symbol": ""
}
6✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go; git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum; git rev-parse --show-toplevel; git diff --check -- audit/normalize.go audit/summary.go service/dispatch.go'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
7—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
8—semedit/semantic_batch (✓ ✗): { "status": "error", "results": [ { "tool": "semantic_replace_body", "symbol": "Classify", "status": "ok", "diff": "--- a/Classify\n+++ b/Classify\n-switch kind {\n-\tcase \"health\":\n-\t\treturn \"control\"\n-\tdefault:\n-\t\treturn \"data\"\n-\t}\n+switch NormalizeKind(kind) {\n+case \"health\", \"probe\":\n+\treturn \"control\"\n+default:\n+\treturn \"data\"\n+}\n" }, { "tool": "semantic_replace_body", "status": "error", "error": "replace_body Record in /Users/alessandro/sources/semantic-editor/.scratch
{
  "edits": [
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "Record"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
9—semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "path": "service/dispatch.go"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
11—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "language": "go",
  "symbol": "NormalizeKind"
}
12—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
13—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/summary.go"
}
14—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/normalize.go"
}
15—✓ ✓
/bin/zsh -lc 'go test ./...'
16—✓ ✓
/bin/zsh -lc "git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum 'audit/*_test.go' 'service/*_test.go' && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go"

default prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency59.58s172.98s+190.3%30.00s88.28s+194.2%
Process Start → First Event0.12s0.12s—0.13s0.14s—
First Event → First Tool Call7.52s21.43s—4.86s5.38s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles714+100.0%613+116.7%
Initial Load / Discovery Turns13+200.0%220%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)714+100.0%613+116.7%
Output Tokens18261798-1.5%7681697+121.0%
Reasoning / Thinking Tokens325461+41.8%0708—
Total Input Tokens165073236915+43.5%160328297031+85.3%
Cached Input Tokens149504215552+44.2%146432265728+81.5%
Uncached Input Tokens1556921363+37.2%1389631303+125.3%
Cost0.10320.1355+31.3%0.08090.1748+115.9%
Cached vs Uncached Token Ratio9.60:110.09:1+5.1%10.54:18.49:1-19.4%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'go.mod' -g 'audit/**' -g '*test.go' | head -200 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum'"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
sed -n '1,240p' service/dispatch.go && \
sed -n '1,200p' audit/event.go && \
rg -n \"Record\\(|probe|health|NormalizeKind\" . --glob '"'!**/*test.go'"'"
✓ ✓
/bin/zsh -lc 'rg --files'
3? ✗
/bin/zsh -lc "cat audit/summary.go && \
cat audit/sink.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
cat Makefile 2>/dev/null || \
true && \
rg --files -g 'README*' -g 'AGENTS.md'"
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/sink.go && \
cat audit/event.go'
4✓ ✓
/bin/zsh -lc 'ls -la && \
cat go.mod && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
✓ ✓
/bin/zsh -lc "rg -n \"Dispatcher|Record\\(|probe|health|control\" --glob '*.go' --glob '"'!**/*_test.go'"'"
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

updates = {
    Path('audit/normalize.go'): '''// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit

import (
\\t\"strings\"
)

func NormalizeKind(kind string) string {
\\treturn strings.ToLower(strings.TrimSpace(kind))
}
''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.
package service

import \"example.com/auditapp/audit\"

type Dispatcher struct {
\\tsink audit.Sink
}

func NewDispatcher(sink audit.Sink) *Dispatcher {
\\treturn &Dispatcher{sink: sink}
}

func (d *Dispatcher) Record(event audit.Event) error {
\\tevent.Kind = audit.NormalizeKind(event.Kind)
\\treturn d.sink.Write(event)
}

func DispatchAll(sink audit.Sink, events []audit.Event) error {
\\twriteEvent := audit.Sink.Write
\\tfor _, event := range events {
\\t\\tif err := writeEvent(sink, event); err "'!= nil {
'"\\t\\t\\treturn err
\\t\\t}
\\t}
\\treturn nil
}
''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.
package audit

func Classify(kind string) string {
\\tswitch NormalizeKind(kind) {
\\tcase \"health\", \"probe\":
\\t\\treturn \"control\"
\\tdefault:
\\t\\treturn \"data\"
\\t}
}
''',
}

for path, content in updates.items():
    fd, temp_name = tempfile.mkstemp(dir=path.parent, prefix=f'.{path.name}.')
    try:
        with os.fdopen(fd, 'w') as temp_file:
            temp_file.write(content)
            temp_file.flush()
            os.fsync(temp_file.fileno())
        os.replace(temp_name, path)
    except BaseException:
        try:
            os.unlink(temp_name)
        except FileNotFoundError:
            pass
        raise
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
6? ✗
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '1,30p' service/dispatch.go && \
git status --short && \
git diff --no-index /dev/null audit/normalize.go"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
7✓ ✓
/bin/zsh -lc 'go test ./... && \
git diff --check && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
? ✗
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat Makefile'
8—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—✓ ✓
/bin/zsh -lc 'go test ./...'
12—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
13—✓ ✓
/bin/zsh -lc "git status --short && \
git diff --stat && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --exit-code -- go.mod go.sum && \
git diff --name-only -- '*_test.go'"
14—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --exit-code -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' | sort && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README*' -g '*.go' | head -80"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
cat audit/normalize.go && \
rg -n \"func \\(.*Record|Record\\(|health|probe|Kind\" audit"
✓ ✓
/bin/zsh -lc "git status --short && \
rg -n 'probe|health|Record\\(' audit service"
3✓ ✓
/bin/zsh -lc "rg -n \"type Dispatcher|func .*Record|Classify|legacy|metrics\" . -g '*.go' -g '*.md'"
? ✗
/bin/zsh -lc 'cat audit/normalize.go; cat audit/summary.go; cat service/dispatch.go; cat Makefile'
4? ✗
/bin/zsh -lc 'cat service/dispatch.go audit/summary.go audit/event.go && \
rg -n "make check|func main|go test" Makefile'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
5✓ ✓
/bin/zsh -lc 'rg --files | sort'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
6✓ ✓
/bin/zsh -lc 'go test ./... && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go && \
git status --short -- go.mod go.sum'
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
7—semedit/semantic_batch (✓ ✗): { "status": "error", "results": [ { "tool": "semantic_insert_function", "status": "ok" }, { "tool": "semantic_replace_body", "symbol": "Classify", "status": "ok", "diff": "--- a/Classify\n+++ b/Classify\n-switch kind {\n-\tcase \"health\":\n-\t\treturn \"control\"\n-\tdefault:\n-\t\treturn \"data\"\n-\t}\n+switch NormalizeKind(kind) {\n+case \"health\", \"probe\":\n+\treturn \"control\"\n+default:\n+\treturn \"data\"\n+}\n" }, { "tool": "semantic_replace_body", "status": "error", "error": "replace_body Reco
{
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "auto_organize_imports": true,
        "file": "audit/normalize.go",
        "placement": "file_end",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "auto_organize_imports": true,
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "Record"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
8—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—✓ ✓
/bin/zsh -lc 'rg --files | head -60'
11—semedit/semantic_organize_imports (✓ ✓)
{
  "file": "audit/normalize.go"
}
12—✓ ✓
/bin/zsh -lc 'go test ./...'
13—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/summary_test.go audit/event_test.go service/dispatch_test.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/summary_test.go audit/event_test.go service/dispatch_test.go'

default prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency44.94s115.96s+158.0%37.02s84.68s+128.7%
Process Start → First Event0.13s0.13s—0.13s0.12s—
First Event → First Tool Call6.17s5.69s—6.73s6.55s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles714+100.0%613+116.7%
Initial Load / Discovery Turns220%220%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)714+100.0%613+116.7%
Output Tokens12702243+76.6%7491462+95.2%
Reasoning / Thinking Tokens2021166+477.2%0489—
Total Input Tokens160290346520+116.2%160229313795+95.8%
Cached Input Tokens146432302592+106.6%147456280320+90.1%
Uncached Input Tokens1385843928+217.0%1277333475+162.1%
Cost0.08970.2281+154.4%0.07820.1782+127.9%
Cached vs Uncached Token Ratio10.57:16.89:1-34.8%11.54:18.37:1-27.5%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' -g 'AGENTS*.md' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'go.mod' -g 'go.sum' | sort"
2✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
git status --short'
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
rg --files | sort | head -100'
3✓ ✓
/bin/zsh -lc "rg -n \"Dispatcher|probe|health|metrics|legacy\" --glob '*.go' --glob '"'!**/*_test.go'"' ."
semedit/semantic_inspect_symbol (✓ ✗): resolve Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790516251026513000/audit/event.go: symbol not found
{
  "file": "audit/event.go",
  "language": "go",
  "symbol": "Record"
}
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go audit/summary.go metrics/writer.go legacy/export.go'
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "language": "go",
  "path": "audit"
}
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

updates = {
    Path('audit/normalize.go'): '''// Package audit leaves room for normalization rules owned by the delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
}
for path, content in updates.items():
    fd, tmp = tempfile.mkstemp(prefix=path.name + '.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(tmp, path)
    except BaseException:
        try: os.unlink(tmp)
        except FileNotFoundError: pass
        raise
PY
"
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
cat docs/audit-sinks.md'
6✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'go.mod' -g '*.go' | sort && \
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./..."
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "language": "go",
  "path": "service"
}
7✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
8—✓ ✓
/bin/zsh -lc "python3 -c 'from pathlib import Path; import os, tempfile; p=Path(\"docs/SUBOPTIMAL_TOOLS.md\"); p.parent.mkdir(parents=True, exist_ok=True); old=p.read_text() if p.exists() else \"# Suboptimal semantic tool behavior\\n\"; entry=\"\\n- Tool: "'`semantic_inspect_symbol`'"\\n  Target: "'`audit/event.go`'"\\n  Observed failure: lookup for "'`Record` returned symbol not found because `Record` is in `service/dispatch.go`.'"\\n  Workaround: located the method through the "'`service` semantic outline.'"\\n  Root cause: incorrect file scope supplied to the lookup.\\n\"; fd,name=tempfile.mkstemp(dir=p.parent); f=os.fdopen(fd,\"w\"); f.write(old+entry); f.flush(); os.fsync(f.fileno()); f.close(); os.replace(name,p)'"
9—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
12—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git status --short && \
git diff -- go.mod go.sum'
13—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
14—✓ ✓
/bin/zsh -lc 'go test ./...'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' -g 'AGENTS.md' -g 'AGENTS.override.md'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README.md' -g 'go.mod' -g 'go.sum' -g '*.go' | head -100"
2✓ ✓
/bin/zsh -lc "sed -n '1,220p' audit/normalize.go && \
sed -n '1,260p' audit/event.go && \
sed -n '1,240p' audit/fanout.go && \
sed -n '1,180p' AGENTS.override.md"
✓ ✓
/bin/zsh -lc 'rg --files | sort | head -100; git status --short; cat AGENTS.override.md'
3✓ ✓
/bin/zsh -lc "rg -n \"Dispatcher|Record\\(|health|probe|control|NormalizeKind|module\" ."
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go audit/summary.go audit/sink.go Makefile 2>/dev/null; rg --files'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
6✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --quiet -- go.mod go.sum'
semedit/semantic_inspect_symbol (✓ ✗): resolve NormalizeKind in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-default_task-11-mixed-sink-api-migration_1790518447825877000/audit/normalize.go: symbol not found
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md'
9—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
10—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
11—✓ ✓
/bin/zsh -lc 'go test ./...'
12—✓ ✓
/bin/zsh -lc 'git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
13—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go audit/summary.go service/dispatch.go; git status --short --untracked-files=all | head -30'

default prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency53.23s73.24s+37.6%56.65s103.99s+83.6%
Process Start → First Event0.79s0.12s—0.14s0.52s—
First Event → First Tool Call6.51s7.43s—5.26s6.15s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles713+85.7%717+142.9%
Initial Load / Discovery Turns21-50.0%12+100.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)713+85.7%717+142.9%
Output Tokens13991205-13.9%18392045+11.2%
Reasoning / Thinking Tokens315310-1.6%488818+67.6%
Total Input Tokens161006393452+144.4%167255415861+148.6%
Cached Input Tokens146432350720+139.5%152576380928+149.7%
Uncached Input Tokens1457442732+193.2%1467934933+138.0%
Cost0.09450.2134+125.9%0.10390.2184+110.1%
Cached vs Uncached Token Ratio10.05:18.21:1-18.3%10.39:110.90:1+4.9%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/*.go' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'Makefile' -g 'go.mod'"
2✓ ✓
/bin/zsh -lc "rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'README*' -g 'Makefile' -g '*.go'"
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
3✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat service/dispatch.go && \
cat go.mod'
semedit/semantic_inspect_symbol (✓ ✗): resolve Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790516073348707000/audit/event.go: symbol not found
{
  "file": "audit/event.go",
  "symbol": "Record"
}
4✓ ✓
/bin/zsh -lc "cat audit/sink.go && \
cat audit/summary.go && \
rg -n 'health|probe|control|Record\\('"
semedit/semantic_inspect_symbol (✓ ✗): resolve NormalizeKind in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790516073348707000/audit/normalize.go: symbol not found
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

updates = {
    Path('audit/normalize.go'): '''// Package audit provides normalization rules for event kinds.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n'''
}
for path, content in updates.items():
    fd, name = tempfile.mkstemp(dir=path.parent, prefix=path.name + '.')
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(name, path)
    except BaseException:
        try: os.unlink(name)
        except FileNotFoundError: pass
        raise
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
semedit/semantic_outline (✓ ✓)
{
  "path": "."
}
6✓ ✓
/bin/zsh -lc 'git status --short && \
git diff --stat && \
go test ./...'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
7✓ ✓
/bin/zsh -lc "git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '10,20p' service/dispatch.go"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—semedit/semantic_batch (✓ ✓)
{
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "auto_organize_imports": true,
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "auto_organize_imports": false,
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
9—semedit/semantic_organize_imports (✓ ✓)
{
  "file": "audit/normalize.go"
}
10—? ✗
/bin/zsh -lc 'make check'
11—✓ ✓
/bin/zsh -lc 'git diff -- go.mod go.sum && \
git status --short'
12—✓ ✓
/bin/zsh -lc 'go test ./...'
13—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g '*.go' -g 'Makefile' | head -100"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'docs/**' | head -100"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
sed -n '1,240p' audit/fanout.go && \
sed -n '1,240p' audit/event.go && \
rg -n \"Dispatcher|Record\\(|probe|health|control\" --glob '*.go'"
✓ ✓
/bin/zsh -lc "cat PROJECT_BRIEF.md 2>/dev/null; rg --files -g 'Makefile' -g 'go.mod' -g 'AGENTS.md' -g 'AGENTS.override.md' | head -30"
3✓ ✓
/bin/zsh -lc "cat service/dispatch.go audit/summary.go metrics/metrics.go metrics/writer.go legacy/export.go audit/sink.go; rg --files -g 'go.mod' -g 'README*' -g 'Makefile' -g 'PROJECT_BRIEF.md'; git status --short"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile, time
updates = {
    'audit/normalize.go': '''// Package audit defines normalization rules owned by the delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    'service/dispatch.go': '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
    'audit/summary.go': '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
}
for name, content in updates.items():
    path = Path(name)
    old_mtime = path.stat().st_mtime_ns if path.exists() else 0
    fd, temp_name = tempfile.mkstemp(prefix=f'.{path.name}.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w', encoding='utf-8', newline='') as stream:
            stream.write(content)
            stream.flush()
            os.fsync(stream.fileno())
        os.replace(temp_name, path)
        now = time.time_ns()
        if now <= old_mtime:
            now = old_mtime + 1
        os.utime(path, ns=(now, now))
    except BaseException:
        try:
            os.unlink(temp_name)
        except FileNotFoundError:
            pass
        raise
PY
git diff -- audit/normalize.go service/dispatch.go audit/summary.go
git diff --exit-code -- go.mod go.sum"
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc 'cat audit/normalize.go; git status --short -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum; git diff --stat'
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go'
6✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'makefile' -g 'go.mod' -g 'go.sum' -g '*.md' | sort | head -60; git check-ignore -v audit/normalize.go service/dispatch.go audit/summary.go; git ls-files audit/normalize.go service/dispatch.go audit/summary.go; git status --short --untracked-files=all | head -30"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
7✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff --exit-code -- go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—✓ ✓
/bin/zsh -lc 'rg --files | head -50'
9—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
10—semedit/semantic_replace_body (✓ ✗): replace_body Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-default_task-11-mixed-sink-api-migration_1790518227244160000/service/dispatch.go: symbol not found
{
  "auto_organize_imports": false,
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "Record"
}
11—semedit/semantic_replace_body (✓ ✓)
{
  "body": "kind = NormalizeKind(kind)\nswitch kind {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
12—? ✗
/bin/zsh -lc 'ls docs/SUBOPTIMAL_TOOLS.md 2>/dev/null; cat docs/SUBOPTIMAL_TOOLS.md 2>/dev/null'
13—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
14—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
15—✓ ✓
/bin/zsh -lc 'go test ./...'
16—✓ ✓
/bin/zsh -lc "git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go docs/SUBOPTIMAL_TOOLS.md && \
git diff -- go.mod go.sum && \
git status --short -- '*_test.go'"
17—✓ ✓
/bin/zsh -lc 'pwd; ls -l audit/normalize.go audit/summary.go service/dispatch.go; git diff -- go.mod go.sum; git status --short -- audit/normalize.go audit/summary.go service/dispatch.go'

default prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency61.82s69.34s+12.2%40.69s89.45s+119.8%
Process Start → First Event0.12s0.13s—0.13s0.13s—
First Event → First Tool Call9.34s5.74s—4.58s5.57s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles814+75.0%715+114.3%
Initial Load / Discovery Turns21-50.0%12+100.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)814+75.0%715+114.3%
Output Tokens17631282-27.3%12261611+31.4%
Reasoning / Thinking Tokens410389-5.1%231397+71.9%
Total Input Tokens203583251885+23.7%162108361233+122.8%
Cached Input Tokens186880228864+22.5%147456328704+122.9%
Uncached Input Tokens1670323021+37.8%1465232529+122.0%
Cost0.11560.1357+17.3%0.09170.1886+105.7%
Cached vs Uncached Token Ratio11.19:19.94:1-11.1%10.06:110.10:1+0.4%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'Makefile' -g 'audit/**' -g '"'!go.mod'"' -g '"'!go.sum'"'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README.md' -g '*.go' -g 'go.mod' -g 'go.sum' | head -100"
2✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'Makefile' -g '*.go'"
✓ ✓
/bin/zsh -lc 'cat AGENTS.override.md && \
cat PROJECT_BRIEF.md 2>/dev/null || \
true && \
cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go'
3✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Record"
}
4✓ ✓
/bin/zsh -lc "cat metrics/writer.go && \
cat legacy/export.go && \
rg -n 'probe|health|Record\\(|classif|control' . -g '"'!go.mod'"' -g '"'!go.sum'"'"
semedit/semantic_lookup (✓ ✗): resolve health: symbol not found
{
  "symbol": "health"
}
5? ✗
/bin/zsh -lc 'cat audit/summary.go && \
cat Makefile && \
git status --short'
semedit/semantic_lookup (✓ ✗): resolve probe: symbol not found
{
  "symbol": "probe"
}
6✓ ✓
/bin/zsh -lc "rg --files -g '"'!go.mod'"' -g '"'!go.sum'"' -g '"'!**/*_test.go'"' && \
cat go.mod"
✓ ✓
/bin/zsh -lc 'cat audit/sink.go && \
cat metrics/writer.go && \
cat legacy/export.go'
7✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git status --short && \
git diff --check && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go'
✓ ✓
/bin/zsh -lc "rg -n 'health|probe|control|Classif' --glob '"'!**/*_test.go'"' ."
8✓ ✓
/bin/zsh -lc 'git rev-parse --show-toplevel && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --no-index /dev/null audit/normalize.go || \
true'
✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat go.mod'
9—semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
10—semedit/semantic_batch (✓ ✓)
{
  "edits": [
    {
      "params": {
        "auto_organize_imports": false,
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
11—✓ ✓
/bin/zsh -lc 'go test ./...'
12—semedit/semantic_verify (✓ ✓)
{
  "path": "."
}
13—✓ ✓
/bin/zsh -lc "git status --short && \
git diff -- go.mod go.sum '*_test.go' && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go"
14—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'go.mod' -g 'go.sum' -g 'Makefile' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'README.md' -g '*.go' -g 'go.mod' -g 'go.sum' -g 'Makefile' | head -100"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
rg -n \"type Dispatcher|func \\(.*Dispatcher.*Record|probe|health|Record\\(\" audit"
✓ ✓
/bin/zsh -lc "rg --files -g 'README*' -g 'AGENTS*' -g '*PROMPT*' -g 'PROJECT_BRIEF.md' -g 'Makefile'"
3✓ ✓
/bin/zsh -lc "rg -n \"Dispatcher|Classify|probe|audit\" --glob '*.go' --glob '"'!**/*_test.go'"'"
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go audit/summary.go audit/event.go audit/sink.go && \
git status --short && \
cat go.mod'
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "path": "service"
}
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

updates = {
    Path('audit/normalize.go'): '''// Package audit defines normalization at the event delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n'''
}
for path, content in updates.items():
    fd, name = tempfile.mkstemp(dir=path.parent, prefix=path.name + '.')
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(name, path)
    finally:
        if os.path.exists(name):
            os.unlink(name)
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go"
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "path": "audit/normalize.go"
}
6✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'makefile' -g 'AGENTS.override.md' -g 'AGENTS.md' | sort && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --name-only -- '*_test.go' go.mod go.sum"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
7✓ ✓
/bin/zsh -lc 'go test ./...'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
8—semedit/semantic_insert_function (✓ ✓)
{
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- go.mod go.sum'
12—semedit/semantic_verify (✓ ✓)
{
  "path": "."
}
13—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "language": "go",
  "symbol": "NormalizeKind"
}
14—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
15—? ✗
/bin/zsh -lc 'git rev-parse --show-toplevel; git status --short --untracked-files=all; git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go || \
true; git diff --no-index /dev/null audit/normalize.go'

default prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency38.26s89.79s+134.7%37.45s66.89s+78.6%
Process Start → First Event0.12s0.12s—0.12s0.13s—
First Event → First Tool Call5.67s5.34s—5.94s8.65s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles615+150.0%512+140.0%
Initial Load / Discovery Turns220%21-50.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)615+150.0%512+140.0%
Output Tokens10381409+35.7%7751302+68.0%
Reasoning / Thinking Tokens227420+85.0%0311—
Total Input Tokens161070261416+62.3%141922329178+131.9%
Cached Input Tokens147456229120+55.4%120064297472+147.8%
Uncached Input Tokens1361432296+137.2%2185831706+45.1%
Cost0.08670.1609+85.5%0.09430.1738+84.2%
Cached vs Uncached Token Ratio10.83:17.09:1-34.5%5.49:19.38:1+70.8%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum'"
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile'"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
sed -n '1,240p' audit/normalize.go && \
sed -n '1,260p' audit/event.go && \
sed -n '1,240p' audit/sink.go"
✓ ✓
/bin/zsh -lc 'cat PROJECT_BRIEF.md 2>/dev/null; rg --files'
3✓ ✓
/bin/zsh -lc "rg -n \"Dispatcher|Record\\(|health|probe|control|persist|Export|metrics\" ."
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
cat audit/event_test.go && \
cat audit/summary_test.go'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Record"
}
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
6✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '10,22p' service/dispatch.go && \
git rev-parse --show-toplevel && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
7—semedit/semantic_inspect_symbol (✓ ✗): resolve NormalizeKind in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790515780768791000/audit/normalize.go: symbol not found
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
8—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "auto_organize_imports": false,
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—? ✗
/bin/zsh -lc 'make check'
12—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
13—✓ ✓
/bin/zsh -lc 'go test ./... && \
git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
14—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
15—? ✗
/bin/zsh -lc 'git diff --no-index /dev/null audit/normalize.go; git diff --no-index /dev/null service/dispatch.go'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'go.mod' -g 'go.sum' | sort && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/*.go' -g 'Makefile' -g 'AGENTS.md' | sort"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
printf '\\n--- normalize.go ---\\n' && \
cat audit/normalize.go && \
printf '\\n--- event.go ---\\n' && \
cat audit/event.go && \
printf '\\n--- search Record/probe/health ---\\n' && \
rg -n 'func .*Record|Record\\(|probe|health|control' audit"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
3✓ ✓
/bin/zsh -lc "printf '%s\\n' '--- all files ---' && \
rg --files | sort && \
printf '%s\\n' '--- audit contents ---' && \
cat audit/fanout.go audit/sink.go audit/summary.go audit/transaction.go && \
printf '%s\\n' '--- references ---' && \
rg -n 'Dispatcher|\\.Record|Classify|Persist|Kind' --glob '*.go'"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat docs/audit-sinks.md && \
cat go.mod'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git status --short -- go.mod go.sum audit service'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher"
}
6—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "file": "audit/normalize.go",
        "placement": "file_end",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
7—? ✗
/bin/zsh -lc 'make check'
8—✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'go.mod' -g 'go.sum' -g '*test.go'"
9—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- go.mod go.sum && \
git diff --stat'
10—✓ ✓
/bin/zsh -lc 'git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
11—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
12—✓ ✓
/bin/zsh -lc 'go test ./...'

default prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency41.63s91.82s+120.6%43.20s64.14s+48.5%
Process Start → First Event0.13s0.12s—0.13s0.13s—
First Event → First Tool Call4.70s6.04s—5.43s9.13s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles721+200.0%810+25.0%
Initial Load / Discovery Turns12+100.0%21-50.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)721+200.0%810+25.0%
Output Tokens13081657+26.7%13181110-15.8%
Reasoning / Thinking Tokens448521+16.3%174390+124.1%
Total Input Tokens180722288411+59.6%184593230241+24.7%
Cached Input Tokens165632257792+55.6%169728198912+17.2%
Uncached Input Tokens1509030619+102.9%1486531329+110.8%
Cost0.10110.1682+66.4%0.09820.1468+49.4%
Cached vs Uncached Token Ratio10.98:18.42:1-23.3%11.42:16.35:1-44.4%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'go.sum' -g '*.go' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g '"'!go.mod'"' -g '"'!go.sum'"' | head -80"
2✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
git status --short'
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'README*' -g 'Makefile' -g '*.go' | head -80 && \
git status --short"
3✓ ✓
/bin/zsh -lc "cat audit/sink.go && \
rg -n 'health|probe|control|Kind|Record' --glob '"'!**/*_test.go'"' ."
semedit/semantic_lookup (✓ ✗): resolve NormalizeKind: symbol not found
{
  "language": "go",
  "symbol": "NormalizeKind"
}
4? ✗
/bin/zsh -lc 'cat audit/summary.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
cat Makefile'
semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "(*Dispatcher).Record"
}
5✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'README*' -g 'go.work' -g 'go.mod' | sort && \
cat go.mod"
semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
6✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test -mod=readonly ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_outline (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
7✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '10,22p' service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --no-ext-diff -- audit/normalize.go audit/summary.go service/dispatch.go"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
8—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
9—? ✗
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'README*' -g 'Makefile' -g '"'!go.mod'"' -g '"'!go.sum'"'"
10—semedit/semantic_scaffold_file (✓ ✗): file already exists: /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790515977150161000/audit/normalize.go
{
  "file": "audit/normalize.go"
}
11—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
12—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
13—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
14—? ✗
/bin/zsh -lc 'make check'
15—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
16—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- go.mod go.sum audit service metrics legacy'
17—✓ ✓
/bin/zsh -lc 'go test ./...'
18—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
19—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
20—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "language": "go",
  "symbol": "NormalizeKind"
}
21—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff --stat && \
git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go || \
true'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum' | sort"
✓ ✓
/bin/zsh -lc "git status --short && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'Makefile' -g '*.go' audit"
2✓ ✓
/bin/zsh -lc 'cat PROJECT_BRIEF.md 2>/dev/null; cat audit/normalize.go; cat audit/event.go; cat audit/fanout.go; cat audit/sink.go'
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
3✓ ✓
/bin/zsh -lc "rg -n \"Dispatcher|Record\\(|health|probe|control|persist|metrics|legacy\" . -g '"'!go.sum'"' -g '"'!go.mod'"'"
✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
rg -n \"type Dispatcher|func .*Record|health|probe\" --glob '*.go' . && \
sed -n '1,160p' Makefile && \
test -f PROJECT_BRIEF.md && \
cat PROJECT_BRIEF.md || \
true"
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go; cat audit/summary.go; cat docs/audit-sinks.md; cat Makefile 2>/dev/null; cat go.mod'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc 'rg --files | sort'
✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'makefile' -g 'go.mod' -g 'PROJECT_BRIEF.md' -g 'AGENTS*'"
6✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

def atomic(path, content):
    p = Path(path)
    fd, tmp = tempfile.mkstemp(dir=p.parent, prefix=p.name + '.')
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(tmp, p)
    except BaseException:
        try: os.unlink(tmp)
        except FileNotFoundError: pass
        raise

atomic('audit/normalize.go', '''// Package audit leaves room for normalization rules owned by the delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''')
atomic('service/dispatch.go', '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''')
atomic('audit/summary.go', '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''')
PY
gofmt -w audit/normalize.go service/dispatch.go audit/summary.go
git diff -- audit/normalize.go service/dispatch.go audit/summary.go"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
7✓ ✓
/bin/zsh -lc 'git status --short && \
cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/summary.go && \
git diff --stat'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8✓ ✓
/bin/zsh -lc 'go test ./...'
semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "file": "audit/normalize.go",
        "placement": "file_end",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "Dispatcher.Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
9—✓ ✓
/bin/zsh -lc 'go test ./...'
10—semedit/semantic_verify (✓ ✓)
{
  "path": "."
}

default prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency54.12s100.78s+86.2%33.56s77.23s+130.1%
Process Start → First Event0.70s0.82s—0.12s0.16s—
First Event → First Tool Call6.65s4.41s—6.09s6.27s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles718+157.1%516+220.0%
Initial Load / Discovery Turns01—220%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)718+157.1%516+220.0%
Output Tokens10992456+123.5%7981397+75.1%
Reasoning / Thinking Tokens3251081+232.6%146445+204.8%
Total Input Tokens201349563911+180.1%141534338475+139.1%
Cached Input Tokens185856518144+178.8%128256305664+138.3%
Uncached Input Tokens1549345767+195.4%1327832811+147.1%
Cost0.10300.2882+179.8%0.07710.1815+135.5%
Cached vs Uncached Token Ratio12.00:111.32:1-5.6%9.66:19.32:1-3.6%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g '*dispatcher*' -g 'Makefile' -g 'go.mod' -g 'go.sum'"
✓ ✓
/bin/zsh -lc 'rg --files'
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
rg -n \"Record\\(|health|probe|control\" . -g '*.go' -g '"'!**/*_test.go'"'"
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat service/dispatch.go'
3✓ ✓
/bin/zsh -lc 'cat service/dispatch.go audit/summary.go && \
cat AGENTS.override.md'
semedit/semantic_outline (✓ ✓)
{
  "path": "."
}
4✓ ✓
/bin/zsh -lc 'rg --files'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git status --short && \
git diff -- go.mod go.sum'
semedit/semantic_inspect_symbol (✓ ✗): resolve NormalizeKind in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790515679910424000/audit/normalize.go: symbol not found
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
6✓ ✓
/bin/zsh -lc 'git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
cat go.mod'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
7✓ ✓
/bin/zsh -lc 'cat audit/normalize.go audit/summary.go service/dispatch.go && \
git rev-parse --show-toplevel && \
git check-ignore -v audit/normalize.go'
semedit/semantic_batch (✓ ✗): { "status": "error", "results": [ { "tool": "semantic_insert_function", "status": "ok" }, { "tool": "semantic_replace_body", "status": "error", "error": "replace_body Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790515679910424000/service/dispatch.go: symbol not found" } ], "final_diff": "--- a/audit/normalize.go\n+++ b/audit/normalize.go\n // Package audit leaves room for normalization rules owned by the delivery b
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "file": "audit/normalize.go",
        "placement": "file_end",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
8—✓ ✓
/bin/zsh -lc "rg --files | rg 'SUBOPTIMAL|AGENTS' && \
cat audit/normalize.go"
9—✓ ✓
/bin/zsh -lc 'mkdir -p docs && \
temp=$(mktemp docs/.SUBOPTIMAL_TOOLS.XXXXXX) && \
cat > "$temp" <<'"'EOF'
# Suboptimal Tool Behavior

- Tool: "'`semantic_batch` (`semantic_replace_body`)
- Target: `service/dispatch.go`
- Observed failure: The batch could not resolve method `Record` when specified by its short name, although semantic inspection identified `Dispatcher.Record`.
- Workaround: Retry the body replacement using the qualified receiver name `(*Dispatcher).Record`.
- Root cause: Method resolution requires the receiver-qualified symbol name in this workspace.
EOF
sync "$temp" && \
mv "$temp" docs/SUBOPTIMAL_TOOLS.md'
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—semedit/semantic_replace_body (✓ ✓)
{
  "auto_organize_imports": true,
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
12—semedit/semantic_organize_imports (✓ ✓)
{
  "add": [
    "strings"
  ],
  "file": "audit/normalize.go"
}
13—? ✗
/bin/zsh -lc 'make check'
14—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- go.mod go.sum && \
git diff --'
15—✓ ✓
/bin/zsh -lc 'go test ./...'
16—? ✗
/bin/zsh -lc 'pwd; git rev-parse --show-toplevel; git status --short -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum docs/SUBOPTIMAL_TOOLS.md; ls -ld audit service docs; git diff --no-index /dev/null audit/normalize.go'
17—✓ ✓
/bin/zsh -lc 'realpath docs/SUBOPTIMAL_TOOLS.md; realpath audit/normalize.go; git status --short --untracked-files=all -- audit service docs'
18—semedit/semantic_verify (✓ ✓)
{
  "path": "."
}
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' -g 'docs/**' | head -80"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README*' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum'"
2✓ ✓
/bin/zsh -lc "git status --short && \
rg --files | head -100 && \
sed -n '1,240p' audit/fanout.go && \
sed -n '1,240p' audit/normalize.go && \
sed -n '1,220p' audit/event.go"
✓ ✓
/bin/zsh -lc 'rg --files | sort | head -80'
3✓ ✓
/bin/zsh -lc "rg -n \"Record|Dispatcher|probe|health|control|NormalizeKind\" . -g '"'!*.sum'"' -g '"'!go.mod'"'; sed -n '1,240p' audit/sink.go; sed -n '1,240p' service/dispatch.go; sed -n '1,160p' docs/audit-sinks.md; sed -n '1,100p' AGENTS.override.md"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_inspect_symbol (✓ ✗): read Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-default_task-11-mixed-sink-api-migration_1790517865676480000/audit: read /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-default_task-11-mixed-sink-api-migration_1790517865676480000/audit: is a directory
{
  "file": "audit",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- go.mod go.sum'
✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat AGENTS.override.md'
6—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
8—semedit/semantic_insert_function (✓ ✓)
{
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—✓ ✓
/bin/zsh -lc "git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --exit-code -- go.mod go.sum && \
git status --short -- '*_test.go'"
12—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
13—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service"
}
14—? ✗
/bin/zsh -lc 'git rev-parse --show-toplevel && \
git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go || \
true && \
git diff --no-index /dev/null audit/normalize.go'
15—? ✗
/bin/zsh -lc 'cat audit/summary.go service/dispatch.go && \
git diff --no-index /dev/null audit/normalize.go'
16—✓ ✓
/bin/zsh -lc 'go test ./...'

default prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency32.24s65.51s+103.2%45.09s82.53s+83.1%
Process Start → First Event0.13s0.12s—0.13s0.13s—
First Event → First Tool Call4.87s5.56s—6.06s6.12s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles512+140.0%714+100.0%
Initial Load / Discovery Turns21-50.0%01—
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)512+140.0%714+100.0%
Output Tokens828837+1.1%12531495+19.3%
Reasoning / Thinking Tokens1860-100.0%243601+147.3%
Total Input Tokens139761357002+155.4%162866238787+46.6%
Cached Input Tokens127232327680+157.5%148480205056+38.1%
Uncached Input Tokens1252929322+134.0%1438633731+134.5%
Cost0.07580.1657+118.6%0.09180.1618+76.3%
Cached vs Uncached Token Ratio10.16:111.18:1+10.0%10.32:16.08:1-41.1%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'README*' -g 'audit/**' -g 'Makefile' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum' -g 'docs/**' | head -100"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
printf '\\n--- normalize.go ---\\n' && \
cat audit/normalize.go && \
printf '\\n--- event.go ---\\n' && \
cat audit/event.go && \
printf '\\n--- sink.go ---\\n' && \
cat audit/sink.go && \
printf '\\n--- files ---\\n' && \
rg -n \"Record\\(|health|probe|control\" audit"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
3✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat audit/summary_test.go && \
rg -n "type Dispatcher|Dispatcher|.Record|Classify"'
semedit/semantic_inspect_symbol (✓ ✗): resolve Dispatcher.Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790516370218693000/audit/sink.go: symbol not found
{
  "file": "audit/sink.go",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
4? ✗
/bin/zsh -lc 'cat service/dispatch.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
rg -n "func .*check|make check" Makefile'
✓ ✓
/bin/zsh -lc "rg -n 'type Dispatcher|func .*Record|probe|health|Classify' --glob '"'!**/*_test.go'"' ."
5✓ ✓
/bin/zsh -lc 'git status --short && \
go test ./... && \
git status --short'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
6—semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
7—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
8—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
10—? ✗
/bin/zsh -lc 'make check'
11—semedit/semantic_verify (✓ ✓)
{
  "path": "audit"
}
12—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --exit-code -- go.mod go.sum'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g '*dispatcher*' -g 'Makefile' -g 'go.mod' -g 'go.sum'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile' -g 'docs/**'"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/fanout.go && \
cat audit/event.go && \
rg -n \"Record\\(|health|probe|control\" audit"
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
3✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat audit/transaction.go && \
cat audit/sink.go && \
rg -n "Dispatcher|Record|Persist|Legacy|metrics|Metric|Classify" .'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat docs/audit-sinks.md && \
cat service/dispatch_test.go'
semedit/semantic_lookup (✓ ✗): resolve NormalizeKind: symbol not found
{
  "symbol": "NormalizeKind"
}
5✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g '*.go' | sort"
✓ ✓
/bin/zsh -lc 'rg --files'
6✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

def atomic_write(path, content):
    path = Path(path)
    fd, temp = tempfile.mkstemp(dir=path.parent, prefix=f'.{path.name}.')
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(temp, path)
    except BaseException:
        try: os.unlink(temp)
        except FileNotFoundError: pass
        raise

atomic_write('audit/normalize.go', '''// Package audit leaves room for normalization rules owned by the delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''')
atomic_write('audit/summary.go', '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''')
path = Path('service/dispatch.go')
text = path.read_text()
text = text.replace('func (d *Dispatcher) Record(event audit.Event) error {\\n\\treturn d.sink.Write(event)\\n}', 'func (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}')
atomic_write(path, text)
PY

gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
7✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
rg -n -A3 'func \\(d \\*Dispatcher\\) Record' service/dispatch.go && \
git -C \""'$(pwd)" status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
go test ./...'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
8—✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
cat go.mod && \
rg -n 'health|probe|control|Record\\(' service audit"
9—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "auto_organize_imports": true,
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
10—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
11—✓ ✓
/bin/zsh -lc 'go test ./... && \
git status --short && \
git diff -- go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go'
12—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
13—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
14—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}

default prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency44.68s67.36s+50.8%43.14s118.99s+175.8%
Process Start → First Event0.12s0.13s—0.54s0.12s—
First Event → First Tool Call9.25s4.82s—7.21s5.68s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles610+66.7%915+66.7%
Initial Load / Discovery Turns110%10-100.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)610+66.7%915+66.7%
Output Tokens10451133+8.4%9972570+157.8%
Reasoning / Thinking Tokens286310+8.4%1461327+808.9%
Total Input Tokens161937238454+47.3%204825466527+127.8%
Cached Input Tokens127232217600+71.0%188928429568+127.4%
Uncached Input Tokens3470520854-39.9%1589736959+132.5%
Cost0.13520.1246-7.9%0.10130.2485+145.4%
Cached vs Uncached Token Ratio3.67:110.43:1+184.6%11.88:111.62:1-2.2%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 11 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'go.mod' -g 'go.sum' -g '*.go' -g 'Makefile' | head -80 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README.md' -g '*.go' | head -120"
2? ✗
/bin/zsh -lc "cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat Makefile 2>/dev/null && \
rg -n 'probe|health|NormalizeKind|control' . --glob '"'!**/*_test.go'"'"
? ✗
/bin/zsh -lc "cat AGENTS.override.md && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' && \
git status --short && \
cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go"
3✓ ✓
/bin/zsh -lc "cat audit/sink.go && \
rg --files -g 'README*' -g 'Makefile' -g '*.md' && \
rg -n 'Dispatcher|probe|health|control' ."
✓ ✓
/bin/zsh -lc "cat audit/normalize.go; cat service/dispatch.go; cat audit/event.go; cat audit/sink.go; rg -n 'probe|health|Record\\(' --glob '*.go'; rg --files"
4✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat docs/audit-sinks.md && \
cat go.mod && \
cat service/dispatch_test.go && \
cat audit/summary_test.go'
✓ ✓
/bin/zsh -lc 'cat audit/summary.go; cat docs/audit-sinks.md; cat go.mod; git status --short'
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
6? ✗
/bin/zsh -lc 'cat audit/normalize.go && \
git status --short && \
git diff --stat && \
git diff --no-index /dev/null audit/normalize.go'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
7—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
9—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service"
}
10—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/summary.go && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum && \
git status --short -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README*' -g 'AGENTS*' -g 'go.mod' -g 'go.sum' -g 'Makefile' -g '*.go' | head -160"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS*.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum' -g '*dispatcher*' -g '*normalize*'"
2? ✗
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat PROJECT_BRIEF.md 2>/dev/null'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
3? ✗
/bin/zsh -lc "rg -n \"probe|health|control|Kind|Record\\(\" --glob '*.go' --glob '*.md' . && \
cat audit/sink.go && \
cat audit/fanout.go && \
cat Makefile 2>/dev/null"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4? ✗
/bin/zsh -lc "cat audit/summary.go; cat metrics/metrics.go; cat legacy/export.go; rg --files -g 'Makefile' -g 'go.work' -g 'go.sum'"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
5✓ ✓
/bin/zsh -lc "rg --files -g '"'!*.go'"' -g '"'!*.json'"' -g '"'!*.yaml'"' -g '"'!*.yml'"' | sort"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
6✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat go.mod && \
git status --short'
? ✗
/bin/zsh -lc 'make check'
7✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go service/dispatch.go audit/summary.go && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go && \
git status --short -- go.mod go.sum'
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
8✓ ✓
/bin/zsh -lc 'cat audit/normalize.go; cat audit/summary.go; git diff -- audit/normalize.go service/dispatch.go audit/summary.go'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
9✓ ✓
/bin/zsh -lc 'git status --short && \
git check-ignore -v audit/normalize.go service/dispatch.go audit/summary.go || \
true && \
go test ./...'
semedit/semantic_replace_body (✓ ✗): replace_body Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-default_task-11-mixed-sink-api-migration_1790518507756063000/service/dispatch.go: symbol not found
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "Record"
}
10—? ✗
/bin/zsh -lc "rg --files -g 'SUBOPTIMAL_TOOLS.md' -g 'Makefile' -g 'PROJECT_BRIEF.md' && \
cat audit/normalize.go && \
cat docs/SUBOPTIMAL_TOOLS.md"
11—✓ ✓
/bin/zsh -lc 'rg --files'
12—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
13—✓ ✓
/bin/zsh -lc "python3 -c 'import os,tempfile; p=\"docs/SUBOPTIMAL_TOOLS.md\"; os.makedirs(\"docs\",exist_ok=True); data=\"## 2026-09-27\\n\\n- Tool: "'`semantic_replace_body`'"\\n- Target: "'`service/dispatch.go`, `(*Dispatcher).Record`'"\\n- Observed failure: lookup using the unqualified symbol "'`Record` returned `symbol not found`.'"\\n- Workaround: retried with the receiver-qualified symbol "'`(*Dispatcher).Record`, which succeeded.'"\\n- Root cause: the semantic tool requires receiver qualification for this method in this workspace.\\n\"; fd,t=tempfile.mkstemp(dir=\"docs\",prefix=\".SUBOPTIMAL_TOOLS.\"); f=os.fdopen(fd,\"w\"); f.write(data); f.flush(); os.fsync(f.fileno()); f.close(); os.replace(t,p)' && \
git status --short && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go docs/SUBOPTIMAL_TOOLS.md go.mod go.sum"
14—✓ ✓
/bin/zsh -lc 'git rev-parse --show-toplevel && \
git status --short -- audit/normalize.go service/dispatch.go audit/summary.go docs/SUBOPTIMAL_TOOLS.md go.mod go.sum && \
cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/summary.go && \
cat docs/SUBOPTIMAL_TOOLS.md'
15—✓ ✓
/bin/zsh -lc 'go test ./...'

default prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency48.28s100.23s+107.6%41.96s77.31s+84.2%
Process Start → First Event0.12s0.14s—0.12s0.20s—
First Event → First Tool Call7.99s7.32s—6.93s11.69s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles620+233.3%713+85.7%
Initial Load / Discovery Turns110%20-100.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)620+233.3%713+85.7%
Output Tokens14621787+22.2%10261727+68.3%
Reasoning / Thinking Tokens404497+23.0%282910+222.7%
Total Input Tokens141831402807+184.0%183658222362+21.1%
Cached Input Tokens127232368640+189.7%168704192768+14.3%
Uncached Input Tokens1459934167+134.0%1495429594+97.9%
Cost0.09160.2061+125.0%0.09590.1551+61.8%
Cached vs Uncached Token Ratio8.72:110.79:1+23.8%11.28:16.51:1-42.3%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g '*.go' -g 'go.mod' -g 'go.sum' | head -100 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/*.go' -g 'AGENTS.md' -g 'AGENTS.override.md'"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
rg -n \"probe|health|control|Record\\(\" --glob '*.go' ."
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
3✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat go.mod && \
cat service/dispatch_test.go'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
4✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile
updates = {
    'audit/normalize.go': '''// Package audit owns event-kind normalization at the delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    'service/dispatch.go': '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
    'audit/summary.go': '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
}
for name, content in updates.items():
    path = Path(name)
    fd, tmp = tempfile.mkstemp(dir=path.parent, prefix=path.name + '.')
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(tmp, path)
    except BaseException:
        try: os.unlink(tmp)
        except FileNotFoundError: pass
        raise
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Classify"
}
5? ✗
/bin/zsh -lc "git status --short && \
git diff --no-index /dev/null audit/normalize.go; rg --files -g 'Makefile' -g 'README*' -g '*.sh'"
✓ ✓
/bin/zsh -lc 'rg --files'
6✓ ✓
/bin/zsh -lc 'go test ./...'
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/normalize.go && \
cat audit/summary.go'
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
9—semedit/semantic_scaffold_file (✓ ✗): file already exists: /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790516523962131000/audit/normalize.go
{
  "file": "audit/normalize.go",
  "package": "audit"
}
10—? ✗
/bin/zsh -lc 'rg --files docs && \
cat docs/SUBOPTIMAL_TOOLS.md'
11—semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
12—✓ ✓
/bin/zsh -lc "python3 -c 'import os,tempfile; p=\"docs/SUBOPTIMAL_TOOLS.md\"; d=os.path.dirname(p); fd,t=tempfile.mkstemp(dir=d); f=os.fdopen(fd,\"w\"); f.write(\"# Suboptimal Tool Behavior\\n\\n- Tool: "'`semantic_scaffold_file`'"\\n- Target: "'`audit/normalize.go`'"\\n- Observed failure: rejected scaffolding because the placeholder file already exists.\\n- Workaround: inserted the function into the existing file with "'`semantic_insert_function`.'"\\n- Root cause: the file was present but had no declarations.\\n\"); f.flush(); os.fsync(f.fileno()); f.close(); os.replace(t,p); os.utime(p,None)'"
13—semedit/semantic_batch (✓ ✓)
{
  "edits": [
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "add": [
          "strings"
        ],
        "file": "audit/normalize.go"
      },
      "tool": "semantic_organize_imports"
    }
  ]
}
14—? ✗
/bin/zsh -lc 'make check'
15—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go docs/SUBOPTIMAL_TOOLS.md'
16—semedit/semantic_verify (✗ ?): This action was rejected due to unacceptable risk. Reason: Workspace-wide verification may format and mutate test files, conflicting with the explicit prohibition on editing tests; use a read-only or narrowly scoped check instead. Do not bypass this rejection through a workaround or indirect execution. Continue with a safer alternative, or carry out checks to prove that the action is authorized or low risk before trying again. Complete unaffected work without asking for confirmation. Report anything that re
{
  "path": "."
}
17—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
git diff --no-index /dev/null audit/normalize.go || \
true'
18—semedit/semantic_verify (✓ ✓)
{
  "path": "service/dispatch.go"
}
19—semedit/semantic_verify (✓ ✓)
{
  "path": "audit/summary.go"
}
20—semedit/semantic_verify (✓ ✓)
{
  "path": "audit/normalize.go"
}
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS*.md' -g '*.go' | head -100"
semedit/semantic_outline (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
2✓ ✓
/bin/zsh -lc 'cat AGENTS.override.md && \
rg --files | head -100'
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'README*' -g '"'!**/*_test.go'"' | head -60"
3✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat docs/audit-sinks.md'
semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
4✓ ✓
/bin/zsh -lc "cat audit/sink.go audit/fanout.go audit/transaction.go audit/summary.go && \
rg -n 'health|probe|control|Record\\('"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc 'cat go.mod && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'README*' -g 'AGENTS*' | head -60"
6✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
7✓ ✓
/bin/zsh -lc 'cat audit/normalize.go audit/summary.go service/dispatch.go; git -C . rev-parse --show-toplevel; git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
✓ ✓
/bin/zsh -lc 'git status --short'
8—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "file": "audit/normalize.go",
        "placement": "file_end",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
9—✓ ✓
/bin/zsh -lc 'git diff -- go.mod go.sum; git status --short -- audit service'
10—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
11—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
12—✓ ✓
/bin/zsh -lc 'git diff -- audit service; git status --short -- go.mod go.sum audit service'
13—✓ ✓
/bin/zsh -lc 'go test ./...'

default prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency52.40s78.41s+49.6%49.70s62.40s+25.6%
Process Start → First Event0.12s0.12s—0.14s0.14s—
First Event → First Tool Call5.83s7.62s—5.83s5.96s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles613+116.7%713+85.7%
Initial Load / Discovery Turns13+200.0%12+100.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)613+116.7%713+85.7%
Output Tokens15891453-8.6%16031370-14.5%
Reasoning / Thinking Tokens437572+30.9%271453+67.2%
Total Input Tokens142245362505+154.8%204595242477+18.5%
Cached Input Tokens109056331776+204.2%188928209152+10.7%
Uncached Input Tokens3318930729-7.4%1566733325+112.7%
Cost0.13560.1851+36.5%0.10980.1584+44.2%
Cached vs Uncached Token Ratio3.29:110.80:1+228.6%12.06:16.28:1-48.0%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'go.sum' -g 'audit/**' -g '"'!**/*_test.go'"' && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README*' -g 'AGENTS.md' -g 'go.mod' -g 'audit/**' -g 'Makefile' | head -80"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/event.go && \
rg -n \"func \\(.*\\) Record|Dispatcher|probe|health|control\" . -g '*.go' -g '"'!**/*_test.go'"' && \
rg --files"
✓ ✓
/bin/zsh -lc 'rg --files | head -60'
3✓ ✓
/bin/zsh -lc 'cat AGENTS.override.md && \
cat service/dispatch.go && \
cat audit/summary.go && \
cat audit/sink.go && \
cat docs/audit-sinks.md && \
cat go.mod && \
'
✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat audit/normalize.go'
4✓ ✓
/bin/zsh -lc 'cat audit/summary_test.go && \
cat service/dispatch_test.go && \
cat metrics/writer.go && \
cat legacy/export.go'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

updates = {
    Path('audit/normalize.go'): '''// Package audit defines normalization rules at the event delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
}
for path, content in updates.items():
    old_stat = path.stat()
    fd, tmp_name = tempfile.mkstemp(prefix=f'.{path.name}.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.chmod(tmp_name, old_stat.st_mode)
        os.replace(tmp_name, path)
        os.utime(path, None)
    finally:
        if os.path.exists(tmp_name):
            os.unlink(tmp_name)
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
go test ./..."
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "language": "go",
  "path": "audit"
}
6✓ ✓
/bin/zsh -lc "git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum '*_test.go' && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --quiet -- go.mod go.sum; printf 'module_metadata_unchanged=%s\\n' \""'$?"'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
7—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
8—semedit/semantic_replace_body (✓ ✓)
{
  "auto_organize_imports": true,
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
10—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
11—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
12—✓ ✓
/bin/zsh -lc 'go test ./...'
13—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' -g 'AGENTS.md' -g 'AGENTS.override.md' | sort && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS*.md' -g 'README*' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum'"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/event.go && \
rg -n \"Record\\(|probe|health|Dispatcher\" audit"
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'Makefile' -g 'AGENTS.md' -g 'AGENTS.override.md' -g '"'!**/*_test.go'"'"
3✓ ✓
/bin/zsh -lc "cat audit/sink.go audit/fanout.go audit/summary.go audit/transaction.go && \
rg -n \"type Dispatcher|func \\(.*\\) Record|Record\\(\" . -g '*.go'"
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
4? ✗
/bin/zsh -lc 'cat service/dispatch.go && \
cat Makefile && \
cat go.mod'
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
5✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'go.work' -g 'README*' -g 'AGENTS*' | head -40 && \
cat audit/normalize.go"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
6✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
7✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
test ! -f Makefile'
✓ ✓
/bin/zsh -lc 'rg --files'
8—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "file": "audit/normalize.go",
        "placement": "file_end",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
9—✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md'
10—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- go.mod go.sum'
11—✓ ✓
/bin/zsh -lc 'git status --short -- audit service go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go'
12—✓ ✓
/bin/zsh -lc 'go test ./...'
13—semedit/semantic_verify (✓ ✓)
{
  "path": "."
}

default prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency47.43s56.90s+20.0%39.29s87.20s+121.9%
Process Start → First Event0.12s0.12s—0.13s0.13s—
First Event → First Tool Call4.59s4.59s—4.56s5.19s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles910+11.1%713+85.7%
Initial Load / Discovery Turns23+50.0%12+100.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)910+11.1%713+85.7%
Output Tokens15281188-22.3%12351634+32.3%
Reasoning / Thinking Tokens306462+51.0%237694+192.8%
Total Input Tokens205189234054+14.1%162416424237+161.2%
Cached Input Tokens188928214528+13.6%148480387840+161.2%
Uncached Input Tokens1626119526+20.1%1393636397+161.2%
Cost0.11080.1231+11.1%0.09040.2171+140.2%
Cached vs Uncached Token Ratio11.62:110.99:1-5.4%10.65:110.66:1+0.0%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'go.sum' -g 'audit/**' -g 'Makefile'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum'"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
sed -n '1,240p' audit/event.go && \
sed -n '1,240p' audit/sink.go && \
git status --short"
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat audit/summary.go && \
cat AGENTS.override.md'
3✓ ✓
/bin/zsh -lc "rg -n 'Dispatcher|Record|probe|health|control|metrics|legacy' . -g '"'!go.mod'"' -g '"'!go.sum'"' -g '"'!**/*_test.go'"'"
✓ ✓
/bin/zsh -lc 'rg --files'
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go audit/summary.go legacy/export.go metrics/writer.go && \
rg --files'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat AGENTS.override.md && \
'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
6✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

updates = {
    Path('audit/normalize.go'): '''// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit

import (
\\t\"strings\"
)

func NormalizeKind(kind string) string {
\\treturn strings.ToLower(strings.TrimSpace(kind))
}
''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.
package service

import \"example.com/auditapp/audit\"

type Dispatcher struct {
\\tsink audit.Sink
}

func NewDispatcher(sink audit.Sink) *Dispatcher {
\\treturn &Dispatcher{sink: sink}
}

func (d *Dispatcher) Record(event audit.Event) error {
\\tevent.Kind = audit.NormalizeKind(event.Kind)
\\treturn d.sink.Write(event)
}

func DispatchAll(sink audit.Sink, events []audit.Event) error {
\\twriteEvent := audit.Sink.Write
\\tfor _, event := range events {
\\t\\tif err := writeEvent(sink, event); err "'!= nil {
'"\\t\\t\\treturn err
\\t\\t}
\\t}
\\treturn nil
}
''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.
package audit

func Classify(kind string) string {
\\tswitch NormalizeKind(kind) {
\\tcase \"health\", \"probe\":
\\t\\treturn \"control\"
\\tdefault:
\\t\\treturn \"data\"
\\t}
}
''',
}

for path, content in updates.items():
    fd, temp_name = tempfile.mkstemp(dir=path.parent, prefix=f'.{path.name}.')
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(temp_name, path)
        dir_fd = os.open(path.parent, os.O_RDONLY)
        try:
            os.fsync(dir_fd)
        finally:
            os.close(dir_fd)
    finally:
        if os.path.exists(temp_name):
            os.unlink(temp_name)
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- go.mod go.sum '*_test.go'"
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
7✓ ✓
/bin/zsh -lc 'cat audit/normalize.go; git status --short; git diff -- audit/normalize.go audit/summary.go service/dispatch.go'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
8✓ ✓
/bin/zsh -lc 'cat audit/summary.go service/dispatch.go && \
git rev-parse --show-toplevel && \
git status --short --untracked-files=all -- audit service && \
git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go || \
true'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
9✓ ✓
/bin/zsh -lc 'go test ./...'
semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
10—✓ ✓
/bin/zsh -lc 'go test ./... && \
git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' -g '"'!go.mod'"' -g '"'!go.sum'"'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'tools/benchmark-harness/README.md' -g 'audit/**' -g 'AGENTS.md' -g 'AGENTS.override.md' | sort"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
sed -n '1,240p' audit/event.go && \
sed -n '1,240p' audit/fanout.go && \
rg -n \"Dispatcher|Record\\(|probe|health|control\" --glob '"'!go.mod'"' --glob '"'!go.sum'"'"
✓ ✓
/bin/zsh -lc 'rg --files | sort | head -100 && \
git status --short'
3✓ ✓
/bin/zsh -lc "cat service/dispatch.go audit/summary.go audit/sink.go && \
rg --files -g 'Makefile' -g 'README*' -g 'AGENTS*' -g 'PROJECT_BRIEF*'"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
4✓ ✓
/bin/zsh -lc "cat > /tmp/edit_audit.py <<'PY'
from pathlib import Path
import os, tempfile
root = Path.cwd()
changes = {
    'audit/normalize.go': '''// Package audit owns normalization at the delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    'service/dispatch.go': None,
    'audit/summary.go': None,
}
for rel, content in changes.items():
    path = root / rel
    if content is None:
        content = path.read_text()
        if rel == 'service/dispatch.go':
            content = content.replace('func (d *Dispatcher) Record(event audit.Event) error {\\n\\treturn d.sink.Write(event)\\n}', 'func (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}')
        else:
            content = content.replace('switch kind {\\n\\tcase \"health\":', 'switch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":')
    fd, tmp = tempfile.mkstemp(dir=path.parent, prefix=f'.{path.name}.')
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(tmp, path)
    finally:
        if os.path.exists(tmp):
            os.unlink(tmp)
PY
python /tmp/edit_audit.py
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go"
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "language": "go",
  "path": "audit"
}
5✓ ✓
/bin/zsh -lc 'python3 /tmp/edit_audit.py && \
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go'
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "language": "go",
  "path": "service/dispatch.go"
}
6✓ ✓
/bin/zsh -lc 'cat audit/normalize.go; git status --short; cat /tmp/edit_audit.py'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
7✓ ✓
/bin/zsh -lc "sed -n '1,35p' service/dispatch.go; cat audit/summary.go; git rev-parse --show-toplevel; git status --short -- audit/normalize.go audit/summary.go service/dispatch.go; go test ./..."
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
8—semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
11—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
12—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/*_test.go service/*_test.go'
13—? ✗
/bin/zsh -lc "git rev-parse --show-toplevel && \
git status --short --untracked-files=all | head -30 && \
git diff --no-index /dev/null audit/normalize.go || \
true && \
rg -n 'NormalizeKind|case \"health\"|event.Kind =' audit/normalize.go audit/summary.go service/dispatch.go && \
rg --files -g 'go.sum'"

default prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency39.14s70.75s+80.8%51.05s92.18s+80.6%
Process Start → First Event0.11s0.21s—0.13s0.14s—
First Event → First Tool Call4.86s9.52s—7.05s6.76s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles615+150.0%715+114.3%
Initial Load / Discovery Turns30-100.0%12+100.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)615+150.0%715+114.3%
Output Tokens11931182-0.9%15961670+4.6%
Reasoning / Thinking Tokens214383+79.0%284562+97.9%
Total Input Tokens138820250600+80.5%162336408611+151.7%
Cached Input Tokens119040217088+82.4%148480374784+152.4%
Uncached Input Tokens1978033512+69.4%1385633827+144.1%
Cost0.09680.1576+62.8%0.09530.2062+116.4%
Cached vs Uncached Token Ratio6.02:16.48:1+7.6%10.72:111.08:1+3.4%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum'"
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/event.go && \
rg -n \"Record\\(|probe|health|control|NormalizeKind\" audit"
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g '*.go' -g 'go.mod' -g 'go.sum'"
3✓ ✓
/bin/zsh -lc 'rg --files && \
cat audit/summary.go && \
cat audit/sink.go && \
cat audit/event_test.go && \
cat audit/summary_test.go'
semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat docs/audit-sinks.md && \
cat AGENTS.override.md'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile


def atomic_write(path: Path, content: str) -> None:
    mode = path.stat().st_mode & 0o777 if path.exists() else 0o644
    fd, name = tempfile.mkstemp(prefix=f'.{path.name}.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.chmod(name, mode)
        os.replace(name, path)
    finally:
        if os.path.exists(name):
            os.unlink(name)

atomic_write(Path('audit/normalize.go'), '''// Package audit owns normalization rules at the event delivery boundary.
package audit

import (
\\t\"strings\"
)

func NormalizeKind(kind string) string {
\\treturn strings.ToLower(strings.TrimSpace(kind))
}
''')
atomic_write(Path('audit/summary.go'), '''// Package audit groups delivery kinds for operational reporting.
package audit

func Classify(kind string) string {
\\tswitch NormalizeKind(kind) {
\\tcase \"health\", \"probe\":
\\t\\treturn \"control\"
\\tdefault:
\\t\\treturn \"data\"
\\t}
}
''')
atomic_write(Path('service/dispatch.go'), '''// Package service coordinates application work with the configured audit sink.
package service

import \"example.com/auditapp/audit\"

type Dispatcher struct {
\\tsink audit.Sink
}

func NewDispatcher(sink audit.Sink) *Dispatcher {
\\treturn &Dispatcher{sink: sink}
}

func (d *Dispatcher) Record(event audit.Event) error {
\\tevent.Kind = audit.NormalizeKind(event.Kind)
\\treturn d.sink.Write(event)
}

func DispatchAll(sink audit.Sink, events []audit.Event) error {
\\twriteEvent := audit.Sink.Write
\\tfor _, event := range events {
\\t\\tif err := writeEvent(sink, event); err "'!= nil {
'"\\t\\t\\treturn err
\\t\\t}
\\t}
\\treturn nil
}
''')
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
go test ./..."
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
6✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- go.mod go.sum'
? ✗
/bin/zsh -lc 'cat audit/normalize.go && \
cat PROJECT_BRIEF.md && \
git status --short'
7—semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
8—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—? ✗
/bin/zsh -lc 'make check'
11—✓ ✓
/bin/zsh -lc "git status --short && \
git diff -- go.mod go.sum '*_test.go'"
12—semedit/semantic_verify (✓ ✓)
{
  "path": "audit"
}
13—semedit/semantic_verify (✓ ✓)
{
  "path": "service"
}
14—✓ ✓
/bin/zsh -lc "git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum ':(glob)**/*_test.go'"
15—✓ ✓
/bin/zsh -lc 'go test ./...'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' -g 'AGENTS.md' -g 'AGENTS.override.md'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/*.go' -g 'Makefile' | sort"
2✓ ✓
/bin/zsh -lc "sed -n '1,240p' AGENTS.override.md && \
sed -n '1,240p' audit/normalize.go && \
sed -n '1,260p' audit/fanout.go && \
sed -n '1,240p' audit/event.go && \
rg -n \"Dispatcher|Record\\(|probe|health|control\" audit"
✓ ✓
/bin/zsh -lc 'rg --files | head -80'
3✓ ✓
/bin/zsh -lc "rg --files -g 'README*' -g 'Makefile' -g 'go.mod' -g '*.go' && \
sed -n '1,200p' audit/summary.go && \
sed -n '1,200p' audit/sink.go && \
sed -n '1,200p' audit/transaction.go"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc "sed -n '1,220p' service/dispatch.go && \
sed -n '1,240p' service/dispatch_test.go && \
sed -n '1,180p' audit/summary_test.go && \
cat go.mod"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc "cat > /tmp/update_audit.py <<'PY'
from pathlib import Path
import os

root = Path.cwd()
updates = {
    root / 'audit/normalize.go': '''// Package audit owns normalization at the delivery boundary.\\npackage audit\\n\\nimport (\\n\\t\"strings\"\\n)\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    root / 'audit/summary.go': '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
    root / 'service/dispatch.go': None,
}
for path, content in updates.items():
    if content is None:
        content = (path.read_text()).replace('return d.sink.Write(event)', 'event.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)')
    tmp = path.with_suffix(path.suffix + '.tmp')
    with tmp.open('w') as f:
        f.write(content)
        f.flush()
        os.fsync(f.fileno())
    os.replace(tmp, path)
PY
python /tmp/update_audit.py
rm /tmp/update_audit.py
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
semedit/semantic_inspect_symbol (✓ ✗): resolve NormalizeKind in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-default_task-11-mixed-sink-api-migration_1790518016020952000/audit/normalize.go: symbol not found
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
6✓ ✓
/bin/zsh -lc "cat > /tmp/update_audit.py <<'PY'
from pathlib import Path
import os

root = Path.cwd()
updates = {
    root / 'audit/normalize.go': '''// Package audit owns normalization at the delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    root / 'audit/summary.go': '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
}
path = root / 'service/dispatch.go'
updates[path] = path.read_text().replace('return d.sink.Write(event)', 'event.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)')
for path, content in updates.items():
    tmp = path.with_suffix(path.suffix + '.tmp')
    with tmp.open('w') as f:
        f.write(content)
        f.flush()
        os.fsync(f.fileno())
    os.replace(tmp, path)
PY
python3 /tmp/update_audit.py
rm /tmp/update_audit.py
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
✓ ✓
/bin/zsh -lc 'cat Makefile 2>/dev/null; cat audit/normalize.go; cat go.mod'
7✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '1,45p' service/dispatch.go && \
git status --short && \
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./..."
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—semedit/semantic_scaffold_file (✓ ✗): file already exists: /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-default_task-11-mixed-sink-api-migration_1790518016020952000/audit/normalize.go
{
  "file": "audit/normalize.go",
  "package": "audit",
  "purpose_header": "// Package audit normalizes event kinds at the audit delivery boundary."
}
9—✓ ✓
/bin/zsh -lc 'cat docs/SUBOPTIMAL_TOOLS.md 2>/dev/null || \
true'
10—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
11—semedit/semantic_batch (✓ ✓)
{
  "edits": [
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
12—✓ ✓
/bin/zsh -lc "python3 -c 'from pathlib import Path; import os, tempfile; p=Path(\"docs/SUBOPTIMAL_TOOLS.md\"); p.parent.mkdir(parents=True, exist_ok=True); old=p.read_text() if p.exists() else \"# Suboptimal semantic tool behavior\\n\"; entry=\"\\n- "'`semantic_scaffold_file` on `audit/normalize.go` reported that the file already exists. No source was changed by the failed call; used `semantic_insert_function` to add the function to the existing package stub. Root cause: scaffold is for new files only.'"\\n\"; fd, name=tempfile.mkstemp(dir=p.parent, prefix=\".SUBOPTIMAL_TOOLS.\"); f=os.fdopen(fd,\"w\"); f.write(old+entry); f.flush(); os.fsync(f.fileno()); f.close(); os.replace(name,p)'"
13—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- go.mod go.sum'
14—✓ ✓
/bin/zsh -lc 'go test ./...'
15—semedit/semantic_verify (✓ ✓)
{
  "language": "go"
}

default prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency47.70s63.96s+34.1%35.49s95.79s+169.9%
Process Start → First Event0.13s0.47s—0.14s0.13s—
First Event → First Tool Call11.06s7.52s—4.77s7.20s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles514+180.0%615+150.0%
Initial Load / Discovery Turns110%21-50.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)514+180.0%615+150.0%
Output Tokens13901237-11.0%10351498+44.7%
Reasoning / Thinking Tokens323469+45.2%144509+253.5%
Total Input Tokens142430224352+57.5%140727312334+121.9%
Cached Input Tokens129280186624+44.4%128256260096+102.8%
Uncached Input Tokens1315037728+186.9%1247152238+318.9%
Cost0.08660.1623+87.4%0.07800.2207+183.0%
Cached vs Uncached Token Ratio9.83:14.95:1-49.7%10.28:14.98:1-51.6%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'Makefile' -g '*.go' -g 'go.mod' -g 'go.sum' -g 'README*' -g 'AGENTS.override.md'"
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'go.mod' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README*' -g '*.go'"
2✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat go.mod && \
git status --short'
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
3✓ ✓
/bin/zsh -lc "cat metrics/writer.go && \
cat legacy/export.go && \
cat audit/summary.go && \
cat service/dispatch_test.go && \
rg -n 'probe|health|control|Record\\(' . --glob '"'!*.sum'"'"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "language": "go",
  "symbol": "Classify"
}
5? ✗
/bin/zsh -lc 'cat audit/normalize.go audit/summary.go service/dispatch.go; git rev-parse --show-toplevel; git status --short --untracked-files=all -- audit service go.mod go.sum; git diff --no-index /dev/null audit/normalize.go'
? ✗
/bin/zsh -lc "sed -n '1,220p' PROJECT_BRIEF.md 2>/dev/null; sed -n '1,220p' Makefile 2>/dev/null"
6—✓ ✓
/bin/zsh -lc 'rg --files'
7—✓ ✓
/bin/zsh -lc "sed -n '1,100p' audit/normalize.go; sed -n '1,100p' audit/summary.go; sed -n '1,80p' AGENTS.override.md"
8—semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—semedit/semantic_verify (✓ ✓)
{
  "path": "audit"
}
12—semedit/semantic_verify (✓ ✓)
{
  "path": "service"
}
13—✓ ✓
/bin/zsh -lc 'git status --short; git diff -- go.mod go.sum; git diff --'
14—✓ ✓
/bin/zsh -lc 'go test ./...'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'go.sum' -g '*.go' -g 'Makefile' | head -100"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS*.md' -g 'README*' -g '*.go' | head -100"
2✓ ✓
/bin/zsh -lc "cat AGENTS.md 2>/dev/null; rg -n \"func .*Record|Record\\(|probe|health|NormalizeKind\" audit service metrics legacy"
✓ ✓
/bin/zsh -lc 'cat PROJECT_BRIEF.md 2>/dev/null; cat tools/benchmark-harness/README.md 2>/dev/null; cat audit/normalize.go; cat service/dispatch.go'
3✓ ✓
/bin/zsh -lc 'cat audit/normalize.go audit/event.go audit/summary.go service/dispatch.go audit/sink.go'
semedit/semantic_outline (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc "ls -la && \
cat go.mod && \
rg --files -g 'Makefile' -g 'README*' -g '*.md'"
semedit/semantic_outline (✓ ✓)
{
  "language": "go",
  "path": "service"
}
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile
changes = {
'audit/normalize.go': '''// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit

import (
	\"strings\"
)

func NormalizeKind(kind string) string {
	return strings.ToLower(strings.TrimSpace(kind))
}
''',
'audit/summary.go': '''// Package audit groups delivery kinds for operational reporting.
package audit

func Classify(kind string) string {
	switch NormalizeKind(kind) {
	case \"health\", \"probe\":
		return \"control\"
	default:
		return \"data\"
	}
}
''',
'service/dispatch.go': '''// Package service coordinates application work with the configured audit sink.
package service

import \"example.com/auditapp/audit\"

type Dispatcher struct {
	sink audit.Sink
}

func NewDispatcher(sink audit.Sink) *Dispatcher {
	return &Dispatcher{sink: sink}
}

func (d *Dispatcher) Record(event audit.Event) error {
	event.Kind = audit.NormalizeKind(event.Kind)
	return d.sink.Write(event)
}

func DispatchAll(sink audit.Sink, events []audit.Event) error {
	writeEvent := audit.Sink.Write
	for _, event := range events {
		if err := writeEvent(sink, event); err "'!= nil {
			return err
		}
	}
	return nil
}
'"'''
}
for name, content in changes.items():
    path = Path(name)
    fd, tmp = tempfile.mkstemp(dir=path.parent, prefix=f'.{path.name}.')
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(tmp, path)
    finally:
        if os.path.exists(tmp):
            os.unlink(tmp)
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
go test ./..."
semedit/semantic_outline (✓ ✓)
{
  "language": "go",
  "path": "audit/event.go"
}
6✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- go.mod go.sum'
semedit/semantic_outline (✓ ✓)
{
  "language": "go",
  "path": "audit/fanout.go"
}
7—✓ ✓
/bin/zsh -lc 'cat audit/event.go audit/fanout.go'
8—✓ ✓
/bin/zsh -lc "cat audit/summary.go; rg -n -i 'health|probe|control' --glob '*.go'"
9—semedit/semantic_batch (✓ ✓)
{
  "edits": [
    {
      "params": {
        "auto_organize_imports": true,
        "file": "audit/normalize.go",
        "placement": "file_end",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
10—semedit/semantic_organize_imports (✓ ✓)
{
  "file": "audit/normalize.go"
}
11—✓ ✓
/bin/zsh -lc "rg --files -g 'SUBOPTIMAL_TOOLS.md' -g 'Makefile' -g 'go.mod' -g 'go.sum'; git status --short"
12—? ✗
/bin/zsh -lc "rg --files -g 'Makefile' -g 'makefile' -g 'go.mod' -g 'go.sum' -g 'README*' -g 'PROJECT_BRIEF.md'; cat audit/normalize.go; make check"
13—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum audit/*_test.go service/*_test.go'
14—✓ ✓
/bin/zsh -lc 'go test ./...'
15—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}

default prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency32.89s69.16s+110.2%52.49s110.74s+111.0%
Process Start → First Event0.14s0.12s—0.13s0.13s—
First Event → First Tool Call5.55s5.97s—5.09s6.22s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles614+133.3%821+162.5%
Initial Load / Discovery Turns110%13+200.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)614+133.3%821+162.5%
Output Tokens8481411+66.4%15611841+17.9%
Reasoning / Thinking Tokens0504—388767+97.7%
Total Input Tokens140720345962+145.9%183461378737+106.4%
Cached Input Tokens128256305664+138.3%158464344320+117.3%
Uncached Input Tokens1246440298+223.3%2499734417+37.7%
Cost0.07380.2011+172.4%0.12650.2047+61.9%
Cached vs Uncached Token Ratio10.29:17.59:1-26.3%6.34:110.00:1+57.8%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README*' -g 'AGENTS*' -g '*.go' -g 'Makefile' | head -100"
✓ ✓
/bin/zsh -lc 'rg --files'
2✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
rg --files'
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
3✓ ✓
/bin/zsh -lc 'cat service/dispatch_test.go && \
cat audit/event_test.go && \
cat audit/summary_test.go'
✓ ✓
/bin/zsh -lc 'cat audit/summary.go audit/normalize.go'
4✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat audit/sink.go && \
cat audit/summary.go && \
cat metrics/writer.go && \
cat legacy/export.go'
semedit/semantic_outline (✓ ✓)
{
  "path": "service/dispatch.go"
}
5? ✗
/bin/zsh -lc 'make check'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
6✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_batch (✓ ✓)
{
  "edits": [
    {
      "params": {
        "auto_organize_imports": true,
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
7—semedit/semantic_organize_imports (✓ ✓)
{
  "add": [
    "strings"
  ],
  "file": "audit/normalize.go"
}
8—? ✗
/bin/zsh -lc 'make check'
9—✓ ✓
/bin/zsh -lc 'rg --files docs; git status --short; git diff -- go.mod go.sum; git diff --'
10—semedit/semantic_verify (✗ ?): This action was rejected due to unacceptable risk. Reason: Workspace-wide Go verification may format and write files, potentially modifying tests despite the user's explicit prohibition; a narrower source-only verification is safer. Do not bypass this rejection through a workaround or indirect execution. Continue with a safer alternative, or carry out checks to prove that the action is authorized or low risk before trying again. Complete unaffected work without asking for confirmation. Report anything that
{
  "language": "go",
  "path": "."
}
11—✓ ✓
/bin/zsh -lc 'go test ./...'
12—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum; git status --short -- audit/normalize.go audit/summary.go service/dispatch.go audit/*_test.go service/*_test.go go.mod go.sum'
13—semedit/semantic_verify (✗ ?): This action was rejected due to unacceptable risk. Reason: Go verification formats and may write the entire audit directory, including tests, conflicting with the explicit instruction not to edit tests; verify only the changed non-test files or use a read-only check. Do not bypass this rejection through a workaround or indirect execution. Continue with a safer alternative, or carry out checks to prove that the action is authorized or low risk before trying again. Complete unaffected work without asking for
{
  "language": "go",
  "path": "audit"
}
14—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' -g 'AGENTS.md' -g 'AGENTS.override.md' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'Makefile' | sort"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
rg -n \"type Dispatcher|func \\(.*Dispatcher.*Record|probe|health\" audit"
✓ ✓
/bin/zsh -lc "rg -n \"probe|health|Record\\(\" audit"
3✓ ✓
/bin/zsh -lc "rg -n \"Dispatcher|Record\\(\" . -g '*.go' -g '"'!**/*_test.go'"' && \
cat audit/summary.go && \
cat audit/event.go && \
cat audit/fanout.go"
? ✗
/bin/zsh -lc 'git status --short && \
cat PROJECT_BRIEF.md 2>/dev/null'
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/sink.go && \
rg --files | sort | head -100'
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "language": "go",
  "path": "audit"
}
5✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat service/dispatch_test.go && \
cat audit/summary_test.go && \
cat go.mod'
semedit/semantic_inspect_symbol (✓ ✗): read Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-default_task-11-mixed-sink-api-migration_1790518196393630000/audit: read /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-default_task-11-mixed-sink-api-migration_1790518196393630000/audit: is a directory
{
  "file": "audit",
  "language": "go",
  "symbol": "(*Dispatcher).Record"
}
6✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

updates = {
    'audit/normalize.go': '''// Package audit leaves room for normalization rules owned by the delivery boundary.\\npackage audit\\n\\nimport (\\n\\t\"strings\"\\n)\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    'audit/summary.go': '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
    'service/dispatch.go': '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n'''
}
for name, content in updates.items():
    path = Path(name)
    fd, tmp = tempfile.mkstemp(prefix=f'.{path.name}.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(tmp, path)
    finally:
        if os.path.exists(tmp):
            os.unlink(tmp)
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go"
semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher"
}
7✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go; git status --short -- go.mod go.sum audit/normalize.go audit/summary.go service/dispatch.go; go test ./...'
✓ ✓
/bin/zsh -lc "rg -n \"type Dispatcher|func \\(.*Dispatcher.*Record|probe|health\" --glob '*.go' --glob '"'!**/*_test.go'"' ."
8✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '1,28p' service/dispatch.go && \
git rev-parse --show-toplevel && \
git status --short --untracked-files=all | head -30"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
9—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
10—semedit/semantic_inspect_symbol (✓ ✗): resolve NormalizeKind in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-default_task-11-mixed-sink-api-migration_1790518196393630000/audit/normalize.go: symbol not found
{
  "file": "audit/normalize.go",
  "language": "go",
  "symbol": "NormalizeKind"
}
11—semedit/semantic_outline (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
12—✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat service/dispatch.go && \
cat audit/normalize.go'
13—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
14—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
15—semedit/semantic_replace_body (✓ ✗): replace_body Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-default_task-11-mixed-sink-api-migration_1790518196393630000/service/dispatch.go: symbol not found
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "Record"
}
16—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
17—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
rg --files docs | head -20'
18—✓ ✓
/bin/zsh -lc 'go test ./...'
19—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
20—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
21—✓ ✓
/bin/zsh -lc "git diff -- go.mod go.sum '*_test.go' && \
git status --short -- go.mod go.sum '*_test.go' audit service"

default prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency34.63s67.82s+95.8%27.78s72.17s+159.8%
Process Start → First Event0.12s0.12s—0.13s0.13s—
First Event → First Tool Call4.99s7.47s—4.65s6.72s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles617+183.3%613+116.7%
Initial Load / Discovery Turns24+100.0%220%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)617+183.3%613+116.7%
Output Tokens1032972-5.8%6891027+49.1%
Reasoning / Thinking Tokens290123-57.6%083—
Total Input Tokens158968290037+82.4%158348410415+159.2%
Cached Input Tokens125952259840+106.3%144384385280+166.8%
Uncached Input Tokens3301630197-8.5%1396425135+80.0%
Cost0.13060.1541+18.1%0.07960.1730+117.3%
Cached vs Uncached Token Ratio3.81:18.60:1+125.6%10.34:115.33:1+48.2%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum'"
✓ ✓
/bin/zsh -lc "ls -la && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README*' -g 'AGENTS.md' -g 'Makefile' -g '*.go' audit"
2✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go'
✓ ✓
/bin/zsh -lc 'git status --short'
3✓ ✓
/bin/zsh -lc "rg -n \"Dispatcher|probe|health|Record|metrics|export\" . --glob '"'!go.mod'"' --glob '"'!go.sum'"'"
✓ ✓
/bin/zsh -lc "find . -maxdepth 2 -type f -not -path './.git/*' -print"
4? ✗
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
cat Makefile && \
cat docs/audit-sinks.md && \
git status --short'
✓ ✓
/bin/zsh -lc 'cat AGENTS.override.md'
5✓ ✓
/bin/zsh -lc ''
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
6✓ ✓
/bin/zsh -lc 'gofmt -d audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git status --short'
semedit/semantic_inspect_symbol (✓ ✗): resolve Dispatcher.Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790516128797211000/audit/event.go: symbol not found
{
  "file": "audit/event.go",
  "symbol": "Dispatcher.Record"
}
7—✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat go.mod'
8—semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Classify"
}
9—semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Record"
}
10—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
12—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
13—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
14—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
15—✓ ✓
/bin/zsh -lc 'git status --short -- . && \
git diff -- go.mod go.sum'
16—✓ ✓
/bin/zsh -lc 'go test ./...'
17—semedit/semantic_verify (✓ ✓)
{
  "path": "."
}
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 11 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS*.md' -g 'go.mod' -g 'go.sum' -g 'audit/**' -g 'Makefile'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/*.go' -g 'AGENTS.md' | sort"
2✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/fanout.go && \
cat audit/event.go && \
cat AGENTS.override.md'
✓ ✓
/bin/zsh -lc 'cat PROJECT_BRIEF.md 2>/dev/null; cat audit/normalize.go; cat audit/event.go; cat audit/fanout.go'
3✓ ✓
/bin/zsh -lc "rg -n \"type Dispatcher|Record\\(|health|probe|control\""
✓ ✓
/bin/zsh -lc "rg -n 'Dispatcher|Record|health|probe|control' audit"
4? ✗
/bin/zsh -lc "cat service/dispatch.go audit/summary.go go.mod && \
rg --files -g 'Makefile' -g 'README*'"
✓ ✓
/bin/zsh -lc "cat audit/summary.go; cat audit/transaction.go; cat audit/sink.go; rg -n 'Record\\(' --glob '*.go' ."
5? ✗
/bin/zsh -lc 'make check'
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go; cat service/dispatch_test.go'
6✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short && \
go test ./...'
semedit/semantic_insert_function (✓ ✓)
{
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
7—semedit/semantic_organize_imports (✓ ✓)
{
  "add": [
    "strings"
  ],
  "file": "audit/normalize.go"
}
8—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
10—? ✗
/bin/zsh -lc 'make check'
11—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
12—✓ ✓
/bin/zsh -lc 'go test ./...'
13—✓ ✓
/bin/zsh -lc "git status --short && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go && \
git diff --quiet -- go.mod go.sum; printf 'module_diff_exit=%s\\n' \""'$?"'

default prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency47.55s102.84s+116.3%51.83s100.98s+94.8%
Process Start → First Event0.12s0.13s—0.12s0.13s—
First Event → First Tool Call6.26s6.26s—4.73s5.44s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles720+185.7%717+142.9%
Initial Load / Discovery Turns220%23+50.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)720+185.7%717+142.9%
Output Tokens12822405+87.6%15162066+36.3%
Reasoning / Thinking Tokens404871+115.6%357779+118.2%
Total Input Tokens182130371966+104.2%162157419235+158.5%
Cached Input Tokens167680339200+102.3%146432387584+164.7%
Uncached Input Tokens1445032766+126.8%1572531651+101.3%
Cost0.09910.2077+109.5%0.09930.2116+113.0%
Cached vs Uncached Token Ratio11.60:110.35:1-10.8%9.31:112.25:1+31.5%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'go.sum' -g 'audit/**' -g 'Makefile' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g '*.go' -g 'Makefile' | head -100"
2✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat AGENTS.override.md'
✓ ✓
/bin/zsh -lc 'cat PROJECT_BRIEF.md 2>/dev/null; cat go.mod'
3✓ ✓
/bin/zsh -lc "rg -n \"Dispatcher|Record|health|probe|control|legacy|metrics\" . --glob '"'!go.sum'"'"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
rg --files | sort'
semedit/semantic_inspect_symbol (✓ ✗): resolve NormalizeKind in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790516421045861000/audit/normalize.go: symbol not found
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
5? ✗
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
make check'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
6✓ ✓
/bin/zsh -lc 'go test ./... && \
git diff --check && \
git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher"
}
7✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '10,22p' service/dispatch.go && \
git diff --check -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—semedit/semantic_scaffold_file (✓ ✗): file already exists: /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790516421045861000/audit/normalize.go
{
  "file": "audit/normalize.go",
  "package": "audit"
}
9—✓ ✓
/bin/zsh -lc "rg --files | rg '("'^|/)(SUBOPTIMAL_TOOLS'"\\.md|normalize\\.go)"'$'"'"
10—✓ ✓
/bin/zsh -lc "python3 -c 'from pathlib import Path; import os, tempfile; p=Path(\"docs/SUBOPTIMAL_TOOLS.md\"); p.parent.mkdir(parents=True, exist_ok=True); old=p.read_text() if p.exists() else \"# Suboptimal Tool Behavior\\n\"; entry=\"\\n- Tool: semantic_scaffold_file; target: audit/normalize.go; observed failure: rejected because the file already exists; workaround: use semantic_insert_function to add the declaration; root cause: scaffold_file only creates new files.\\n\"; fd,tmp=tempfile.mkstemp(dir=p.parent,prefix=\".SUBOPTIMAL_TOOLS.\"); f=os.fdopen(fd,\"w\"); f.write(old+entry); f.flush(); os.fsync(f.fileno()); f.close(); os.replace(tmp,p); os.utime(p,None)'"
11—semedit/semantic_batch (✓ ✗): { "status": "error", "results": [ { "tool": "semantic_insert_function", "status": "ok" }, { "tool": "semantic_replace_body", "status": "error", "error": "replace_body Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-default_task-11-mixed-sink-api-migration_1790516421045861000/service/dispatch.go: symbol not found" } ], "final_diff": "--- a/audit/normalize.go\n+++ b/audit/normalize.go\n // Package audit leaves room for normalization rules owned by the delivery b
{
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
12—✓ ✓
/bin/zsh -lc "python3 -c 'from pathlib import Path; import os, tempfile; p=Path(\"docs/SUBOPTIMAL_TOOLS.md\"); old=p.read_text(); entry=\"- Tool: semantic_replace_body; target: service/dispatch.go; observed failure: could not resolve method as Record; workaround: retry using receiver-qualified symbol (*Dispatcher).Record; root cause: Go method lookup requires receiver qualification for this tool invocation.\\n\"; fd,tmp=tempfile.mkstemp(dir=p.parent,prefix=\".SUBOPTIMAL_TOOLS.\"); f=os.fdopen(fd,\"w\"); f.write(old+entry); f.flush(); os.fsync(f.fileno()); f.close(); os.replace(tmp,p); os.utime(p,None)'"
13—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
14—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
15—semedit/semantic_organize_imports (✓ ✓)
{
  "file": "audit/normalize.go"
}
16—✓ ✓
/bin/zsh -lc 'cat Makefile 2>/dev/null; git status --short; cat go.mod; cat audit/normalize.go'
17—✓ ✓
/bin/zsh -lc 'go test ./...'
18—semedit/semantic_verify (✓ ✓)
{
  "path": "audit"
}
19—✓ ✓
/bin/zsh -lc 'git diff -- go.mod go.sum'
20—semedit/semantic_verify (✓ ✓)
{
  "path": "service"
}
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'Makefile' -g 'audit/**' -g '"'!go.mod'"' -g '"'!go.sum'"'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'Makefile' -g 'go.mod' -g 'audit/**' | sort"
2✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'AGENTS.md' -g '*.go'"
✓ ✓
/bin/zsh -lc "sed -n '1,240p' audit/normalize.go && \
sed -n '1,260p' audit/event.go && \
sed -n '1,200p' audit/fanout.go && \
sed -n '1,220p' audit/sink.go"
3✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/fanout.go && \
rg -n \"probe|health|Record\\(\""
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'Makefile' | head -40 && \
git status --short"
4? ✗
/bin/zsh -lc "cat audit/summary.go && \
cat metrics/metrics.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
rg --files -g 'Makefile' -g 'README*' -g 'PROJECT_BRIEF.md'"
semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
5? ✗
/bin/zsh -lc 'ls -la && \
rg -n "make check|go test|verification" README.md'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
6✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

updates = {
    Path('audit/normalize.go'): '''// Package audit normalizes event kinds at the delivery boundary.\\npackage audit\\n\\nimport (\\n\\t\"strings\"\\n)\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
}
for path, content in updates.items():
    mode = path.stat().st_mode
    fd, temp_name = tempfile.mkstemp(prefix=f'.{path.name}.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.chmod(temp_name, mode)
        os.replace(temp_name, path)
        dir_fd = os.open(path.parent, os.O_RDONLY)
        try:
            os.fsync(dir_fd)
        finally:
            os.close(dir_fd)
    except Exception:
        try:
            os.unlink(temp_name)
        except FileNotFoundError:
            pass
        raise
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go"
semedit/semantic_inspect_symbol (✓ ✗): resolve IsControlTraffic: symbol not found
{
  "language": "go",
  "symbol": "IsControlTraffic"
}
7✓ ✓
/bin/zsh -lc 'git diff --check && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short && \
go test -mod=readonly ./...'
semedit/semantic_outline (✓ ✓)
{
  "language": "go",
  "path": "service"
}
8—✓ ✓
/bin/zsh -lc "rg -n 'health|probe|control|Dispatcher' --glob '*.go' ."
9—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
10—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
11—semedit/semantic_batch (✓ ✗): { "status": "error", "results": [ { "tool": "semantic_insert_function", "status": "ok" }, { "tool": "semantic_replace_body", "status": "error", "error": "replace_body Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-default_task-11-mixed-sink-api-migration_1790518625734207000/service/dispatch.go: symbol not found" } ], "final_diff": "--- a/audit/normalize.go\n+++ b/audit/normalize.go\n // Package audit leaves room for normalization rules owned by the delivery b
{
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
12—semedit/semantic_organize_imports (✓ ✓)
{
  "file": "audit/normalize.go"
}
13—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
14—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
15—✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'README*' -g 'go.mod' -g 'AGENTS.md' -g 'AGENTS.override.md' | sort && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum"
16—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
17—✓ ✓
/bin/zsh -lc "sed -n '1,80p' audit/normalize.go && \
sed -n '1,70p' service/dispatch.go && \
sed -n '1,50p' audit/summary.go && \
git status --short -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum && \
go test ./..."

default prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantdefault
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency45.29s——44.78s69.47s+55.1%
Process Start → First Event0.12s——0.13s0.14s—
First Event → First Tool Call5.09s——5.34s7.08s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns1——110%
Internal Tool Cycles5——714+100.0%
Initial Load / Discovery Turns1——32-33.3%
MCP Discovery / Schema Turns0——00—
Tool Invocations (per run)5——714+100.0%
Output Tokens1348——12931305+0.9%
Reasoning / Thinking Tokens537——480310-35.4%
Total Input Tokens140433——183749341663+85.9%
Cached Input Tokens127232——169728315392+85.8%
Uncached Input Tokens13201——1402126271+87.4%
Cost0.0884——0.09960.1647+65.3%
Cached vs Uncached Token Ratio9.64:1——12.11:112.01:1-0.8%
Oracle L1: Mutation PolicyPASS——PASSPASS—
Oracle L2: AST InvariantsPASS——PASSPASS—
Oracle L3: Clean BuildPASS——PASSPASS—
Oracle L4: Verification TestPASS——PASSPASS—
Semantic Tool Invocation Verified (per run)N/A——N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'go.sum' -g 'audit/**' -g 'Makefile'"
not published
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
cat audit/normalize.go && \
sed -n '1,240p' audit/event.go && \
sed -n '1,260p' audit/sink.go && \
rg -n 'Dispatcher|Record\\(|probe|health|control' --glob '"'!**/*_test.go'"'"
not published
3? ✗
/bin/zsh -lc 'cat service/dispatch.go audit/summary.go metrics/writer.go legacy/export.go && \
cat Makefile'
not published
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
GOTOOLCHAIN=local go test -mod=readonly ./... && \
git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
not published
5✓ ✓
/bin/zsh -lc "git rev-parse --show-toplevel && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --no-ext-diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
sed -n '1,80p' audit/normalize.go && \
sed -n '1,80p' audit/summary.go && \
sed -n '1,60p' service/dispatch.go"
not published
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' -g 'docs/**' | head -100"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/*.go' -g 'AGENTS.md' -g 'AGENTS.override.md' | sort && \
git status --short"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
sed -n '1,240p' audit/event.go && \
sed -n '1,240p' audit/fanout.go && \
rg -n \"Record\\(|probe|health|Kind\" audit"
✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'README.md' | head -80 && \
rg -n \"func .*Record|probe|health|NormalizeKind\" audit"
3✓ ✓
/bin/zsh -lc 'rg --files && \
cat audit/summary.go && \
cat audit/transaction.go && \
cat audit/sink.go && \
cat Makefile 2>/dev/null || \
true && \
git status --short'
? ✗
/bin/zsh -lc "rg --files | sort | head -100 && \
cat audit/normalize.go && \
cat audit/summary.go && \
cat audit/sink.go && \
cat audit/event.go && \
rg -n \"Dispatcher|Record\\(\" . -g '*.go' -g '"'!**/*_test.go'"' && \
rg -n \"check:\" Makefile"
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat docs/audit-sinks.md && \
cat AGENTS.override.md && \
cat go.mod'
semedit/semantic_outline (✓ ✓)
{
  "language": "go",
  "path": "audit/normalize.go"
}
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
6✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/*_test.go service/*_test.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit service'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
7✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '1,24p' service/dispatch.go && \
git rev-parse --show-toplevel && \
git status --short"
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
8—semedit/semantic_replace_body (✓ ✓)
{
  "auto_organize_imports": false,
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
10—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service"
}
11—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
12—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
13—✓ ✓
/bin/zsh -lc 'go test ./...'
14—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git status --short'

prefer_discover_semedit prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency48.91s85.61s+75.1%30.41s110.27s+262.7%
Process Start → First Event0.14s0.14s—0.12s0.12s—
First Event → First Tool Call10.65s13.39s—5.69s7.50s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles616+166.7%415+275.0%
Initial Load / Discovery Turns21-50.0%21-50.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)616+166.7%415+275.0%
Output Tokens12911986+53.8%8472037+140.5%
Reasoning / Thinking Tokens404868+114.9%223682+205.8%
Total Input Tokens224204461004+105.6%139392431254+209.4%
Cached Input Tokens200704425728+112.1%123392401408+225.3%
Uncached Input Tokens2350035276+50.1%1600029846+86.5%
Cost0.13010.2303+77.0%0.08420.2090+148.1%
Cached vs Uncached Token Ratio8.54:112.07:1+41.3%7.71:113.45:1+74.4%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README*' -g 'AGENTS.md' -g 'audit/**' | head -80 && \
git status --short"
✓ ✓
/bin/zsh -lc "git status --short && \
rg --files -g 'AGENTS.md' -g 'README.md' -g 'Makefile' -g 'audit/*.go'"
2✓ ✓
/bin/zsh -lc "cat PROJECT_BRIEF.md 2>/dev/null; rg -n \"func \\(.*Record|Record\\(|health|probe|Kind\" audit"
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "path": "audit"
}
3✓ ✓
/bin/zsh -lc "cat audit/normalize.go; cat audit/event.go; cat audit/sink.go; rg -n \"type Dispatcher|func .*Record|EventKind|KindHealth|health\" --glob '*.go' ."
? ✗
/bin/zsh -lc 'cat Makefile'
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go; cat audit/summary.go; cat service/dispatch_test.go; rg --files | head -60; cat go.mod'
✓ ✓
/bin/zsh -lc "rg -n \"func \\(.*\\) Record|type Dispatcher|probe|health|"'^check:" --glob '"'"'!**/*_test.go'"' --glob '"'!go.mod'"' --glob '"'!go.sum'"' ."
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'makefile' -g 'GNUmakefile' -g 'go.work' -g 'go.mod' -g 'go.sum'"
6✓ ✓
/bin/zsh -lc 'cat audit/normalize.go; cat audit/summary.go; rg -n "NormalizeKind" service/dispatch.go; git rev-parse --show-toplevel; git status --short'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_organize_imports (✓ ✓)
{
  "add": [
    "strings"
  ],
  "file": "audit/normalize.go"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
11—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
12—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/normalize.go"
}
13—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/summary.go"
}
14—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
15—✓ ✓
/bin/zsh -lc 'go build ./... && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
16—? ✗
/bin/zsh -lc 'pwd; git rev-parse --show-toplevel; git status --short --untracked-files=all; cat audit/normalize.go; cat audit/summary.go; cat service/dispatch.go; git diff --no-index /dev/null audit/normalize.go'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'README*' -g 'go.mod' -g 'go.sum' -g '*.go' | head -100 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README*' -g 'audit/*.go' -g '.codex/**' -g '.agents/**' | sort && \
git status --short"
2✓ ✓
/bin/zsh -lc "cat PROJECT_BRIEF.md 2>/dev/null; cat AGENTS.override.md; cat audit/normalize.go; cat audit/event.go; cat audit/sink.go; rg -n \"func .*Record|Record\\(|health|probe|control\" --glob '*.go'"
✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
rg --files | rg '("'^|/)(PROJECT_BRIEF'"\\.md|Makefile|README\\.md)"'$|''^audit/'"' && \
rg -n \"type Dispatcher|func \\(.*Dispatcher.*Record|probe|health|Record\\(\" audit"
3✓ ✓
/bin/zsh -lc 'cat service/dispatch.go audit/summary.go Makefile 2>/dev/null; rg --files'
✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
cat audit/event.go && \
rg -n \"type Dispatcher|Dispatcher\\)|func .*Record|\\.Record\\(\" --glob '*.go' && \
rg --files | rg '("'^|/)README'"\\.md"'$|(''^|/)Makefile$|PROJECT_BRIEF'"\\.md|go\\.mod'"
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
cat go.mod && \
rg --files | sort | head -100 && \
git status --short audit service'
5—semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
6—semedit/semantic_batch (✓ ✗): { "status": "error", "results": [ { "tool": "semantic_insert_function", "status": "ok" }, { "tool": "semantic_replace_body", "status": "error", "error": "replace_body Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790518886911695000/service/dispatch.go: symbol not found" } ], "final_diff": "--- a/audit/normalize.go\n+++ b/audit/normalize.go\n // Package audit leaves room for normalization rules owned b
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
7—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
8—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
9—semedit/semantic_organize_imports (✓ ✓)
{
  "file": "audit/normalize.go"
}
10—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short go.mod go.sum && \
go test ./...'
11—✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '1,35p' service/dispatch.go && \
git status --short"
12—semedit/semantic_verify (✗ ?): This action was rejected due to unacceptable risk. Reason: semantic_verify on `.` may format and modify repository-wide Go files, including protected tests, contrary to the user's explicit no-test-edits constraint; verify only the changed source files instead. Do not bypass this rejection through a workaround or indirect execution. Continue with a safer alternative, or carry out checks to prove that the action is authorized or low risk before trying again. Complete unaffected work without asking for confirm
{
  "path": "."
}
13—semedit/semantic_verify (✓ ✓)
{
  "path": "audit/summary.go"
}
14—semedit/semantic_verify (✓ ✓)
{
  "path": "audit/normalize.go"
}
15—semedit/semantic_verify (✓ ✓)
{
  "path": "service/dispatch.go"
}

prefer_discover_semedit prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency46.02s88.22s+91.7%49.78s120.14s+141.4%
Process Start → First Event0.13s0.12s—0.13s0.14s—
First Event → First Tool Call8.57s8.29s—5.09s9.94s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles514+180.0%617+183.3%
Initial Load / Discovery Turns110%13+200.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)514+180.0%617+183.3%
Output Tokens16321959+20.0%15672506+59.9%
Reasoning / Thinking Tokens728863+18.5%374974+160.4%
Total Input Tokens172877513645+197.1%149027470042+215.4%
Cached Input Tokens156672479232+205.9%133376428032+220.9%
Uncached Input Tokens1620534413+112.4%1565142010+168.4%
Cost0.10920.2411+120.8%0.09670.2555+164.2%
Cached vs Uncached Token Ratio9.67:113.93:1+44.0%8.52:110.19:1+19.6%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g '*.go' | head -100 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'README.md' -g '*.go' | head -100 && \
git status --short"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go && \
rg -n \"probe|health|Record\\(\" --glob '*.go' ."
✓ ✓
/bin/zsh -lc 'cat PROJECT_BRIEF.md 2>/dev/null; cat audit/normalize.go; cat service/dispatch.go; cat audit/event.go; cat audit/sink.go'
3✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
find . -maxdepth 2 -type f | sort'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff --check && \
git status --short -- . && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "path": "metrics"
}
5✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/summary.go && \
git status --short --untracked-files=all -- . && \
git diff --no-ext-diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --quiet -- go.mod go.sum; printf 'protected_diff_exit=%s\\n' \""'$?"'
✓ ✓
/bin/zsh -lc 'cat legacy/export.go; cat audit/summary.go; cat audit/normalize.go'
6—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
7—semedit/semantic_replace_body (✓ ✗): replace_body Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790517102958664000/service/dispatch.go: symbol not found
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "Record"
}
8—✓ ✓
/bin/zsh -lc "rg --files -g 'SUBOPTIMAL_TOOLS.md' -g 'normalize.go' -g 'dispatch.go' -g 'summary.go'; git status --short"
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—? ✗
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
make check'
12—✓ ✓
/bin/zsh -lc 'go test ./...'
13—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/*_test.go service/*_test.go && \
git status --short -- audit go.mod go.sum service'
14—✓ ✓
/bin/zsh -lc 'git rev-parse --show-toplevel; git status --short; git check-ignore -v audit/normalize.go'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'go.mod' -g 'go.sum' -g '*.go' | head -160"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS*.md' -g 'README.md' -g 'go.mod' -g 'audit/**' | sort"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
cat audit/normalize.go && \
sed -n '1,240p' service/dispatch.go && \
sed -n '1,220p' audit/event.go && \
rg -n \"probe|health|Record\\(\""
✓ ✓
/bin/zsh -lc 'git status --short && \
cat AGENTS.override.md && \
cat audit/normalize.go && \
cat audit/event.go && \
cat audit/fanout.go && \
cat audit/sink.go && \
cat audit/summary.go'
3✓ ✓
/bin/zsh -lc "sed -n '1,160p' audit/summary.go && \
sed -n '1,180p' audit/sink.go && \
sed -n '1,180p' metrics/metrics.go && \
sed -n '1,120p' legacy/export.go && \
rg --files"
✓ ✓
/bin/zsh -lc "rg --files -g '"'!go.mod'"' -g '"'!go.sum'"' | sort && \
git diff -- audit/normalize.go audit/summary.go"
4? ✗
/bin/zsh -lc "git status --short && \
cat > /tmp/patch.py <<'PY'
from pathlib import Path
import os, tempfile
root = Path.cwd()
changes = {
    'audit/normalize.go': '''// Package audit leaves room for normalization rules owned by the delivery boundary.\\npackage audit\\n\\nimport (\\n\\t\"strings\"\\n)\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    'service/dispatch.go': '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
    'audit/summary.go': '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n'''
}
for name, content in changes.items():
    path = root / name
    fd, tmp = tempfile.mkstemp(dir=path.parent, prefix=path.name + '.')
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(tmp, path)
    finally:
        if os.path.exists(tmp): os.unlink(tmp)
PY
python /tmp/patch.py && \
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short"
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc 'python3 /tmp/patch.py && \
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short'
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "path": "."
}
6✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
sed -n '1,35p' audit/summary.go && \
sed -n '8,22p' service/dispatch.go && \
git rev-parse --show-prefix && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./..."
semedit/semantic_inspect_symbol (✓ ✓)
{
  "symbol": "Classify"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
8—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "auto_organize_imports": false,
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—semedit/semantic_verify (✗ ?): This action was rejected due to unacceptable risk. Reason: semantic_verify on the entire workspace can format and write Go files, including protected tests, while the user explicitly forbade test edits. Do not bypass this rejection through a workaround or indirect execution. Continue with a safer alternative, or carry out checks to prove that the action is authorized or low risk before trying again. Complete unaffected work without asking for confirmation. Report anything that remains blocked, clarify why i
{
  "language": "go",
  "path": "."
}
12—✓ ✓
/bin/zsh -lc 'go test ./... && \
git diff --check && \
git diff -- go.mod go.sum && \
git status --short'
13—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/normalize.go"
}
14—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/summary.go"
}
15—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
16—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- audit/event_test.go audit/summary_test.go audit/*_test.go service/*_test.go go.mod go.sum && \
git diff --check'
17—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit service'

prefer_discover_semedit prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency70.70s102.81s+45.4%54.97s115.33s+109.8%
Process Start → First Event0.12s0.12s—0.13s0.14s—
First Event → First Tool Call12.14s12.97s—6.41s6.43s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles713+85.7%719+171.4%
Initial Load / Discovery Turns10-100.0%13+200.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)713+85.7%719+171.4%
Output Tokens19531909-2.3%16701923+15.1%
Reasoning / Thinking Tokens1018930-8.6%388773+99.2%
Total Input Tokens321281402305+25.2%169173419380+147.9%
Cached Input Tokens294144371456+26.3%153600378112+146.2%
Uncached Input Tokens2713730849+13.7%1557341268+165.0%
Cost0.17850.2055+15.1%0.10310.2314+124.5%
Cached vs Uncached Token Ratio10.84:112.04:1+11.1%9.86:19.16:1-7.1%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README*' -g 'Makefile' -g '"'!go.mod'"' -g '"'!go.sum'"' | head -80 && \
git status --short && \
rg --files audit"
✓ ✓
/bin/zsh -lc "pwd; rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'docs/**' | head -100; git status --short; rg -n \"func \\(.*\\) Record|Dispatcher|probe|health|control\" audit --glob '*.go'"
2✓ ✓
/bin/zsh -lc "rg --files | rg '("'^|/)(dispatcher|audit|PROJECT_BRIEF|Makefile|README)'"' && \
rg -n \"func \\(.*\\) Record|probe|health|NormalizeKind\" --glob '*.go' ."
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go; cat audit/summary.go; cat audit/event.go; cat audit/sink.go; cat docs/audit-sinks.md'
3✓ ✓
/bin/zsh -lc 'cat audit/normalize.go audit/summary.go audit/event.go audit/sink.go service/dispatch.go docs/audit-sinks.md'
✓ ✓
/bin/zsh -lc "rg --files | sort; rg -n \"type Dispatcher|func .*Record|Classify\\(\" --glob '*.go'"
4✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'go.mod' -g 'go.sum' -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'README*' && \
git status --short -- audit/ service/ metrics/ legacy/ go.mod go.sum && \
rg -n \"audit\\.Classify|Classify\\(\" --glob '*.go' ."
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go; cat go.mod; git diff -- audit service go.mod go.sum'
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
6✓ ✓
/bin/zsh -lc 'git status --short -- audit service metrics legacy go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --check && \
git status --short -- go.mod go.sum'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
7✓ ✓
/bin/zsh -lc 'cat audit/normalize.go audit/summary.go service/dispatch.go && \
git rev-parse --show-toplevel && \
git status --short --untracked-files=all | head -30 && \
git ls-files audit/normalize.go'
semedit/semantic_insert_function (✓ ✓)
{
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
8—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
10—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
11—✓ ✓
/bin/zsh -lc 'git status --short; git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum; cat audit/normalize.go'
12—✓ ✓
/bin/zsh -lc 'go test ./...'
13—✓ ✓
/bin/zsh -lc 'git status --short --untracked-files=all -- audit service go.mod go.sum; cat audit/summary.go; cat service/dispatch.go; git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'Makefile' -g 'audit/**' -g 'docs/**' | head -200"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'go.mod' -g 'go.sum' -g 'Makefile' | sort"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'Makefile' -g '*.go' | sort && \
rg -n \"type Dispatcher|func \\(.*Dispatcher.*Record|health|probe|Record\\(\" . --glob '*.go' --glob '"'!**/*_test.go'"'"
? ✗
/bin/zsh -lc "cat PROJECT_BRIEF.md 2>/dev/null; git status --short; rg --files -g 'AGENTS.md' -g 'README*' audit"
3✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/summary.go && \
cat audit/event.go && \
cat audit/fanout.go && \
cat audit/sink.go && \
cat docs/audit-sinks.md && \
cat Makefile 2>/dev/null; git status --short'
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'README*' | sort; rg -n 'func \\(.*Record|Record\\(|probe|health|control' audit"
4✓ ✓
/bin/zsh -lc "cat go.mod && \
rg -n \"NormalizeKind|Classify\\(\" --glob '*.go' && \
rg --files | sort"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

changes = {
    Path('audit/normalize.go'): '''// Package audit leaves room for normalization rules owned by the delivery boundary.\\npackage audit\\n\\nimport (\\n\\t\"strings\"\\n)\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n'''
}
for path, content in changes.items():
    fd, temp_name = tempfile.mkstemp(prefix=path.name + '.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(temp_name, path)
    except BaseException:
        try: os.unlink(temp_name)
        except FileNotFoundError: pass
        raise
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go"
✓ ✓
/bin/zsh -lc 'rg --files | sort | head -100; find . -name AGENTS.md -o -name PROJECT_BRIEF.md'
6✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --no-index /dev/null audit/normalize.go; go test ./...'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher"
}
7✓ ✓
/bin/zsh -lc "git ls-files --error-unmatch audit/normalize.go service/dispatch.go audit/summary.go 2>&1; git status --short --untracked-files=all -- audit service; sed -n '1,30p' service/dispatch.go; sed -n '1,20p' audit/summary.go; test "'! -e Makefile && \
echo '"'No Makefile present'"
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Classify"
}
8—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
9—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
10—semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
11—semedit/semantic_replace_body (✓ ✓)
{
  "body": "kind = NormalizeKind(kind)\n\tswitch kind {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
12—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
13—✓ ✓
/bin/zsh -lc 'git diff -- go.mod go.sum audit/*_test.go service/*_test.go; git status --short -- audit service go.mod go.sum; git diff -- audit/normalize.go audit/summary.go service/dispatch.go'
14—✓ ✓
/bin/zsh -lc 'go test ./...'
15—semedit/semantic_verify (✓ ✓)
{
  "path": "."
}
16—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
17—✓ ✓
/bin/zsh -lc 'git rev-parse --show-toplevel; git status --short --untracked-files=all; git check-ignore -v audit/normalize.go service/dispatch.go 2>/dev/null || \
true'
18—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
19—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}

prefer_discover_semedit prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency50.16s65.57s+30.7%53.56s102.01s+90.5%
Process Start → First Event0.12s0.13s—0.13s0.14s—
First Event → First Tool Call10.50s12.25s—6.36s13.45s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles48+100.0%611+83.3%
Initial Load / Discovery Turns13+200.0%110%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)48+100.0%611+83.3%
Output Tokens19601552-20.8%18972248+18.5%
Reasoning / Thinking Tokens764517-32.3%5751030+79.1%
Total Input Tokens196257292976+49.3%228474466598+104.2%
Cached Input Tokens174336258816+48.5%203776432640+112.3%
Uncached Input Tokens2192134160+55.8%2469833958+37.5%
Cost0.13240.1760+32.9%0.14360.2340+63.0%
Cached vs Uncached Token Ratio7.95:17.58:1-4.7%8.25:112.74:1+54.4%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'README.md' -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'go.mod' -g 'go.sum' -g '*.go' | sort | head -160 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g '*.go' -g 'go.mod' -g 'go.sum' | head -80 && \
git status --short"
2✓ ✓
/bin/zsh -lc 'rg --files | sort && \
cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
cat AGENTS.override.md'
✓ ✓
/bin/zsh -lc 'cat AGENTS.override.md && \
rg --files'
3✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat audit/sink.go && \
cat audit/summary.go && \
cat service/dispatch_test.go && \
cat audit/event_test.go'
✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat go.mod'
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "path": "audit"
}
5—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
6—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
7—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "file": "audit/normalize.go",
        "placement": "file_end",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
8—✓ ✓
/bin/zsh -lc 'go test ./... && \
git diff --check -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/summary_test.go audit/event_test.go service/dispatch_test.go'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g '*.go' -g 'Makefile' -g 'go.mod' -g 'go.sum' | sort && \
git status --short"
? ✗
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'tools/benchmark-harness/README.md' -g 'audit/*.go' -g 'AGENTS.md' -g 'AGENTS.override.md' && \
git status --short && \
sed -n '1,220p' tools/benchmark-harness/README.md"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/event.go && \
cat service/dispatch.go && \
cat go.mod && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md'"
✓ ✓
/bin/zsh -lc "ls -la && \
sed -n '1,240p' audit/normalize.go && \
sed -n '1,260p' audit/event.go && \
rg -n \"type Dispatcher|func \\(.*Dispatcher.*Record|Record\\(\" --glob '*.go' ."
3✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
rg -n -i 'health|probe|control|Record\\(|Kind' --glob '*.go'"
✓ ✓
/bin/zsh -lc "sed -n '1,200p' service/dispatch.go && \
rg -n \"health|probe|control|Kind\" service audit legacy metrics api"
4? ✗
/bin/zsh -lc 'cat audit/summary.go && \
cat audit/sink.go && \
cat audit/fanout.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
cat Makefile'
semedit/semantic_outline (✓ ✓)
{
  "path": "service/dispatch.go"
}
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_outline (✓ ✓)
{
  "path": "audit/normalize.go"
}
6✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '10,20p' service/dispatch.go && \
git status --short --untracked-files=all"
✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat audit/sink.go && \
cat audit/normalize.go && \
cat go.mod'
7—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "file": "audit/normalize.go",
        "placement": "file_end",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "auto_organize_imports": false,
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
8—semedit/semantic_verify (✓ ✓)
{
  "path": "audit"
}
9—✓ ✓
/bin/zsh -lc 'go test ./...'
10—✓ ✓
/bin/zsh -lc "git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit service go.mod go.sum && \
git status --short -- '*_test.go'"
11—✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '10,20p' service/dispatch.go && \
git rev-parse --show-toplevel"

prefer_discover_semedit prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency56.74s94.62s+66.7%51.35s64.91s+26.4%
Process Start → First Event0.12s0.12s—0.12s0.12s—
First Event → First Tool Call8.17s11.90s—5.06s8.06s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles713+85.7%711+57.1%
Initial Load / Discovery Turns110%12+100.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)713+85.7%711+57.1%
Output Tokens21171935-8.6%18491484-19.7%
Reasoning / Thinking Tokens738694-6.0%490596+21.6%
Total Input Tokens213741380168+77.9%259457365001+40.7%
Cached Input Tokens186880345344+84.8%234240328192+40.1%
Uncached Input Tokens2686134824+29.6%2521736809+46.0%
Cost0.14960.2063+37.9%0.15080.2001+32.6%
Cached vs Uncached Token Ratio6.96:19.92:1+42.5%9.29:18.92:1-4.0%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'audit/**' -g '*.go' | head -100 && \
git status --short"
? ✗
/bin/zsh -lc "git status --short && \
rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/*.go' -g 'docs/adr/README.md' -g 'docs/research/README.md' | sort && \
make check"
2✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go'
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
3✓ ✓
/bin/zsh -lc "rg -n \"health|probe|control|Kind|Dispatcher\" . -g '"'!go.mod'"' -g '"'!go.sum'"'"
? ✗
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'Makefile' | sort | head -80 && \
rg -n \"Dispatcher|Record\\(|probe|health|control\" audit --glob '*.go' && \
sed -n '1,180p' audit/normalize.go && \
sed -n '1,160p' Makefile"
4✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
cat go.mod'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
✓ ✓
/bin/zsh -lc "rg --files | sort | head -100 && \
rg -n \"probe|health|Dispatcher|Record\" --glob '*.go' --glob '"'!**/*_test.go'"' ."
6✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '10,22p' service/dispatch.go && \
git status --short"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "symbol": "Classify"
}
7✓ ✓
/bin/zsh -lc "git ls-files --error-unmatch audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum >/dev/null; printf 'tracked=%s\\n' \""'$?"; gofmt -d audit/normalize.go audit/summary.go service/dispatch.go; git diff --check -- audit/normalize.go audit/summary.go service/dispatch.go'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
8—semedit/semantic_insert_function (✓ ✓)
{
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
go test ./...'
12—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
13—✓ ✓
/bin/zsh -lc "sed -n '1,80p' audit/normalize.go && \
sed -n '1,50p' audit/summary.go && \
sed -n '1,40p' service/dispatch.go && \
git rev-parse --show-toplevel && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'README.md' -g '*.go' | head -100"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'README.md' -g '*.go' | head -80"
2✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'Makefile' -g 'go.mod' -g 'go.sum'; cat audit/normalize.go; sed -n '1,240p' audit/event.go; sed -n '1,260p' service/dispatch.go; sed -n '1,180p' audit/sink.go; git status --short"
? ✗
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat Makefile'
3✓ ✓
/bin/zsh -lc "rg -n \"health|probe|Record\\(|control|persist|Dispatcher\" --glob '*.go' .; rg --files -g 'Makefile' -g 'README*' -g 'PROJECT_BRIEF.md'; sed -n '1,200p' health/health.go; sed -n '1,200p' metrics/metrics.go; sed -n '1,180p' legacy/export.go; cat AGENTS.override.md"
semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
4✓ ✓
/bin/zsh -lc 'cat audit/summary.go; cat go.mod; cat service/dispatch_test.go'
semedit/semantic_outline (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
import os
from pathlib import Path

updates = {
    'audit/normalize.go': '''// Package audit owns normalization rules at the event delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    'audit/summary.go': '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
    'service/dispatch.go': '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
}
for name, content in updates.items():
    path = Path(name)
    tmp = path.with_name(path.name + '.tmp')
    with open(tmp, 'w', encoding='utf-8') as f:
        f.write(content)
        f.flush()
        os.fsync(f.fileno())
    os.replace(tmp, path)
    fd = os.open(path.parent, os.O_RDONLY)
    try:
        os.fsync(fd)
    finally:
        os.close(fd)
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
go test ./..."
✓ ✓
/bin/zsh -lc "cat service/dispatch.go && \
cat audit/summary.go && \
rg --files -g 'Makefile' -g 'makefile' -g 'go.work' -g 'go.mod' -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' && \
git status --short"
6✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --check -- audit/normalize.go audit/summary.go service/dispatch.go'
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
7✓ ✓
/bin/zsh -lc "cat audit/normalize.go; cat audit/summary.go; sed -n '10,23p' service/dispatch.go; git rev-parse --show-toplevel; git status --short"
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go'
8—semedit/semantic_batch (✓ ✓)
{
  "edits": [
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "kind = NormalizeKind(kind)\nswitch kind {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
9—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
10—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service"
}
11—✓ ✓
/bin/zsh -lc "git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '1,24p' service/dispatch.go"

prefer_discover_semedit prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency115.90s129.69s+11.9%46.25s118.69s+156.6%
Process Start → First Event0.12s0.13s—0.13s0.15s—
First Event → First Tool Call61.17s18.72s—9.56s9.49s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles519+280.0%712+71.4%
Initial Load / Discovery Turns110%01—
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)519+280.0%712+71.4%
Output Tokens14222388+67.9%15332540+65.7%
Reasoning / Thinking Tokens6551090+66.4%5081508+196.9%
Total Input Tokens286005396392+38.6%257964314366+21.9%
Cached Input Tokens269824351744+30.4%232192285184+22.8%
Uncached Input Tokens1618144648+175.9%2577229182+13.2%
Cost0.13390.2430+81.5%0.14800.1949+31.7%
Cached vs Uncached Token Ratio16.68:17.88:1-52.8%9.01:19.77:1+8.5%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS*' -g 'audit/**' -g 'Makefile' | sort && \
git status --short && \
rg -n \"func \\(.*\\) Record|Probe|Health|health|probe|Record\\(\" audit"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'go.mod' -g 'go.sum' -g 'README.md'"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go audit/event.go audit/sink.go audit/summary.go && \
rg -n \"type Dispatcher|func \\(.*Dispatcher.*Record|Dispatcher\" --glob '*.go' ."
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
3? ✗
/bin/zsh -lc 'cat service/dispatch.go && \
cat go.mod && \
cat Makefile && \
cat audit/summary_test.go service/dispatch_test.go'
semedit/semantic_inspect_symbol (✓ ✗): resolve NormalizeKind in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790517336539018000/audit/normalize.go: symbol not found
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_inspect_symbol (✓ ✗): resolve Dispatcher.Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790517336539018000/audit/sink.go: symbol not found
{
  "file": "audit/sink.go",
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc 'git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
cat audit/normalize.go audit/summary.go service/dispatch.go && \
rg --files | sort'
semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
6—✓ ✓
/bin/zsh -lc 'rg --files'
7—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- go.mod go.sum'
8—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
9—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
10—✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat go.mod && \
ls'
11—semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "Classify"
}
12—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
13—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
14—✓ ✓
/bin/zsh -lc 'go test ./...'
15—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
16—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
17—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
18—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
19—? ✗
/bin/zsh -lc 'git rev-parse --show-prefix && \
git ls-files --error-unmatch audit/normalize.go audit/summary.go service/dispatch.go'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/**' -g '*dispatcher*' -g 'AGENTS.md' -g 'AGENTS.override.md' | head -100 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'normalize.go' -g '*.go' | head -100 && \
git status --short"
2✓ ✓
/bin/zsh -lc "rg -n \"type Dispatcher|func \\(.*\\) Record|probe|health|NormalizeKind\" . --glob '"'!**/*_test.go'"' --glob '"'!go.mod'"' --glob '"'!go.sum'"'"
✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
sed -n '1,240p' audit/event.go && \
sed -n '1,260p' service/dispatch.go && \
rg -n 'probe|health|Record\\(' audit service"
3? ✗
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/summary.go && \
cat audit/sink.go && \
cat PROJECT_BRIEF.md 2>/dev/null'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go service/dispatch.go audit/summary.go && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go && \
git status --short'
semedit/semantic_lookup (✓ ✗): resolve probe: symbol not found
{
  "symbol": "probe"
}
5? ✗
/bin/zsh -lc 'git rev-parse --show-toplevel && \
git status --short -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum && \
cat Makefile 2>/dev/null && \
git diff --no-index /dev/null audit/normalize.go'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
6✓ ✓
/bin/zsh -lc 'ls -la | head -40 && \
git status --short -- .scratch/benchmarks/run_codex_baseline-diff_large-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790519547654166000 && \
git diff -- .scratch/benchmarks/run_codex_baseline-diff_large-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790519547654166000/audit/normalize.go'
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
7✓ ✓
/bin/zsh -lc 'git check-ignore -v audit/normalize.go service/dispatch.go audit/summary.go || \
true; cat audit/normalize.go; cat service/dispatch.go; cat audit/summary.go; go test ./...'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
8—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
9—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
10—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service"
}
11—✓ ✓
/bin/zsh -lc 'go test ./audit ./service && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go audit/*_test.go service/*_test.go go.mod go.sum'
12—✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '1,30p' service/dispatch.go && \
git status --short --untracked-files=all"

prefer_discover_semedit prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency48.63s69.94s+43.8%43.35s118.43s+173.2%
Process Start → First Event0.12s0.11s—0.13s0.13s—
First Event → First Tool Call11.00s10.19s—7.68s9.13s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles59+80.0%617+183.3%
Initial Load / Discovery Turns220%110%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)59+80.0%617+183.3%
Output Tokens15161567+3.4%12782254+76.4%
Reasoning / Thinking Tokens503500-0.6%550857+55.8%
Total Input Tokens189654358599+89.1%191343463476+142.2%
Cached Input Tokens173824328704+89.1%175872423936+141.0%
Uncached Input Tokens1583029895+88.9%1547139540+155.6%
Cost0.10830.1828+68.8%0.10550.2437+131.0%
Cached vs Uncached Token Ratio10.98:111.00:1+0.1%11.37:110.72:1-5.7%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' -g 'docs/**' | head -100 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile' | sort && \
git status --short"
2? ✗
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/sink.go && \
cat audit/event.go && \
rg -n \"func \\(.*Record|Record\\(|health|probe|control\" --glob '*.go' --glob '"'!**/*_test.go'"' . && \
cat docs/audit-sinks.md && \
rg -n '"'^check:|make check|Verification'"' Makefile"
✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
rg -n \"Record\\(|health|probe|control\" audit --glob '*.go' && \
ls"
3✓ ✓
/bin/zsh -lc "cat service/dispatch.go && \
cat audit/summary.go && \
rg --files -g 'Makefile' -g 'go.work' -g 'README*' -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go && \
git status --short -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum"
✓ ✓
/bin/zsh -lc "rg -n \"type Dispatcher|func \\(.*\\) Record|Classify\\(\" . --glob '*.go' && \
cat audit/summary.go && \
find . -maxdepth 2 -name PROJECT_BRIEF.md -print"
4? ✗
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
make check'
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat go.mod && \
find . -maxdepth 2 -type f | sort'
5✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go'
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
6—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
7—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
go test ./...'
9—? ✗
/bin/zsh -lc 'cat audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --no-index /dev/null audit/normalize.go'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'README*' -g '*.go' | head -100 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'tools/benchmark-harness/README.md' -g 'audit/*.go' -g 'AGENTS*.md' | sort && \
git status --short"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go && \
rg -n \"probe|health|Record\\(\" --glob '*.go' ."
✓ ✓
/bin/zsh -lc "cat tools/benchmark-harness/README.md 2>/dev/null; cat PROJECT_BRIEF.md 2>/dev/null; rg --files audit; rg -n \"type Dispatcher|func \\(.*Record|probe|health|NormalizeKind|classif\" audit"
3✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat metrics/metrics.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
cat audit/fanout.go && \
cat audit/transaction.go && \
cat AGENTS.override.md'
semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "language": "go",
  "path": "audit"
}
5✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
✓ ✓
/bin/zsh -lc "cat audit/normalize.go audit/summary.go audit/event.go service/dispatch.go; rg --files | rg '("'^|/)README.md$|PROJECT_BRIEF.md'"' | head -30"
6✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git rev-parse --show-toplevel && \
git status --short'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
7—? ✗
/bin/zsh -lc 'make check'
8—semedit/semantic_batch (✓ ✓)
{
  "edits": [
    {
      "params": {
        "auto_organize_imports": true,
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "auto_organize_imports": true,
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
9—semedit/semantic_organize_imports (✓ ✓)
{
  "add": [
    "strings"
  ],
  "file": "audit/normalize.go"
}
10—semedit/report_feedback (✓ ✓)
{
  "command": "semantic_batch",
  "intent": "Add normalization to an existing Go package and update a method to use it.",
  "interface": "mcp",
  "manual_touchups": "Added the missing strings import with semantic_organize_imports.",
  "observed_result": "The batch applied the function body using strings but left its import unresolved, reporting undefined: strings diagnostics.",
  "parameters": {
    "edits": [
      "semantic_insert_function",
      "semantic_replace_body",
      "semantic_replace_body"
    ]
  },
  "suggested_fix": "Resolve and organize imports after each batch or include a package import operation when an inserted body introduces a new dependency.",
  "target_context": "audit/normalize.go",
  "unexpected_reason": "The batch accepted the new declaration but did not add its required standard library import, leaving introduced diagnostics until a separate semantic import operation."
}
11—semedit/semantic_verify (✗ ?): This action was rejected due to unacceptable risk. Reason: Verification may format and write across the entire workspace, potentially modifying tests or protected metadata despite the user’s explicit prohibition; a narrower read-only or changed-file verification is needed. Do not bypass this rejection through a workaround or indirect execution. Continue with a safer alternative, or carry out checks to prove that the action is authorized or low risk before trying again. Complete unaffected work without ask
{
  "language": "go",
  "path": "."
}
12—✓ ✓
/bin/zsh -lc 'git status --short -- . && \
git diff -- go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go'
13—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/normalize.go"
}
14—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/summary.go"
}
15—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
16—✓ ✓
/bin/zsh -lc 'git status --short -- . && \
git diff -- go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go'
17—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go audit/summary.go service/dispatch.go; git status --short --untracked-files=all -- .; git diff --no-index /dev/null audit/normalize.go || \
true'

prefer_discover_semedit prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency46.70s123.46s+164.3%62.61s75.23s+20.1%
Process Start → First Event0.12s0.13s—0.12s0.12s—
First Event → First Tool Call6.17s8.88s—8.30s5.34s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles620+233.3%611+83.3%
Initial Load / Discovery Turns23+50.0%21-50.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)620+233.3%611+83.3%
Output Tokens16422554+55.5%20411948-4.6%
Reasoning / Thinking Tokens6911190+72.2%681885+30.0%
Total Input Tokens198335606939+206.0%193156349736+81.1%
Cached Input Tokens175360563968+221.6%156672319744+104.1%
Uncached Input Tokens2297542971+87.0%3648429992-17.8%
Cost0.13040.2952+126.3%0.16440.1903+15.8%
Cached vs Uncached Token Ratio7.63:113.12:1+72.0%4.29:110.66:1+148.3%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'README.md' -g '*.go' | head -100"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
printf '\\n--- files ---\\n' && \
rg --files | sort | head -100 && \
printf '\\n--- git status ---\\n' && \
git status --short && \
printf '\\n--- audit files ---\\n' && \
for f in audit/*.go; do printf '\\n### %s\\n' \""'$f"; cat "$f"; done'
✓ ✓
/bin/zsh -lc 'rg --files'
3? ✗
/bin/zsh -lc "cat service/dispatch.go && \
printf '\\n--- sink protocol docs ---\\n' && \
cat docs/audit-sinks.md && \
printf '\\n--- module ---\\n' && \
cat go.mod && \
printf '\\n--- root files ---\\n' && \
rg --files -g 'Makefile' -g 'PROJECT_BRIEF.md' -g 'go.work' -g '*.yml' -g '*.yaml'"
✓ ✓
/bin/zsh -lc 'cat AGENTS.override.md && \
cat docs/audit-sinks.md && \
cat audit/normalize.go'
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '1,30p' service/dispatch.go && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short audit/normalize.go audit/summary.go service/dispatch.go"
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Record"
}
6✓ ✓
/bin/zsh -lc 'go test ./... && \
git diff --check && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --exit-code -- go.mod go.sum'
semedit/semantic_lookup (✓ ✗): resolve NormalizeKind: symbol not found
{
  "symbol": "NormalizeKind"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
8—semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "path": "audit"
}
9—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
10—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
12—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
13—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
14—semedit/semantic_verify (✗ ?): This action was rejected due to unacceptable risk. Reason: Workspace-wide Go verification may format and modify test files, conflicting with the user's explicit prohibition on editing tests; verify only the changed source files or use a read-only check. Do not bypass this rejection through a workaround or indirect execution. Continue with a safer alternative, or carry out checks to prove that the action is authorized or low risk before trying again. Complete unaffected work without asking for confirmation.
{
  "language": "go",
  "path": "."
}
15—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/summary.go"
}
16—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
17—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/normalize.go"
}
18—✓ ✓
/bin/zsh -lc "git status --short && \
git diff --check && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --exit-code -- go.mod go.sum && \
git diff --name-only -- '*_test.go'"
19—✓ ✓
/bin/zsh -lc "git rev-parse --show-toplevel && \
git status --short --untracked-files=all -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum '*_test.go' && \
git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
20—✓ ✓
/bin/zsh -lc 'gofmt -d audit/normalize.go audit/summary.go service/dispatch.go && \
cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git status --short --untracked-files=all -- go.mod go.sum audit/normalize.go audit/summary.go service/dispatch.go audit/*_test.go service/*_test.go metrics legacy'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g '"'!**/*_test.go'"' -g '"'!go.mod'"' -g '"'!go.sum'"'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'go.mod' -g 'go.sum' -g '*.go' | head -180"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
printf '\\n--- tracked files ---\\n' && \
rg --files -g '"'!go.mod'"' -g '"'!go.sum'"' | sort | head -160 && \
printf '\\n--- audit sources ---\\n' && \
for f in audit/*.go; do printf '\\n### %s\\n' \""'$f"; cat "$f"; done'
✓ ✓
/bin/zsh -lc "cat PROJECT_BRIEF.md 2>/dev/null; sed -n '1,240p' audit/normalize.go; sed -n '1,280p' service/dispatch.go; rg -n 'health|probe|Record\\(' --glob '*.go'"
3✓ ✓
/bin/zsh -lc "cat service/dispatch.go && \
printf '\\n--- audit docs ---\\n' && \
cat docs/audit-sinks.md && \
printf '\\n--- status ---\\n' && \
git status --short"
✓ ✓
/bin/zsh -lc "sed -n '1,180p' audit/summary.go; sed -n '1,200p' audit/event.go; sed -n '1,160p' audit/sink.go; sed -n '1,100p' audit/normalize.go; git status --short"
4✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'makefile' -g 'go.work' -g 'go.mod' -g 'README*' | sort && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --check"
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
5? ✗
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '1,40p' service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --no-index /dev/null audit/normalize.go"
semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
6✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test -mod=readonly ./... && \
git diff --check && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
7—semedit/semantic_verify (✗ ?): This action was rejected due to unacceptable risk. Reason: semantic_verify may format and write Go files under the entire audit path, potentially modifying protected tests despite the user's explicit prohibition; use a non-mutating verification scoped to production files instead. Do not bypass this rejection through a workaround or indirect execution. Continue with a safer alternative, or carry out checks to prove that the action is authorized or low risk before trying again. Complete unaffected work withou
{
  "language": "go",
  "path": "audit"
}
8—semedit/semantic_verify (✗ ?): This action was rejected due to unacceptable risk. Reason: The verification may format and write all Go files under service, including protected tests, conflicting with the user's explicit no-test-edits instruction. Do not bypass this rejection through a workaround or indirect execution. Continue with a safer alternative, or carry out checks to prove that the action is authorized or low risk before trying again. Complete unaffected work without asking for confirmation. Report anything that remains blocked,
{
  "language": "go",
  "path": "service"
}
9—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/*_test.go service/*_test.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit service'
10—✓ ✓
/bin/zsh -lc 'go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/*_test.go service/*_test.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit service'
11—✓ ✓
/bin/zsh -lc "sed -n '1,80p' audit/normalize.go && \
sed -n '1,60p' audit/summary.go && \
sed -n '1,50p' service/dispatch.go && \
git status --short && \
git diff --stat && \
git diff -- go.mod go.sum"

prefer_discover_semedit prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency43.13s81.63s+89.3%49.62s80.51s+62.2%
Process Start → First Event0.13s0.12s—0.15s0.14s—
First Event → First Tool Call12.33s12.25s—10.52s5.92s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles515+200.0%514+180.0%
Initial Load / Discovery Turns110%21-50.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)515+200.0%514+180.0%
Output Tokens10931886+72.6%17421821+4.5%
Reasoning / Thinking Tokens308749+143.2%832787-5.4%
Total Input Tokens257512377738+46.7%225980454872+101.3%
Cached Input Tokens234240343296+46.6%202752415744+105.1%
Uncached Input Tokens2327234442+48.0%2322839128+68.5%
Cost0.13430.2049+52.6%0.14090.2344+66.3%
Cached vs Uncached Token Ratio10.07:19.97:1-1.0%8.73:110.63:1+21.7%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README*' -g '*.go' -g 'Makefile' | head -80 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README.md' -g 'normalize.go' -g '*.go' | head -100"
2✓ ✓
/bin/zsh -lc 'ls -la && \
cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat audit/README.md 2>/dev/null || \
true'
✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
printf '\\n--- audit/normalize.go ---\\n' && \
cat audit/normalize.go && \
printf '\\n--- audit/event.go ---\\n' && \
cat audit/event.go && \
printf '\\n--- service/dispatch.go ---\\n' && \
cat service/dispatch.go && \
printf '\\n--- status ---\\n' && \
git status --short"
3✓ ✓
/bin/zsh -lc "find docs -type f -maxdepth 2 -print && \
rg -n \"health|probe|control|Record\\(|NormalizeKind\" --glob '"'!**/*_test.go'"' . && \
cat docs/* 2>/dev/null"
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
4✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
cat service/dispatch_test.go && \
cat audit/summary_test.go && \
find . -maxdepth 2 -type f | sort'
✓ ✓
/bin/zsh -lc "cat audit/sink.go && \
printf '\\n--- metrics/writer.go ---\\n' && \
cat metrics/writer.go && \
printf '\\n--- legacy/export.go ---\\n' && \
cat legacy/export.go"
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go service/dispatch_test.go audit/*_test.go go.mod go.sum'
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "path": "audit"
}
6—✓ ✓
/bin/zsh -lc 'cat audit/summary.go'
7—semedit/semantic_replace_body (✓ ✓)
{
  "auto_organize_imports": false,
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
8—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "auto_organize_imports": false,
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
10—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/summary.go"
}
11—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
12—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/normalize.go"
}
13—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum audit/*_test.go service/*_test.go && \
git status --short -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum audit service'
14—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/summary.go && \
git status --short && \
git diff --no-ext-diff -- audit/normalize.go service/dispatch.go audit/summary.go'
15—✓ ✓
/bin/zsh -lc 'go build ./...'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS*' -g 'go.mod' -g '*.go' audit"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'go.mod' -g 'audit/**' | sort && \
git status --short"
2✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'Makefile' -g 'AGENTS*' -g '*.go' | sort && \
git status --short && \
git diff -- audit go.mod go.sum && \
cat audit/normalize.go && \
rg -n \"func \\(.*\\) Record|Record\\(|health|probe|control\" audit"
✓ ✓
/bin/zsh -lc "sed -n '1,220p' audit/normalize.go && \
rg -n 'func \\(.*\\) Record|Dispatcher|health|probe|NormalizeKind' audit"
3✓ ✓
/bin/zsh -lc "cat audit/summary.go && \
cat audit/normalize.go && \
cat audit/event.go && \
cat service/dispatch.go && \
rg -n \"Dispatcher|Classify\\(|Kind\""
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Classify"
}
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Record"
}
5✓ ✓
/bin/zsh -lc 'git diff --check -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "path": "audit"
}
6—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
8—semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—? ✗
/bin/zsh -lc "git diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum && \
sed -n '1,220p' Makefile && \
git status --short -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum"
12—✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'go.mod' -g 'go.sum' -g '*.go' | sort | head -80 && \
git status --short -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum && \
git diff --no-ext-diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum"
13—✓ ✓
/bin/zsh -lc "sed -n '1,80p' audit/normalize.go && \
sed -n '1,80p' audit/summary.go && \
sed -n '1,80p' service/dispatch.go && \
git rev-parse --show-toplevel && \
git status --short | head -30"
14—✓ ✓
/bin/zsh -lc 'go test ./...'

prefer_discover_semedit prompt · descriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsdescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency51.16s133.28s+160.5%50.32s131.54s+161.4%
Process Start → First Event0.13s0.13s—0.14s0.13s—
First Event → First Tool Call8.44s8.19s—11.95s14.07s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles817+112.5%618+200.0%
Initial Load / Discovery Turns220%02—
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)817+112.5%618+200.0%
Output Tokens15272153+41.0%15422574+66.9%
Reasoning / Thinking Tokens347794+128.8%5321017+91.2%
Total Input Tokens258977365286+41.0%283944529644+86.5%
Cached Input Tokens238080327168+37.4%256512486912+89.8%
Uncached Input Tokens2089738118+82.4%2743242732+55.8%
Cost0.13520.2139+58.2%0.15860.2734+72.4%
Cached vs Uncached Token Ratio11.39:18.58:1-24.7%9.35:111.39:1+21.9%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS*' -g 'README.md' -g '*.go' audit"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'go.mod' -g 'go.sum' -g 'audit/**' -g 'Makefile'"
2✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS*' -g 'README.md' -g 'Makefile' -g '*.go' | head -100"
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS*.md' -g 'go.mod' -g 'go.sum' -g 'Makefile'"
3? ✗
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat service/dispatch.go && \
cat Makefile && \
git status --short'
semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
4✓ ✓
/bin/zsh -lc "cat audit/sink.go && \
cat audit/summary.go && \
rg -n 'health|probe|control|Dispatcher|Record' ."
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "language": "go",
  "path": "audit"
}
5✓ ✓
/bin/zsh -lc "find . -maxdepth 2 -type f -not -path './.git/*' -print"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
6✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path

def atomic_write(path, content):
    p = Path(path)
    tmp = p.with_suffix(p.suffix + '.tmp')
    with tmp.open('w') as f:
        f.write(content)
        f.flush()
        import os
        os.fsync(f.fileno())
    tmp.replace(p)

atomic_write('audit/normalize.go', '''// Package audit normalizes event kinds at the audit delivery boundary.
package audit

import (
\\t\"strings\"
)

func NormalizeKind(kind string) string {
\\treturn strings.ToLower(strings.TrimSpace(kind))
}
''')
atomic_write('audit/summary.go', '''// Package audit groups delivery kinds for operational reporting.
package audit

func Classify(kind string) string {
\\tswitch NormalizeKind(kind) {
\\tcase \"health\", \"probe\":
\\t\\treturn \"control\"
\\tdefault:
\\t\\treturn \"data\"
\\t}
}
''')
atomic_write('service/dispatch.go', '''// Package service coordinates application work with the configured audit sink.
package service

import \"example.com/auditapp/audit\"

type Dispatcher struct {
\\tsink audit.Sink
}

func NewDispatcher(sink audit.Sink) *Dispatcher {
\\treturn &Dispatcher{sink: sink}
}

func (d *Dispatcher) Record(event audit.Event) error {
\\tevent.Kind = audit.NormalizeKind(event.Kind)
\\treturn d.sink.Write(event)
}

func DispatchAll(sink audit.Sink, events []audit.Event) error {
\\twriteEvent := audit.Sink.Write
\\tfor _, event := range events {
\\t\\tif err := writeEvent(sink, event); err "'!= nil {
'"\\t\\t\\treturn err
\\t\\t}
\\t}
\\treturn nil
}
''')
PY

gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go
git status --short"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
7✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '10,24p' service/dispatch.go && \
git rev-parse --show-toplevel && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go && \
ls"
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
8✓ ✓
/bin/zsh -lc 'go test ./... && \
git diff --exit-code -- go.mod go.sum && \
gofmt -d audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short'
semedit/semantic_replace_body (✓ ✓)
{
  "auto_organize_imports": true,
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
10—✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'makefile' -g 'go.work' -g '*_test.go'"
11—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- go.mod go.sum && \
git diff --stat'
12—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
13—✓ ✓
/bin/zsh -lc 'go test -mod=readonly ./...'
14—✓ ✓
/bin/zsh -lc 'git status --short -- audit/normalize.go service/dispatch.go audit/summary.go audit/*_test.go service/*_test.go go.mod go.sum && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go audit/*_test.go service/*_test.go go.mod go.sum'
15—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
16—semedit/semantic_inspect_symbol (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
17—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "language": "go",
  "symbol": "NormalizeKind"
}
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README*' -g '*.go' | head -100 && \
git status --short && \
rg -n \"func \\(.*\\) Record|probe|health|Dispatcher\" audit"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'tools/benchmark-harness/README.md' -g 'audit/**' -g 'AGENTS.md' -g 'AGENTS.override.md' -g '"'!go.mod'"' -g '"'!go.sum'"'"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md; rg --files -g 'PROJECT_BRIEF.md' -g 'README.md'; cat audit/normalize.go; cat audit/summary.go; cat audit/event.go; cat audit/sink.go; rg -n \"Record\\(\" --glob '*.go'"
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'tools/benchmark-harness/README.md' -g 'README.md' -g 'AGENTS*' -g '"'!go.mod'"' -g '"'!go.sum'"'"
3✓ ✓
/bin/zsh -lc "cat service/dispatch.go; cat audit/summary_test.go; cat service/dispatch_test.go; cat Makefile 2>/dev/null || \
true; rg -n \"probe|normalize|audit\" --glob '*.md' --glob '*.go'"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
6✓ ✓
/bin/zsh -lc "cat audit/normalize.go; cat audit/summary.go; sed -n '10,20p' service/dispatch.go; git rev-parse --show-toplevel; git status --short --untracked-files=all | rg 'audit/(normalize|summary)\\.go|service/dispatch\\.go|go\\.(mod|sum)' || \
true"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Dispatcher"
}
8—semedit/semantic_batch (✓ ✗): { "status": "error", "results": [ { "tool": "semantic_insert_function", "status": "ok" }, { "tool": "semantic_replace_body", "status": "error", "error": "replace_body Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790519792998770000/service/dispatch.go: symbol not found" } ], "final_diff": "--- a/audit/normalize.go\n+++ b/audit/normalize.go\n // Package audit leaves room for normalization rules owned b
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
9—✓ ✓
/bin/zsh -lc 'rg --files docs audit service'
10—✓ ✓
/bin/zsh -lc "python3 -c 'from pathlib import Path; import os, tempfile; p=Path(\"docs/SUBOPTIMAL_TOOLS.md\"); p.parent.mkdir(parents=True, exist_ok=True); old=p.read_text() if p.exists() else \"# Suboptimal Tool Behavior\\n\"; entry=\"\\n## semantic_batch selector error\\n\\n- Tool: "'`semantic_batch` with `semantic_replace_body`.'"\\n- Target: "'`service/dispatch.go`, method `Dispatcher.Record`.'"\\n- Observed failure: the batch inserted "'`NormalizeKind` successfully, then the body replacement failed because the unqualified `Record` selector did not resolve a receiver method.'"\\n- Workaround: use the receiver-qualified method selector and continue the remaining semantic edits.\\n- Root cause: the replacement tool requires the Go receiver-qualified method name for methods.\\n\"; data=(old.rstrip()+\"\\n\"+entry).encode(); fd,tmp=tempfile.mkstemp(dir=str(p.parent), prefix=\".SUBOPTIMAL_TOOLS.\"); f=os.fdopen(fd,\"wb\"); f.write(data); f.flush(); os.fsync(f.fileno()); os.replace(tmp,p); os.utime(p,None)'"
11—semedit/semantic_organize_imports (✓ ✓)
{
  "file": "audit/normalize.go"
}
12—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
13—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
14—✓ ✓
/bin/zsh -lc 'git diff --check && \
git status --short && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go docs/SUBOPTIMAL_TOOLS.md'
15—semedit/semantic_verify (✓ ✓)
{
  "path": "audit"
}
16—✓ ✓
/bin/zsh -lc 'git diff --check -- audit/normalize.go service/dispatch.go audit/summary.go && \
git status --short -- audit/normalize.go service/dispatch.go audit/summary.go docs/SUBOPTIMAL_TOOLS.md go.mod go.sum'
17—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "language": "go",
  "symbol": "NormalizeKind"
}
18—semedit/semantic_verify (✓ ✓)
{
  "path": "service"
}

prefer_discover_semedit prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency54.34s138.45s+154.8%50.45s87.84s+74.1%
Process Start → First Event0.12s0.12s—0.12s0.13s—
First Event → First Tool Call11.27s10.06s—11.36s7.93s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles817+112.5%612+100.0%
Initial Load / Discovery Turns12+100.0%110%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)817+112.5%612+100.0%
Output Tokens19352744+41.8%12601545+22.6%
Reasoning / Thinking Tokens8681421+63.7%392634+61.7%
Total Input Tokens383227500238+30.5%293576304021+3.6%
Cached Input Tokens353024463360+31.3%268800275456+2.5%
Uncached Input Tokens3020336878+22.1%2477628565+15.3%
Cost0.19880.2601+30.8%0.14980.1675+11.8%
Cached vs Uncached Token Ratio11.69:112.56:1+7.5%10.85:19.64:1-11.1%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'README*' -g '*.go' | head -200 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'audit/**' | head -80 && \
git status --short"
2✓ ✓
/bin/zsh -lc 'cat AGENTS.override.md && \
cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go'
? ✗
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'go.mod' -g 'go.sum' | sort | head -80 && \
cat PROJECT_BRIEF.md 2>/dev/null && \
cat audit/normalize.go"
3✓ ✓
/bin/zsh -lc "cat metrics/writer.go && \
cat legacy/export.go && \
cat service/dispatch_test.go && \
cat audit/event_test.go && \
cat go.mod && \
rg -n \"health|probe|control|Record\\(\" --glob '"'!go.mod'"' --glob '"'!go.sum'"' ."
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat audit/summary_test.go && \
rg --files'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
ls -la'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
6✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
7✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go audit/*_test.go service/*_test.go go.mod go.sum && \
git diff --check -- audit/normalize.go audit/summary.go service/dispatch.go'
semedit/semantic_insert_function (✓ ✓)
{
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
8✓ ✓
/bin/zsh -lc 'git rev-parse --show-toplevel && \
git status --short --untracked-files=all && \
git check-ignore -v audit/normalize.go'
semedit/semantic_replace_body (✓ ✓)
{
  "auto_organize_imports": true,
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
10—semedit/semantic_verify (✓ ✓)
{
  "path": "audit/normalize.go"
}
11—semedit/semantic_verify (✓ ✓)
{
  "path": "audit/summary.go"
}
12—semedit/semantic_verify (✓ ✓)
{
  "path": "service/dispatch.go"
}
13—✓ ✓
/bin/zsh -lc "git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit go.mod go.sum service && \
git status --short -- 'audit/*_test.go' 'service/*_test.go'"
14—✓ ✓
/bin/zsh -lc 'git rev-parse --show-toplevel && \
git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go || \
true && \
git status --short --untracked-files=all -- audit service go.mod go.sum && \
rg --files audit service | sort'
15—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "language": "go",
  "symbol": "NormalizeKind"
}
16—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
17—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'README.md' -g '*.go' audit | head -200 && \
git status --short"
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'audit/*.go' -g 'README.md' | head -80"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
rg -n \"type Dispatcher|func \\(.*Dispatcher.*Record|Record\\(|health|probe|control\" --glob '*.go' ."
✓ ✓
/bin/zsh -lc "rg -n \"Dispatcher|Record\\(|probe|health|NormalizeKind|audit\" audit"
3? ✗
/bin/zsh -lc 'cat service/dispatch.go audit/summary.go audit/event.go audit/sink.go && \
cat README.md && \
find . -name AGENTS.md -o -name AGENTS.override.md -o -name PROJECT_BRIEF.md'
✓ ✓
/bin/zsh -lc 'cat PROJECT_BRIEF.md 2>/dev/null; cat audit/normalize.go audit/summary.go audit/transaction.go audit/sink.go'
4✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'go.mod' -g 'go.sum' -g 'AGENTS*' -g 'README*' -g '*test.go' && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go && \
git status --short"
✓ ✓
/bin/zsh -lc "rg --files | sort; rg -n \"type Dispatcher|func \\(.*Dispatcher.*Record|Record\\(\" --glob '*.go' ."
5? ✗
/bin/zsh -lc "git rev-parse --show-toplevel && \
git ls-files audit/normalize.go service/dispatch.go audit/summary.go && \
cat AGENTS.override.md && \
cat go.mod && \
rg --files -g 'Makefile' ."
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go audit/event.go audit/fanout.go docs/audit-sinks.md'
6✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go service/dispatch.go audit/summary.go && \
go test ./...'
semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "file": "audit/normalize.go",
        "placement": "file_end",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
7—✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'makefile' -g 'GNUmakefile'; git status --short; git diff -- go.mod go.sum; git diff -- audit/normalize.go audit/summary.go service/dispatch.go"
8—✓ ✓
/bin/zsh -lc 'go test ./...'
9—semedit/semantic_verify (✗ ?): This action was rejected due to unacceptable risk. Reason: Workspace-wide semantic verification may format and write Go files, potentially modifying tests despite the user’s explicit prohibition; its broad write scope is not authorized. Do not bypass this rejection through a workaround or indirect execution. Continue with a safer alternative, or carry out checks to prove that the action is authorized or low risk before trying again. Complete unaffected work without asking for confirmation. Report anything
{
  "path": "."
}
10—semedit/semantic_verify (✓ ✓)
{
  "path": "audit/normalize.go"
}
11—semedit/semantic_verify (✓ ✓)
{
  "path": "service/dispatch.go"
}
12—semedit/semantic_verify (✓ ✓)
{
  "path": "audit/summary.go"
}

prefer_discover_semedit prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency36.05s164.83s+357.3%60.26s130.12s+115.9%
Process Start → First Event0.12s0.18s—0.13s0.12s—
First Event → First Tool Call7.74s11.35s—8.72s12.17s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles522+340.0%716+128.6%
Initial Load / Discovery Turns12+100.0%21-50.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)522+340.0%716+128.6%
Output Tokens12043504+191.0%13853242+134.1%
Reasoning / Thinking Tokens3731534+311.3%5261693+221.9%
Total Input Tokens185859554799+198.5%288440545656+89.2%
Cached Input Tokens164096513280+212.8%263680503296+90.9%
Uncached Input Tokens2176341519+90.8%2476042360+71.1%
Cost0.11510.2951+156.3%0.15170.2934+93.4%
Cached vs Uncached Token Ratio7.54:112.36:1+64.0%10.65:111.88:1+11.6%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README*' -g '*.go' | head -100 && \
git status --short && \
rg -n 'func \\(.*Record|Record\\(|health|probe|NormalizeKind' audit"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'Makefile' | sort && \
git status --short"
2? ✗
/bin/zsh -lc 'cat AGENTS.override.md && \
cat audit/normalize.go && \
cat audit/event.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
cat Makefile'
✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
rg --files -g 'PROJECT_BRIEF.md' -g '"'!vendor'"' | head -20"
3✓ ✓
/bin/zsh -lc "rg --files -g '"'!*.sum'"' -g '"'!*.mod'"' -g '"'!AGENTS.override.md'"' && \
cat audit/sink.go && \
cat audit/summary_test.go && \
cat service/dispatch_test.go && \
cat go.mod"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_inspect_symbol (✓ ✗): resolve Dispatcher.Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790517187432801000/audit/sink.go: symbol not found
{
  "file": "audit/sink.go",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/*_test.go service/*_test.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/*_test.go service/*_test.go && \
git diff --check -- audit/normalize.go audit/summary.go service/dispatch.go'
semedit/semantic_inspect_symbol (✓ ✗): param "symbol" is required: invalid operation parameters
{
  "file": "audit/normalize.go",
  "language": "go",
  "symbol": ""
}
6—✓ ✓
/bin/zsh -lc 'rg --files | sort | head -120'
7—semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher"
}
8—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
9—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
10—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat docs/audit-sinks.md'
11—✓ ✓
/bin/zsh -lc "python3 -c 'import os,tempfile,time; p=\"docs/SUBOPTIMAL_TOOLS.md\"; data=\"\"\"# Suboptimal tool behavior\\n\\n- Tool: "'`semantic_inspect_symbol`'"\\n- Target: "'`audit/sink.go` and `audit/normalize.go`'"\\n- Observed failure: lookup failed because "'`Dispatcher.Record` is in `service/dispatch.go`; a second inspection omitted the required symbol argument.'"\\n- Workaround: located the dispatcher with "'`semantic_lookup` and inspected its actual declaration.'"\\n- Root cause: assumed the dispatcher was in the sink file and issued an empty-symbol inspection.\\n\"\"\"; fd,tmp=tempfile.mkstemp(dir=os.path.dirname(p),prefix=\".suboptimal-\"); f=os.fdopen(fd,\"w\"); f.write(data); f.flush(); os.fsync(f.fileno()); f.close(); os.replace(tmp,p); os.utime(p,None)'"
12—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
13—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
14—semedit/semantic_replace_body (✓ ✓)
{
  "auto_organize_imports": true,
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
15—✓ ✓
/bin/zsh -lc "git diff -- go.mod go.sum '*_test.go' && \
git status --short && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go docs/SUBOPTIMAL_TOOLS.md"
16—✓ ✓
/bin/zsh -lc 'go test ./...'
17—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
18—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/summary.go"
}
19—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/normalize.go"
}
20—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "language": "go",
  "symbol": "NormalizeKind"
}
21—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
22—✓ ✓
/bin/zsh -lc 'git status --short --untracked-files=all -- audit service docs go.mod go.sum && \
git check-ignore -v audit/normalize.go service/dispatch.go docs/SUBOPTIMAL_TOOLS.md || \
true'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'AGENTS*' -g 'Makefile' -g 'go.mod' -g 'go.sum' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'go.mod' -g 'Makefile' | sort && \
git status --short"
2✓ ✓
/bin/zsh -lc "git status --short && \
cat audit/normalize.go && \
sed -n '1,240p' audit/event.go && \
rg -n \"Record\\(|probe|health|control\" audit --glob '*.go'"
semedit/semantic_lookup (✓ ✗): read Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790519416721828000/audit: read /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790519416721828000/audit: is a directory
{
  "file": "audit",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
3✓ ✓
/bin/zsh -lc "rg -n \"type Dispatcher|func \\(.*\\) Record|Classify|probe|health\" --glob '*.go' . && \
cat audit/normalize.go && \
cat audit/summary.go && \
cat audit/fanout.go && \
cat audit/sink.go"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "include_unexported": true,
  "path": "audit"
}
4? ✗
/bin/zsh -lc 'cat service/dispatch.go && \
find . -maxdepth 2 -name PROJECT_BRIEF.md -print && \
cat Makefile 2>/dev/null'
✓ ✓
/bin/zsh -lc "rg --files -g 'SUBOPTIMAL_TOOLS.md' -g 'PROJECT_BRIEF.md' -g 'docs/**' | sort"
5✓ ✓
/bin/zsh -lc 'ls -la && \
cat Makefile 2>/dev/null || \
true && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
6✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_inspect_symbol (✓ ✗): read Dispatcher in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790519416721828000/audit: read /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790519416721828000/audit: is a directory
{
  "file": "audit",
  "language": "go",
  "symbol": "Dispatcher"
}
7✓ ✓
/bin/zsh -lc "git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- go.mod go.sum audit/normalize.go audit/summary.go service/dispatch.go && \
rg -n \"func NormalizeKind|func \\(d \\*Dispatcher\\) Record|func Classify\" audit service"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "include_unexported": true,
  "path": "."
}
8—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
9—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
10—✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat AGENTS.override.md'
11—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "auto_organize_imports": true,
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
12—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
13—✓ ✓
/bin/zsh -lc 'go test ./...'
14—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "language": "go",
  "symbol": "NormalizeKind"
}
15—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
16—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}

prefer_discover_semedit prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency48.52s108.66s+124.0%46.79s85.08s+81.8%
Process Start → First Event0.13s0.15s—0.13s0.13s—
First Event → First Tool Call9.16s10.38s—6.61s14.35s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles517+240.0%712+71.4%
Initial Load / Discovery Turns13+200.0%20-100.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)517+240.0%712+71.4%
Output Tokens12351958+58.5%17461793+2.7%
Reasoning / Thinking Tokens273633+131.9%427813+90.4%
Total Input Tokens138260518732+275.2%153130409096+167.2%
Cached Input Tokens122368473600+287.0%128256376576+193.6%
Uncached Input Tokens1589245132+184.0%2487432520+30.7%
Cost0.08920.2636+195.6%0.12140.2080+71.3%
Cached vs Uncached Token Ratio7.70:110.49:1+36.3%5.16:111.58:1+124.6%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'go.mod' -g 'go.sum' -g '*.go' | head -100"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'README.md' -g 'normalize.go' -g '*.go' | head -100 && \
git status --short"
2✓ ✓
/bin/zsh -lc 'cat AGENTS.override.md && \
cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat service/dispatch.go && \
cat audit/summary.go && \
git status --short'
✓ ✓
/bin/zsh -lc "cat PROJECT_BRIEF.md 2>/dev/null; rg --files -g 'AGENTS.md' -g 'AGENTS.override.md'"
3? ✗
/bin/zsh -lc 'cat audit/event_test.go && \
cat audit/summary_test.go && \
cat service/dispatch_test.go && \
cat go.mod && \
rg -n "probe|Classify|NormalizeKind|verification|check" README.md **/README.md Makefile 2>/dev/null'
✓ ✓
/bin/zsh -lc 'cat AGENTS.override.md'
4✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

updates = {
    Path('audit/normalize.go'): '''// Package audit owns normalization rules at the event delivery boundary.
package audit

import (
\\t\"strings\"
)

func NormalizeKind(kind string) string {
\\treturn strings.ToLower(strings.TrimSpace(kind))
}
''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.
package audit

func Classify(kind string) string {
\\tswitch NormalizeKind(kind) {
\\tcase \"health\", \"probe\":
\\t\\treturn \"control\"
\\tdefault:
\\t\\treturn \"data\"
\\t}
}
''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.
package service

import \"example.com/auditapp/audit\"

type Dispatcher struct {
\\tsink audit.Sink
}

func NewDispatcher(sink audit.Sink) *Dispatcher {
\\treturn &Dispatcher{sink: sink}
}

func (d *Dispatcher) Record(event audit.Event) error {
\\tevent.Kind = audit.NormalizeKind(event.Kind)
\\treturn d.sink.Write(event)
}

func DispatchAll(sink audit.Sink, events []audit.Event) error {
\\twriteEvent := audit.Sink.Write
\\tfor _, event := range events {
\\t\\tif err := writeEvent(sink, event); err "'!= nil {
'"\\t\\t\\treturn err
\\t\\t}
\\t}
\\treturn nil
}
'''
}
for path, content in updates.items():
    fd, name = tempfile.mkstemp(dir=path.parent, prefix=path.name + '.')
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(name, path)
    finally:
        if os.path.exists(name):
            os.unlink(name)
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go
go test ./..."
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "path": "audit"
}
5✓ ✓
/bin/zsh -lc 'git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --no-ext-diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
cat audit/normalize.go'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
6—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/event.go",
  "language": "go",
  "symbol": "Event"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
8—semedit/semantic_lookup (✓ ✗): resolve health in audit/summary.go: symbol not found
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "health"
}
9—semedit/semantic_inspect_symbol (✓ ✗): resolve NormalizeKind in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790517756961474000/audit/normalize.go: symbol not found
{
  "file": "audit/normalize.go",
  "language": "go",
  "symbol": "NormalizeKind"
}
10—✓ ✓
/bin/zsh -lc 'rg --files'
11—semedit/semantic_batch (✓ ✓)
{
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "auto_organize_imports": true,
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
12—semedit/semantic_organize_imports (✓ ✓)
{
  "file": "audit/normalize.go"
}
13—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
14—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/*_test.go service/*_test.go metrics legacy && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/*_test.go service/*_test.go metrics legacy'
15—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "language": "go",
  "symbol": "NormalizeKind"
}
16—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
17—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'go.mod' -g 'go.sum' -g 'Makefile' -g 'README*' | sort && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README.md' -g 'normalize.go' -g '*dispatcher*' -g 'Makefile' | head -80 && \
git status --short"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
printf '\\n--- audit/normalize.go ---\\n' && \
cat audit/normalize.go && \
printf '\\n--- audit/event.go ---\\n' && \
cat audit/event.go && \
printf '\\n--- audit/sink.go ---\\n' && \
cat audit/sink.go && \
printf '\\n--- project files ---\\n' && \
rg --files | sort"
✓ ✓
/bin/zsh -lc "cat AGENTS.override.md; if [ -f PROJECT_BRIEF.md ]; then cat PROJECT_BRIEF.md; fi; rg --files audit | sort; rg -n \"func \\(.*\\) Record|probe|health|Dispatcher\" audit"
3✓ ✓
/bin/zsh -lc "cat service/dispatch.go && \
printf '\\n--- dispatch tests ---\\n' && \
cat service/dispatch_test.go && \
printf '\\n--- references ---\\n' && \
rg -n -i 'probe|health|Record\\(|control' . -g '*.go' -g '*.md' && \
printf '\\n--- go.mod (read only) ---\\n' && \
cat go.mod"
✓ ✓
/bin/zsh -lc "rg --files | head -100; rg -n \"Record\\(|type Dispatcher|probe|Classify\\(\" --glob '*.go'"
4✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat audit/summary_test.go && \
cat metrics/writer.go && \
cat legacy/export.go'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile, time

updates = {
    Path('audit/normalize.go'): '''// Package audit owns normalization rules at the delivery boundary.\\npackage audit\\n\\nimport (\\n\\t\"strings\"\\n)\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
}
for path, content in updates.items():
    fd, temp_name = tempfile.mkstemp(prefix=f'.{path.name}.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(temp_name, path)
        now = time.time_ns()
        os.utime(path, ns=(now, now))
    except BaseException:
        try:
            os.unlink(temp_name)
        except FileNotFoundError:
            pass
        raise
PY
"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
6✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
go test ./...'
semedit/semantic_outline (✓ ✓)
{
  "path": "audit/normalize.go"
}
7✓ ✓
/bin/zsh -lc "git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '10,20p' service/dispatch.go"
semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
8—semedit/semantic_verify (✓ ✓)
{
  "path": "audit"
}
9—semedit/semantic_verify (✓ ✓)
{
  "path": "service"
}
10—✓ ✓
/bin/zsh -lc 'go test ./...'
11—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go; git status --short -- audit/normalize.go audit/summary.go service/dispatch.go audit service go.mod go.sum'
12—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go; cat audit/summary.go; cat service/dispatch.go; git status --short --untracked-files=all'

prefer_discover_semedit prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency41.15s64.71s+57.3%44.47s89.54s+101.4%
Process Start → First Event0.12s0.12s—0.13s0.14s—
First Event → First Tool Call9.00s8.89s—6.27s10.04s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles513+160.0%913+44.4%
Initial Load / Discovery Turns14+300.0%43-25.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)513+160.0%913+44.4%
Output Tokens14641413-3.5%14231641+15.3%
Reasoning / Thinking Tokens547519-5.1%440587+33.4%
Total Input Tokens224020284137+26.8%215301429183+99.3%
Cached Input Tokens200704251648+25.4%191488397824+107.8%
Uncached Input Tokens2331632489+39.3%2381331359+31.7%
Cost0.13360.1683+26.0%0.13070.2057+57.4%
Cached vs Uncached Token Ratio8.61:17.75:1-10.0%8.04:112.69:1+57.8%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'Makefile' -g 'audit/**' | sort && \
git status --short && \
rg -n \"func \\(.*\\) Record|Record\\(|probe|health\" audit"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'Makefile' -g 'go.mod' -g '"'!**/*_test.go'"' | head -80"
2? ✗
/bin/zsh -lc "rg --files | sort | head -100 && \
cat audit/normalize.go && \
cat audit/summary.go && \
rg -n \"type Dispatcher|func .*Record|audit\\.Classify|Classify\\(\" . -g '*.go' -g '"'!**/*_test.go'"' && \
cat Makefile"
✓ ✓
/bin/zsh -lc 'git status --short'
3✓ ✓
/bin/zsh -lc "cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat docs/audit-sinks.md && \
cat go.mod && \
git status --short -- . ':"'!go.mod'"' ':"'!go.sum'"'"
✓ ✓
/bin/zsh -lc 'rg --files'
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff --check && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat go.mod'
5✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '10,23p' service/dispatch.go && \
git status --short --untracked-files=all -- audit service && \
git diff --no-ext-diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go || \
true"
semedit/semantic_outline (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
6—semedit/semantic_outline (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
7—semedit/semantic_outline (✓ ✓)
{
  "language": "go",
  "path": "audit/normalize.go"
}
8—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Record"
}
9—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
10—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
11—✓ ✓
/bin/zsh -lc 'go test ./...'
12—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
13—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum metrics legacy && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum metrics legacy'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS*.md' -g 'go.mod' -g 'go.sum' -g 'audit/**' -g 'Makefile' -g 'README*' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README*' -g 'AGENTS.md' -g 'AGENTS.override.md' -g '"'!vendor'"' && \
git status --short && \
rg --files audit"
2✓ ✓
/bin/zsh -lc 'cat AGENTS.override.md'
? ✗
/bin/zsh -lc "cat tools/benchmark-harness/README.md && \
cat audit/normalize.go && \
rg -n 'func \\(.*\\) Record|func .*Record|probe|health|control' audit"
3✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/event.go && \
rg -n \"Record\\(|health|probe|control\" audit"
✓ ✓
/bin/zsh -lc "ls -la && \
cat audit/normalize.go && \
rg -n 'func \\(.*\\) Record|func .*Record|probe|health|control' audit"
4? ✗
/bin/zsh -lc 'git status --short && \
cat go.mod && \
rg -n "make check|go test|verify" Makefile'
? ✗
/bin/zsh -lc "rg -n 'type Dispatcher|func \\(.*Dispatcher.*Record|Record\\(' audit"
5✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
cat audit/sink.go && \
rg -n \"type Dispatcher|func \\(.*Record|Record\\(\" . --glob '"'!**/*_test.go'"'"
✓ ✓
/bin/zsh -lc 'cat audit/event.go audit/sink.go audit/summary.go audit/transaction.go audit/fanout.go'
6✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
find . -maxdepth 2 -type f | sort'
✓ ✓
/bin/zsh -lc 'rg --files | sort'
7✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- go.mod go.sum'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8✓ ✓
/bin/zsh -lc "cat audit/normalize.go; cat audit/summary.go; sed -n '8,24p' service/dispatch.go; git status --short"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
9✓ ✓
/bin/zsh -lc 'go test ./...'
semedit/semantic_outline (✓ ✓)
{
  "path": "audit/normalize.go"
}
10—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
11—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
12—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
13—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go service/dispatch.go audit/summary.go && \
git status --short && \
go test ./...'

prefer_discover_semedit prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency49.99s75.93s+51.9%44.76s168.26s+275.9%
Process Start → First Event0.13s0.12s—0.12s0.13s—
First Event → First Tool Call13.82s7.99s—5.50s12.02s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles413+225.0%723+228.6%
Initial Load / Discovery Turns00—13+200.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)413+225.0%723+228.6%
Output Tokens15581931+23.9%14043788+169.8%
Reasoning / Thinking Tokens718933+29.9%5031446+187.5%
Total Input Tokens228965283286+23.7%191467733767+283.2%
Cached Input Tokens204800249856+22.0%176896684288+286.8%
Uncached Input Tokens2416533430+38.3%1457149479+239.6%
Cost0.14010.1818+29.8%0.10450.3602+244.7%
Cached vs Uncached Token Ratio8.48:17.47:1-11.8%12.14:113.83:1+13.9%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 9 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS*.md' -g 'README.md' -g '*.go' | head -100 && \
git status --short && \
rg -n \"func \\(.*\\) Record|probe|health|Dispatcher\" audit"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'go.mod' -g 'audit/**' -g '*dispatch*' | sort"
2? ✗
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat service/dispatch.go && \
cat go.mod && \
rg --files -g 'Makefile' -g 'README.md' -g 'PROJECT_BRIEF.md'"
✓ ✓
/bin/zsh -lc 'rg --files | sort | head -120 && \
git status --short && \
cat AGENTS.override.md && \
if [ -f PROJECT_BRIEF.md ]; then cat PROJECT_BRIEF.md; fi'
3✓ ✓
/bin/zsh -lc "cat audit/summary_test.go && \
cat audit/event_test.go && \
cat service/dispatch_test.go && \
rg -n \"Classify\\(|Record\\(\" --glob '*.go' . && \
ls -la"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'gofmt -d audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
5—semedit/semantic_inspect_symbol (✓ ✗): param "symbol" is required: invalid operation parameters
{
  "file": "audit/normalize.go",
  "symbol": ""
}
6—✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat go.mod'
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—semedit/semantic_inspect_symbol (✓ ✗): resolve NormalizeKind in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790516982134538000/audit/normalize.go: symbol not found
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
9—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/event.go",
  "symbol": "Event"
}
10—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "auto_organize_imports": true,
        "file": "audit/normalize.go",
        "source": "// NormalizeKind trims surrounding whitespace and lowercases an audit event kind.\nfunc NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
11—? ✗
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/event_test.go audit/summary_test.go service/dispatch_test.go && \
make check'
12—semedit/semantic_verify (✓ ✓)
{
  "path": "."
}
13—✓ ✓
/bin/zsh -lc 'go test ./... && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/event_test.go audit/summary_test.go service/dispatch_test.go && \
cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
cat go.mod'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'Makefile' -g '*.go' | sort | head -200"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'normalize.go' -g '*.go' audit"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
printf '\\n--- normalize.go ---\\n' && \
cat audit/normalize.go && \
printf '\\n--- dispatch.go ---\\n' && \
cat service/dispatch.go && \
printf '\\n--- event.go ---\\n' && \
cat audit/event.go && \
printf '\\n--- status ---\\n' && \
git status --short"
✓ ✓
/bin/zsh -lc "rg --files -g '"'!go.sum'"' -g '"'!go.mod'"' | head -60 && \
git status --short && \
git diff -- audit"
3✓ ✓
/bin/zsh -lc "rg -n \"health|probe|control|Record\\(|NormalizeKind|Kind\" --glob '*.go' ."
✓ ✓
/bin/zsh -lc 'cat AGENTS.override.md && \
cat docs/audit-sinks.md'
4✓ ✓
/bin/zsh -lc "cat audit/summary.go audit/sink.go audit/fanout.go audit/transaction.go metrics/writer.go legacy/export.go && \
printf '\\n--- project files ---\\n' && \
rg --files -g 'README*' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'Makefile' | sort"
semedit/semantic_lookup (✓ ✗): resolve NormalizeKind: symbol not found
{
  "symbol": "NormalizeKind"
}
5✓ ✓
/bin/zsh -lc 'gofmt -d audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
6✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
7✓ ✓
/bin/zsh -lc 'cat audit/normalize.go audit/summary.go service/dispatch.go && \
git rev-parse --show-toplevel && \
git status --short'
semedit/report_feedback (✓ ✓)
{
  "command": "semantic_lookup",
  "intent": "Locate the audit normalization function before implementing the requested public API.",
  "interface": "mcp",
  "manual_touchups": "None; the lookup was exploratory and no source change was needed.",
  "observed_result": "The lookup reported that NormalizeKind does not exist.",
  "parameters": {
    "symbol": "NormalizeKind"
  },
  "target_context": "audit/normalize.go",
  "unexpected_reason": "The requested normalization function is not present yet, so the symbol lookup could not return a declaration."
}
8—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
9—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
10—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
11—semedit/semantic_batch (✓ ✗): { "status": "error", "results": [ { "tool": "semantic_replace_body", "status": "error", "error": "replace_body Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_large-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790519184129961000/service/dispatch.go: symbol not found" } ], "final_diff": "" }
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
12—semedit/report_feedback (✓ ✓)
{
  "command": "semantic_batch (semantic_replace_body)",
  "intent": "Normalize event kinds in Dispatcher.Record and classify health and probe as control traffic.",
  "interface": "mcp",
  "manual_touchups": "None yet; the batch stopped before applying any edit.",
  "observed_result": "The semantic replacement could not resolve Record in service/dispatch.go even though semantic inspection had identified Dispatcher.Record.",
  "parameters": {
    "edits": [
      {
        "params": {
          "file": "service/dispatch.go",
          "symbol": "Record"
        },
        "tool": "semantic_replace_body"
      }
    ]
  },
  "target_context": "service/dispatch.go: Dispatcher.Record",
  "unexpected_reason": "The symbol had just been successfully inspected, so the replacement tool should have accepted the receiver-qualified method."
}
13—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
14—? ✗
/bin/zsh -lc "python3 -c 'from pathlib import Path; import os, tempfile; p=Path(\"docs/SUBOPTIMAL_TOOLS.md\"); p.parent.mkdir(parents=True, exist_ok=True); old=p.read_text() if p.exists() else \"# Suboptimal Tool Behavior\\n\"; entry=\"\\n## 2026-09-27: semantic_lookup and semantic_replace_body\\n\\n- Target: "'`audit/normalize.go`, `service/dispatch.go`'"\\n- Observed: "'`semantic_lookup` returned an error because `NormalizeKind` did not yet exist; `semantic_replace_body` could not resolve method `Record` when supplied without its receiver.'"\\n- Workaround: created the missing function using "'`semantic_insert_function`; retried the method replacement as `(*Dispatcher).Record`. Both edits then completed successfully.'"\\n- Root cause: lookup was requested for a symbol before it had been implemented; replacement requires the Go receiver-qualified method selector.\\n\"; data=(old.rstrip()+\"\\n\"+entry).encode(); fd, name=tempfile.mkstemp(dir=p.parent, prefix=\".SUBOPTIMAL_TOOLS.\");\\n' "
15—✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os
import tempfile

path = Path('docs/SUBOPTIMAL_TOOLS.md')
path.parent.mkdir(parents=True, exist_ok=True)
existing = path.read_text() if path.exists() else '# Suboptimal Tool Behavior\\n'
entry = '''
## 2026-09-27: semantic_lookup and semantic_replace_body

- Target: "'`audit/normalize.go`, `service/dispatch.go`
- Observed: `semantic_lookup` returned an error because `NormalizeKind` did not yet exist; `semantic_replace_body` could not resolve method `Record` when supplied without its receiver.
- Workaround: created the missing function using `semantic_insert_function`; retried the method replacement as `(*Dispatcher).Record`. Both edits then completed successfully.
- Root cause: lookup was requested for a symbol before it had been implemented; replacement requires the Go receiver-qualified method selector.
'"'''
data = (existing.rstrip() + '\\n' + entry).encode()
fd, name = tempfile.mkstemp(dir=path.parent, prefix='.SUBOPTIMAL_TOOLS.')
try:
    with os.fdopen(fd, 'wb') as stream:
        stream.write(data)
        stream.flush()
        os.fsync(stream.fileno())
    os.replace(name, path)
    directory = os.open(path.parent, os.O_RDONLY)
    try:
        os.fsync(directory)
    finally:
        os.close(directory)
finally:
    if os.path.exists(name):
        os.unlink(name)
PY"
16—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/normalize.go"
}
17—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/summary.go"
}
18—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
19—✓ ✓
/bin/zsh -lc 'go test -mod=readonly ./...'
20—✓ ✓
/bin/zsh -lc 'git status --short -- audit service docs/SUBOPTIMAL_TOOLS.md go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go docs/SUBOPTIMAL_TOOLS.md go.mod go.sum'
21—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
22—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
23—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}

prefer_discover_semedit prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency33.23s65.42s+96.8%43.43s100.63s+131.7%
Process Start → First Event0.12s0.12s—0.13s0.13s—
First Event → First Tool Call5.56s8.05s—5.13s7.14s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles512+140.0%715+114.3%
Initial Load / Discovery Turns10-100.0%23+50.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)512+140.0%715+114.3%
Output Tokens11621543+32.8%14231609+13.1%
Reasoning / Thinking Tokens350557+59.1%470625+33.0%
Total Input Tokens156623270710+72.8%261139345532+32.3%
Cached Input Tokens136704235520+72.3%236288310784+31.5%
Uncached Input Tokens1991935190+76.7%2485134748+39.8%
Cost0.10290.1731+68.3%0.14490.1925+32.9%
Cached vs Uncached Token Ratio6.86:16.69:1-2.5%9.51:18.94:1-5.9%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' -g 'README*'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'audit/**' -g '*dispatcher*' -g '*.go' | head -100 && \
git status --short"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/sink.go && \
rg -n 'Dispatcher|Record\\(|health|probe|Kind' audit"
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'Makefile' -g 'go.mod' -g 'README*' | sort"
3✓ ✓
/bin/zsh -lc "rg -n 'type Dispatcher|func .*Record|Classify|Dispatcher' . -g '*.go' -g '"'!**/*_test.go'"'; cat audit/summary.go; cat audit/event.go; git status --short; rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'go.mod'"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go; cat audit/summary_test.go; find . -maxdepth 2 -type f | sort'
semedit/semantic_outline (✓ ✓)
{
  "path": "service/dispatch.go"
}
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
6—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
7—✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
rg -n 'probe|health|Classify|Record\\(' --glob '"'!**/*_test.go'"' ."
8—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "file": "audit/normalize.go",
        "placement": "file_end",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "auto_organize_imports": false,
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
9—semedit/semantic_verify (✓ ✓)
{
  "path": "audit"
}
10—semedit/semantic_verify (✓ ✓)
{
  "path": "service"
}
11—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/*_test.go service/*_test.go && \
git status --short'
12—✓ ✓
/bin/zsh -lc 'go build ./...'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile' -g 'README*' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'README*' -g 'go.mod' -g 'go.sum' -g 'audit/**' -g 'Makefile' | sort"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
cat audit/normalize.go && \
sed -n '1,240p' audit/event.go && \
rg -n \"func \\(.*Record|Record\\(|health|probe|control\" audit"
✓ ✓
/bin/zsh -lc "rg --files | sort | sed -n '1,120p'; rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' | sort"
3✓ ✓
/bin/zsh -lc "rg --files -g '"'!go.mod'"' -g '"'!go.sum'"' | sort && \
cat audit/sink.go audit/summary.go audit/fanout.go audit/transaction.go && \
rg -n \"Dispatcher|func .*Record|Classify\" . -g '*.go'"
✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat audit/normalize.go && \
cat AGENTS.override.md'
4? ✗
/bin/zsh -lc 'cat service/dispatch.go docs/audit-sinks.md && \
cat Makefile'
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "symbol": "Record"
}
6✓ ✓
/bin/zsh -lc "git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- go.mod go.sum '*_test.go'"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "symbol": "Dispatcher"
}
7✓ ✓
/bin/zsh -lc "git rev-parse --show-prefix && \
git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go || \
true && \
sed -n '1,30p' audit/normalize.go && \
git diff --no-index /dev/null audit/normalize.go | head -30"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "symbol": "Event"
}
8—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
9—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
10—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
11—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
12—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
13—semedit/semantic_verify (✓ ✓)
{
  "path": "."
}
14—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
15—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git rev-parse --show-toplevel && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go'

prefer_discover_semedit prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency58.72s178.41s+203.8%45.64s116.12s+154.4%
Process Start → First Event0.13s0.12s—0.13s0.12s—
First Event → First Tool Call11.97s13.85s—10.91s10.10s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles622+266.7%512+140.0%
Initial Load / Discovery Turns13+200.0%110%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)622+266.7%512+140.0%
Output Tokens20942678+27.9%14402486+72.6%
Reasoning / Thinking Tokens6721376+104.8%6831352+98.0%
Total Input Tokens286987638416+122.5%255375381232+49.3%
Cached Input Tokens262656590080+124.7%231168348672+50.8%
Uncached Input Tokens2433148336+98.7%2420732560+34.5%
Cost0.16110.3190+98.1%0.14480.2165+49.5%
Cached vs Uncached Token Ratio10.80:112.21:1+13.1%9.55:110.71:1+12.1%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 11 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README*' -g '*.go' | head -100 && \
git status --short && \
rg -n \"func \\(.*\\) Record|probe|health|control\" audit"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'README*' -g 'go.mod' -g '*.go' | head -100"
2? ✗
/bin/zsh -lc 'cat AGENTS.override.md && \
cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat Makefile'
✓ ✓
/bin/zsh -lc 'rg --files'
3✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'README*' -g 'go.mod' -g 'go.sum' -g '*.go' && \
cat go.mod && \
cat audit/summary_test.go && \
cat service/dispatch_test.go"
✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md'
4✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile, time

updates = {
    Path('audit/normalize.go'): '''// Package audit owns normalization at the event delivery boundary.
package audit

import (
\\t\"strings\"
)

// NormalizeKind trims surrounding whitespace and lowercases an event kind.
func NormalizeKind(kind string) string {
\\treturn strings.ToLower(strings.TrimSpace(kind))
}
''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.
package audit

func Classify(kind string) string {
\\tswitch NormalizeKind(kind) {
\\tcase \"health\", \"probe\":
\\t\\treturn \"control\"
\\tdefault:
\\t\\treturn \"data\"
\\t}
}
''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.
package service

import \"example.com/auditapp/audit\"

type Dispatcher struct {
\\tsink audit.Sink
}

func NewDispatcher(sink audit.Sink) *Dispatcher {
\\treturn &Dispatcher{sink: sink}
}

func (d *Dispatcher) Record(event audit.Event) error {
\\tevent.Kind = audit.NormalizeKind(event.Kind)
\\treturn d.sink.Write(event)
}

func DispatchAll(sink audit.Sink, events []audit.Event) error {
\\twriteEvent := audit.Sink.Write
\\tfor _, event := range events {
\\t\\tif err := writeEvent(sink, event); err "'!= nil {
'"\\t\\t\\treturn err
\\t\\t}
\\t}
\\treturn nil
}
''',
}
for path, content in updates.items():
    old_mtime = path.stat().st_mtime_ns if path.exists() else 0
    fd, tmp_name = tempfile.mkstemp(prefix=path.name + '.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(tmp_name, path)
        os.utime(path, ns=(max(time.time_ns(), old_mtime + 1), max(time.time_ns(), old_mtime + 1)))
    except BaseException:
        try:
            os.unlink(tmp_name)
        except FileNotFoundError:
            pass
        raise
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
go test ./..."
semedit/semantic_outline (✓ ✓)
{
  "path": "audit/normalize.go"
}
5✓ ✓
/bin/zsh -lc 'git diff --check && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go audit/summary_test.go service/dispatch_test.go go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --quiet -- go.mod go.sum'
semedit/semantic_outline (✓ ✓)
{
  "path": "service/dispatch.go"
}
6✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
rg -n \"NormalizeKind|NormalizeKind\\(event.Kind\\)\" service/dispatch.go && \
git status --short --untracked-files=all | head -40 && \
git rev-parse --show-toplevel"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
7—semedit/semantic_outline (✓ ✓)
{
  "path": "audit/sink.go"
}
8—semedit/semantic_outline (✓ ✓)
{
  "path": "metrics/writer.go"
}
9—semedit/semantic_outline (✓ ✓)
{
  "path": "audit/summary.go"
}
10—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/event.go",
  "symbol": "Event"
}
12—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
13—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
14—semedit/semantic_replace_body (✓ ✗): replace_body Record in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790517576886265000/service/dispatch.go: symbol not found
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "Record"
}
15—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
16—✓ ✓
/bin/zsh -lc "python3 -c 'from pathlib import Path; p=Path(\"docs/SUBOPTIMAL_TOOLS.md\"); p.parent.mkdir(parents=True, exist_ok=True); content=\"# Suboptimal tool behavior\\n\\n- Tool: "'`semantic_replace_body`'"\\n  Target: "'`service/dispatch.go`'"\\n  Observed failure: Selecting the method by the short symbol "'`Record` did not resolve its receiver method.'"\\n  Workaround: Retried with the receiver-qualified symbol "'`(*Dispatcher).Record`; the semantic edit succeeded.'"\\n  Root cause: The method selector requires a receiver-qualified name in this workspace.\\n\"; tmp=p.with_suffix(p.suffix+\".tmp\"); tmp.write_text(content); f=tmp.open(\"rb\"); import os; os.fsync(f.fileno()); f.close(); os.replace(tmp,p)'"
17—semedit/semantic_verify (✓ ✓)
{
  "path": "audit/normalize.go"
}
18—semedit/semantic_verify (✓ ✓)
{
  "path": "audit/summary.go"
}
19—semedit/semantic_verify (✓ ✓)
{
  "path": "service/dispatch.go"
}
20—semedit/semantic_verify (✓ ✓)
{
  "path": "audit/normalize.go"
}
21—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go docs/SUBOPTIMAL_TOOLS.md'
22—✓ ✓
/bin/zsh -lc 'go test ./...'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 9 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' -g 'AGENTS.md' -g 'AGENTS.override.md' | sort && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README.md' -g 'Makefile' -g '*.go' audit"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
rg --files | sort | head -100 && \
rg -n \"type Dispatcher|func \\(.*\\) Record|health|probe|NormalizeKind\" audit"
? ✗
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README.md' -g 'Makefile' -g '*.go' | head -100 && \
git status --short && \
sed -n '1,240p' audit/normalize.go && \
sed -n '1,260p' audit/dispatcher.go"
3✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat docs/audit-sinks.md'
✓ ✓
/bin/zsh -lc "rg -n \"type Dispatcher|func \\(.*Dispatcher.*Record|health|probe|Record\\(\""
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
go test -mod=readonly ./...'
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go audit/summary.go audit/fanout.go audit/event.go audit/sink.go audit/transaction.go audit/normalize.go audit/summary_test.go service/dispatch_test.go && \
find . -maxdepth 2 -type f | sort'
5✓ ✓
/bin/zsh -lc "git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --no-ext-diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '12,24p' service/dispatch.go"
semedit/semantic_insert_function (✓ ✗): param "file" is required: invalid operation parameters
{}
6—semedit/semantic_replace_body (✓ ✗): param "file" is required: invalid operation parameters
{}
7—semedit/semantic_batch (✓ ✓)
{
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
8—semedit/semantic_organize_imports (✓ ✓)
{
  "file": "audit/normalize.go"
}
9—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
10—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
11—✓ ✓
/bin/zsh -lc "sed -n '1,80p' audit/normalize.go && \
sed -n '1,60p' audit/summary.go && \
sed -n '1,45p' service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --numstat"
12—✓ ✓
/bin/zsh -lc 'git ls-files -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short --untracked-files=all -- audit/normalize.go audit/summary.go service/dispatch.go'

prefer_discover_semedit prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency43.43s243.47s+460.6%55.04s61.11s+11.0%
Process Start → First Event0.13s0.13s—0.12s0.13s—
First Event → First Tool Call5.45s21.57s—11.62s5.93s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles720+185.7%712+71.4%
Initial Load / Discovery Turns220%110%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)720+185.7%712+71.4%
Output Tokens13993153+125.4%15861576-0.6%
Reasoning / Thinking Tokens4451841+313.7%352506+43.8%
Total Input Tokens197286458607+132.5%219416285322+30.0%
Cached Input Tokens178176416768+133.9%201216249856+24.2%
Uncached Input Tokens1911041839+118.9%1820035466+94.9%
Cost0.11540.2712+135.1%0.12000.1772+47.6%
Cached vs Uncached Token Ratio9.32:19.96:1+6.8%11.06:17.04:1-36.3%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 11 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile' | sort"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
rg -n \"Record\\(|health|probe|control\" audit"
✓ ✓
/bin/zsh -lc "git status --short && \
rg --files | rg '("'^|/)(PROJECT_BRIEF'"\\.md|README\\.md|Makefile)"'$|''^audit/'"'"
3✓ ✓
/bin/zsh -lc "rg --files | sort && \
cat audit/summary.go && \
rg -n \"type Dispatcher|func \\(.*Dispatcher|Classify|Record\" . -g '*.go'"
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat docs/audit-sinks.md && \
cat audit/event_test.go && \
cat service/dispatch_test.go && \
cat go.mod'
semedit/semantic_outline (✓ ✗): unknown param "scope"; supported keys are [bash-bin, bash_bin, ghc-bin, ghc-version, ghc_bin, ghc_version, haskell-standalone, hls-bin, hls-version, hls_bin, hls_version, import-maven, import_maven, include-tests, include-unexported, include_tests, include_unexported, java-bin, java-version, java_bin, java_version, jdtls-home, jdtls_home, kind, kinds, kotlin-bin, kotlin_bin, language, make-bin, make_bin, metals-bin, metals-home, metals_bin, metals_home, path, standalone_haskell, trust-workspace, trust_works
{
  "scope": "audit"
}
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --check && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short'
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
6✓ ✓
/bin/zsh -lc "pwd; sed -n '1,30p' audit/normalize.go; sed -n '1,20p' audit/summary.go; sed -n '1,25p' service/dispatch.go; git rev-parse --show-toplevel; git status --short --untracked-files=all -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum; git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
7✓ ✓
/bin/zsh -lc 'go test ./...'
semedit/semantic_lookup (✓ ✗): resolve NormalizeKind: symbol not found
{
  "symbol": "NormalizeKind"
}
8—✓ ✓
/bin/zsh -lc "rg -n 'audit|Dispatcher|probe|health|control' --glob '*.md' --glob '"'!AGENTS.override.md'"' . | head -80"
9—? ✗
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat Makefile'
10—semedit/semantic_inspect_symbol (✓ ✓)
{
  "symbol": "Classify"
}
11—? ✗
/bin/zsh -lc 'make check'
12—semedit/semantic_batch (✓ ✓)
{
  "edits": [
    {
      "params": {
        "file": "audit/normalize.go",
        "source": "// NormalizeKind trims surrounding whitespace and lowercases an audit event kind.\nfunc NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "kind = NormalizeKind(kind)\n\nswitch kind {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "Dispatcher.Record"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
13—semedit/semantic_organize_imports (✓ ✓)
{
  "add": [
    "strings"
  ],
  "file": "audit/normalize.go"
}
14—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
15—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
16—✓ ✓
/bin/zsh -lc 'go test ./...'
17—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go audit/event_test.go audit/summary_test.go service/dispatch_test.go go.mod go.sum'
18—semedit/semantic_inspect_symbol (✓ ✓)
{
  "symbol": "NormalizeKind"
}
19—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
20—semedit/semantic_inspect_symbol (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'README*' -g '*.go' | head -100"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' -g 'docs/**' | head -80"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
git status --short && \
cat audit/normalize.go && \
sed -n '1,240p' audit/fanout.go && \
sed -n '1,260p' service/dispatch.go"
✓ ✓
/bin/zsh -lc "rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'Makefile' -g 'go.mod' -g 'go.sum' | sort && \
git status --short && \
git diff -- audit/normalize.go audit/dispatcher.go"
3✓ ✓
/bin/zsh -lc "rg -n \"health|probe|control|Record\\(|Kind\" --glob '*.go' ."
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4? ✗
/bin/zsh -lc 'cat audit/summary.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat db/db.go && \
cat metrics/metrics.go && \
cat metrics/writer.go && \
cat Makefile'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

changes = {
    Path('audit/normalize.go'): '''// Package audit owns normalization rules at the delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
}
for path, content in changes.items():
    fd, tmp = tempfile.mkstemp(prefix=path.name + '.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(tmp, path)
        dfd = os.open(path.parent, os.O_DIRECTORY)
        try:
            os.fsync(dfd)
        finally:
            os.close(dfd)
    finally:
        if os.path.exists(tmp):
            os.unlink(tmp)
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
go test ./..."
✓ ✓
/bin/zsh -lc "cat docs/audit-sinks.md && \
rg -n 'Dispatcher|probe|health|Record\\(' audit"
6✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go'
7✓ ✓
/bin/zsh -lc 'git diff --no-ext-diff -- audit/normalize.go audit/summary.go service/dispatch.go; git status --short -- .; cat audit/normalize.go; cat service/dispatch.go'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
9—semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "file": "audit/normalize.go",
        "placement": "file_end",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
10—semedit/semantic_verify (✓ ✓)
{
  "path": "audit"
}
11—✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'README*' -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' | sort && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
12—✓ ✓
/bin/zsh -lc 'go test ./... && \
git diff --exit-code -- go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'

prefer_discover_semedit prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency43.75s102.50s+134.3%48.52s95.76s+97.4%
Process Start → First Event0.17s0.13s—0.13s0.12s—
First Event → First Tool Call9.90s10.49s—5.60s7.76s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles518+260.0%715+114.3%
Initial Load / Discovery Turns03—12+100.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)518+260.0%715+114.3%
Output Tokens13661941+42.1%16962198+29.6%
Reasoning / Thinking Tokens460716+55.7%4571063+132.6%
Total Input Tokens259839415835+60.0%174580424031+142.9%
Cached Input Tokens235264364544+55.0%157696389888+147.2%
Uncached Input Tokens2457551291+108.7%1688434143+102.2%
Cost0.14310.2526+76.5%0.10850.2236+106.0%
Cached vs Uncached Token Ratio9.57:17.11:1-25.8%9.34:111.42:1+22.3%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS*.md' -g 'Makefile' -g 'audit/**' -g '"'!go.mod'"' -g '"'!go.sum'"' | sort && \
git status --short && \
rg -n \"func \\(.*\\) Record|probe|health|Dispatcher\" audit --glob '"'!**/*_test.go'"'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'tools/benchmark-harness/README.md' -g 'audit/*.go' -g 'AGENTS.md' -g '"'!go.mod'"' -g '"'!go.sum'"' | sort"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat audit/summary.go && \
rg -n \"func .*Record|Record\\(\" --glob '*.go' -g '"'!**/*_test.go'"' && \
rg -n \"probe|health\" --glob '*.go' -g '"'!**/*_test.go'"' && \
ls -a"
✓ ✓
/bin/zsh -lc "rg --files | rg '("'^|/)(PROJECT_BRIEF'"\\.md|README\\.md|AGENTS\\.md)"'$|''^audit/'"' | sort"
3? ✗
/bin/zsh -lc "cat service/dispatch.go && \
cat docs/README.md 2>/dev/null || \
true && \
rg -n \"make check|go test\" . --glob '*.md' --glob 'Makefile' --glob '"'!go.mod'"' --glob '"'!go.sum'"'"
✓ ✓
/bin/zsh -lc "git status --short && \
rg -n 'func \\(.*\\) Record|probe|health|classif|control' audit"
4✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
5✓ ✓
/bin/zsh -lc "git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
cat audit/normalize.go && \
sed -n '1,20p' audit/summary.go && \
sed -n '10,20p' service/dispatch.go && \
git check-ignore -v audit/normalize.go"
✓ ✓
/bin/zsh -lc "rg --files | sort | head -100 && \
rg -n 'type Dispatcher|func \\(.*Dispatcher.*Record|probe|health' --glob '*.go' --glob '"'!**/*_test.go'"'"
6—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/event.go",
  "symbol": "Event"
}
9—semedit/semantic_insert_function (✓ ✓)
{
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
12—semedit/semantic_verify (✓ ✓)
{
  "path": "."
}
13—✓ ✓
/bin/zsh -lc 'go test ./...'
14—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
15—✓ ✓
/bin/zsh -lc 'git rev-parse --show-prefix && \
git status --short && \
git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum || \
true'
16—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Record"
}
17—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
18—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'go.sum' -g 'audit/**' | sort"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile' | sort && \
git status --short"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
printf '\\n--- normalize.go ---\\n' && \
cat audit/normalize.go && \
printf '\\n--- dispatcher references ---\\n' && \
rg -n -C 4 'func \\(.*Record|Dispatcher|health|probe|control' audit --glob '"'!**/*_test.go'"' && \
printf '\\n--- status ---\\n' && \
git status --short"
✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
if [ -f PROJECT_BRIEF.md ]; then cat PROJECT_BRIEF.md; fi && \
cat audit/normalize.go && \
rg -n \"func \\(.*\\) Record|func .*Record|probe|health|control\" audit"
3✓ ✓
/bin/zsh -lc "rg -n 'Record\\(|type Dispatcher|Classify\\(' . --glob '*.go' --glob '"'!**/*_test.go'"' && \
printf '\\n--- audit/event.go ---\\n' && \
cat audit/event.go && \
printf '\\n--- audit/summary.go ---\\n' && \
cat audit/summary.go && \
printf '\\n--- inventory files ---\\n' && \
rg --files | sort | head -100"
✓ ✓
/bin/zsh -lc "rg --files -g '*.go' | sort && \
rg -n \"Dispatcher|Record\\(\" . -g '*.go'"
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/sink.go && \
cat audit/summary_test.go && \
cat service/dispatch_test.go'
semedit/semantic_outline (✓ ✓)
{
  "path": "audit/summary.go"
}
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

updates = {
    Path('audit/normalize.go'): '''// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit

import (
\\t\"strings\"
)

func NormalizeKind(kind string) string {
\\treturn strings.ToLower(strings.TrimSpace(kind))
}
''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.
package audit

func Classify(kind string) string {
\\tswitch NormalizeKind(kind) {
\\tcase \"health\", \"probe\":
\\t\\treturn \"control\"
\\tdefault:
\\t\\treturn \"data\"
\\t}
}
''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.
package service

import \"example.com/auditapp/audit\"

type Dispatcher struct {
\\tsink audit.Sink
}

func NewDispatcher(sink audit.Sink) *Dispatcher {
\\treturn &Dispatcher{sink: sink}
}

func (d *Dispatcher) Record(event audit.Event) error {
\\tevent.Kind = audit.NormalizeKind(event.Kind)
\\treturn d.sink.Write(event)
}

func DispatchAll(sink audit.Sink, events []audit.Event) error {
\\twriteEvent := audit.Sink.Write
\\tfor _, event := range events {
\\t\\tif err := writeEvent(sink, event); err "'!= nil {
'"\\t\\t\\treturn err
\\t\\t}
\\t}
\\treturn nil
}
''',
}

for path, content in updates.items():
    fd, temp_name = tempfile.mkstemp(prefix=f'.{path.name}.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(temp_name, path)
        dir_fd = os.open(path.parent, os.O_RDONLY)
        try:
            os.fsync(dir_fd)
        finally:
            os.close(dir_fd)
    finally:
        if os.path.exists(temp_name):
            os.unlink(temp_name)
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
"
semedit/semantic_outline (✓ ✓)
{
  "path": "service/dispatch.go"
}
6✓ ✓
/bin/zsh -lc 'go test ./...'
semedit/semantic_outline (✓ ✓)
{
  "path": "audit/normalize.go"
}
7✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
cat audit/event.go'
8—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "kind = NormalizeKind(kind)\nswitch kind {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/normalize.go"
}
12—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
13—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/summary.go"
}
14—✓ ✓
/bin/zsh -lc 'git status --short -- audit/normalize.go audit/summary.go service/dispatch.go audit/event_test.go audit/summary_test.go service/dispatch_test.go go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --exit-code -- go.mod go.sum audit/event_test.go audit/summary_test.go service/dispatch_test.go'
15—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/summary.go && \
git status --short --untracked-files=all -- audit service go.mod go.sum && \
git rev-parse --show-prefix && \
git ls-files -- audit/normalize.go service/dispatch.go audit/summary.go'

prefer_discover_semedit prompt · none MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsnone
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency56.45s77.36s+37.0%52.13s89.25s+71.2%
Process Start → First Event0.12s0.13s—0.13s0.13s—
First Event → First Tool Call13.80s11.00s—5.14s8.48s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles612+100.0%1014+40.0%
Initial Load / Discovery Turns00—20-100.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)612+100.0%1014+40.0%
Output Tokens19331760-8.9%19971100-44.9%
Reasoning / Thinking Tokens586574-2.0%5060-100.0%
Total Input Tokens291760329546+13.0%174286517618+197.0%
Cached Input Tokens265728301312+13.4%157696479488+204.1%
Uncached Input Tokens2603228234+8.5%1659038130+129.8%
Cost0.16300.1751+7.4%0.11220.2289+104.1%
Cached vs Uncached Token Ratio10.21:110.67:1+4.5%9.51:112.58:1+32.3%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'README.md' -g 'go.mod' -g 'go.sum' -g 'normalize.go' -g '*dispatcher*' -g '*audit*' | head -120 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS*' -g 'Dispatcher*' -g '*.go' -g 'go.mod' -g 'go.sum' | head -100 && \
git status --short"
2? ✗
/bin/zsh -lc "cat audit/normalize.go && \
rg -n \"func \\(.*\\) Record|type Dispatcher|health|probe|control\" audit --glob '*.go' && \
cat docs/audit-sinks.md && \
cat Makefile"
✓ ✓
/bin/zsh -lc 'cat AGENTS.override.md && \
rg --files | sort'
3✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'Makefile' -g '*.go' | sort && \
rg -n \"Record\\(\" --glob '*.go'"
✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat audit/normalize.go && \
cat audit/event.go && \
cat service/dispatch.go && \
cat audit/sink.go && \
cat metrics/writer.go && \
cat legacy/export.go'
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go audit/{event.go,sink.go,summary.go} service/dispatch_test.go && \
cat go.mod && \
ls -la'
✓ ✓
/bin/zsh -lc 'rg -n "health|probe|control|Record|Classify|Normalize" .'
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat audit/summary_test.go && \
cat audit/event_test.go && \
cat service/dispatch_test.go && \
cat go.mod'
6✓ ✓
/bin/zsh -lc 'cat audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --stat && \
git status --short'
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
7—semedit/semantic_replace_body (✓ ✓)
{
  "auto_organize_imports": false,
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
8—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
9—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
10—✓ ✓
/bin/zsh -lc 'go test ./...'
11—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum audit/*_test.go service/*_test.go && \
git status --short -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum audit service'
12—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/summary.go && \
git status --short && \
git diff --stat && \
git rev-parse --show-toplevel'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'README*' -g '*.go' -g 'go.mod' -g 'go.sum' | sort | head -200"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README.md' -g 'Makefile' -g 'normalize.go' -g '*dispatcher*' -g '*audit*' | head -100 && \
git status --short"
2✓ ✓
/bin/zsh -lc 'rg --files | sort'
✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
cat docs/audit-sinks.md && \
rg -n 'func \\(.*\\) Record|type Dispatcher|probe|health|Kind' audit"
3✓ ✓
/bin/zsh -lc "git status --short && \
sed -n '1,240p' audit/normalize.go && \
sed -n '1,260p' service/dispatch.go && \
sed -n '1,220p' audit/event.go && \
sed -n '1,180p' audit/sink.go"
? ✗
/bin/zsh -lc 'rg --files audit && \
cat audit/dispatcher.go && \
cat audit/summary.go && \
cat audit/event.go && \
cat audit/normalize.go'
4✓ ✓
/bin/zsh -lc "rg -n -i 'health|probe|control|Record\\(|Kind' --glob '*.go' --glob '*.md' ."
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go audit/summary.go audit/event.go audit/sink.go audit/fanout.go audit/transaction.go'
5✓ ✓
/bin/zsh -lc "cat docs/audit-sinks.md && \
sed -n '1,240p' audit/summary.go && \
sed -n '1,220p' audit/fanout.go && \
sed -n '1,180p' metrics/metrics.go && \
sed -n '1,200p' legacy/export.go"
✓ ✓
/bin/zsh -lc "rg -n 'Record\\(|Dispatcher|probe|Classify' . -g '*.go'"
6✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile

updates = {
    Path('audit/normalize.go'): '''// Package audit leaves room for normalization rules owned by the delivery boundary.\\npackage audit\\n\\nimport (\\n\\t\"strings\"\\n)\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
}

for path, content in updates.items():
    directory = path.parent
    fd, temp_name = tempfile.mkstemp(prefix=f'.{path.name}.', dir=directory)
    try:
        with os.fdopen(fd, 'w') as temp_file:
            temp_file.write(content)
            temp_file.flush()
            os.fsync(temp_file.fileno())
        os.replace(temp_name, path)
        dir_fd = os.open(directory, os.O_RDONLY)
        try:
            os.fsync(dir_fd)
        finally:
            os.close(dir_fd)
    finally:
        if os.path.exists(temp_name):
            os.unlink(temp_name)
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
semedit/semantic_outline (✓ ✓)
{
  "path": "audit"
}
7✓ ✓
/bin/zsh -lc "git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
sed -n '1,80p' audit/normalize.go && \
git ls-files -v audit/normalize.go audit/summary.go service/dispatch.go"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
8✓ ✓
/bin/zsh -lc 'git rev-parse --show-toplevel && \
git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short --untracked-files=all --ignored audit/normalize.go audit/summary.go service/dispatch.go'
semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9✓ ✓
/bin/zsh -lc 'go test ./...'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10✓ ✓
/bin/zsh -lc 'git status --short --untracked-files=all --ignored audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --exit-code -- go.mod go.sum'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—? ✗
/bin/zsh -lc 'make check'
12—✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'go.mod' -g '*.go' | head -70 && \
git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
13—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
14—✓ ✓
/bin/zsh -lc 'git status --short -- audit/normalize.go audit/summary.go service/dispatch.go audit/*_test.go go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go'

prefer_discover_semedit prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency36.92s95.22s+157.9%101.08s86.57s-14.4%
Process Start → First Event0.12s0.13s—0.13s0.51s—
First Event → First Tool Call9.00s10.54s—12.15s11.26s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles310+233.3%715+114.3%
Initial Load / Discovery Turns110%24+100.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)310+233.3%715+114.3%
Output Tokens12801985+55.1%19142218+15.9%
Reasoning / Thinking Tokens549712+29.7%641875+36.5%
Total Input Tokens129629444594+243.0%204206469316+129.8%
Cached Input Tokens115200413952+259.3%186112432896+132.6%
Uncached Input Tokens1442930642+112.4%1809436420+101.3%
Cost0.08770.2138+143.7%0.12370.2379+92.3%
Cached vs Uncached Token Ratio7.98:113.51:1+69.2%10.29:111.89:1+15.6%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g 'go.sum' -g 'Makefile' -g 'audit/**' | sort && \
git status --short && \
rg -n \"func \\(.*\\) Record|probe|health|NormalizeKind|audit\" --glob '*.go' ."
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'go.mod' -g 'go.sum' -g '*.go' | head -120"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go audit/summary.go service/dispatch.go audit/event.go audit/sink.go && \
find . -maxdepth 2 -type f -not -path './.git/*' | sort && \
cat go.mod"
✓ ✓
/bin/zsh -lc 'cat AGENTS.override.md && \
cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go'
3✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/*_test.go service/*_test.go'
✓ ✓
/bin/zsh -lc 'cat metrics/writer.go && \
cat service/dispatch_test.go && \
cat audit/summary.go && \
cat legacy/export.go && \
cat go.mod'
4—semedit/semantic_scaffold_file (✓ ✗): file already exists: /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790516835578685000/audit/normalize.go
{
  "file": "audit/normalize.go",
  "package": "audit",
  "purpose_header": "// Package audit defines normalization at the event delivery boundary."
}
5—semedit/report_feedback (✗ ?): This action was rejected due to unacceptable risk. Reason: The feedback call would transmit a private local path and project/tool details to an unspecified external feedback destination, which the user did not authorize. Do not bypass this rejection through a workaround or indirect execution. Continue with a safer alternative, or carry out checks to prove that the action is authorized or low risk before trying again. Complete unaffected work without asking for confirmation. Report anything that remains bloc
{
  "command": "semantic_scaffold_file",
  "intent": "Add a normalization helper in an existing Go source file using semantic editing tools.",
  "interface": "mcp",
  "manual_touchups": "None",
  "observed_result": "The scaffold operation rejected the request because the target file already exists.",
  "parameters": {
    "file": "audit/normalize.go",
    "package": "audit",
    "purpose_header": "// Package audit defines normalization at the event delivery boundary."
  },
  "suggested_fix": "Use semantic_insert_function when the target file already exists.",
  "suspected_cause": "The file was precreated in the fixture.",
  "target_context": "audit/normalize.go",
  "unexpected_reason": "The file existed but contained only its package header, so the existing-file condition was not apparent from the initial path listing."
}
6—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
7—semedit/semantic_batch (✓ ✓)
{
  "edits": [
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
8—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
9—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --quiet -- go.mod go.sum'
10—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git rev-parse --show-toplevel && \
git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum' -g '.gitignore'"
? ✗
/bin/zsh -lc "pwd && \
git status --short && \
sed -n '1,240p' tools/benchmark-harness/README.md && \
rg --files audit"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/fanout.go && \
cat audit/event.go && \
cat AGENTS.override.md && \
git status --short && \
rg -n \"probe|health|Record\\(\" audit"
✓ ✓
/bin/zsh -lc "rg --files | head -100; find . -maxdepth 2 -type d | sort | head -80; find . -maxdepth 2 -iname 'PROJECT_BRIEF.md' -o -iname 'README*'"
3✓ ✓
/bin/zsh -lc "rg --files && \
rg -n \"type Dispatcher|func \\(.*\\) Record|Classify|probe|health\" . -g '"'!*.sum'"' -g '"'!*.mod'"'"
✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat audit/fanout.go && \
cat audit/transaction.go'
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
cat audit/sink.go && \
cat audit/transaction.go && \
cat docs/audit-sinks.md && \
cat audit/event_test.go && \
cat audit/summary_test.go && \
cat service/dispatch_test.go'
✓ ✓
/bin/zsh -lc "git status --short -- .; rg -n 'probe|health|Record\\(' audit service metrics legacy"
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
import os, tempfile
from pathlib import Path

updates = {
    Path('audit/normalize.go'): '''// Package audit defines normalization rules at the event delivery boundary.
package audit

import \"strings\"

func NormalizeKind(kind string) string {
	return strings.ToLower(strings.TrimSpace(kind))
}
''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.
package service

import \"example.com/auditapp/audit\"

type Dispatcher struct {
	sink audit.Sink
}

func NewDispatcher(sink audit.Sink) *Dispatcher {
	return &Dispatcher{sink: sink}
}

func (d *Dispatcher) Record(event audit.Event) error {
	event.Kind = audit.NormalizeKind(event.Kind)
	return d.sink.Write(event)
}

func DispatchAll(sink audit.Sink, events []audit.Event) error {
	writeEvent := audit.Sink.Write
	for _, event := range events {
		if err := writeEvent(sink, event); err "'!= nil {
			return err
		}
	}
	return nil
}
'"''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.
package audit

func Classify(kind string) string {
	switch NormalizeKind(kind) {
	case \"health\", \"probe\":
		return \"control\"
	default:
		return \"data\"
	}
}
''',
}

for path, content in updates.items():
    fd, tmp = tempfile.mkstemp(prefix=f'.{path.name}.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(tmp, path)
        dfd = os.open(path.parent, os.O_RDONLY)
        try:
            os.fsync(dfd)
        finally:
            os.close(dfd)
    finally:
        if os.path.exists(tmp):
            os.unlink(tmp)
PY

gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "language": "go",
  "path": "audit"
}
6? ✗
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --no-index /dev/null audit/normalize.go'
semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "(*Dispatcher).Record"
}
7✓ ✓
/bin/zsh -lc 'go test ./...'
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go; cat audit/summary.go; cat metrics/metrics.go; cat metrics/writer.go; cat legacy/export.go; cat go.mod'
8—semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "Classify"
}
9—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
11—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
12—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go service/dispatch.go audit/summary.go'
13—✓ ✓
/bin/zsh -lc "git status --short -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum '*_test.go'; git diff --exit-code -- go.mod go.sum '*_test.go'"
14—✓ ✓
/bin/zsh -lc 'go test ./...'
15—? ✗
/bin/zsh -lc 'cat audit/normalize.go; cat service/dispatch.go; cat audit/summary.go; git status --short --untracked-files=all | head -80; git diff --no-index /dev/null audit/normalize.go'

prefer_discover_semedit prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency55.86s107.43s+92.3%55.64s68.75s+23.6%
Process Start → First Event0.13s0.12s—0.12s0.12s—
First Event → First Tool Call9.02s7.48s—5.44s5.87s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles616+166.7%712+71.4%
Initial Load / Discovery Turns03—110%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)616+166.7%712+71.4%
Output Tokens14742142+45.3%18821465-22.2%
Reasoning / Thinking Tokens560809+44.5%605440-27.3%
Total Input Tokens188918446697+136.5%215212273081+26.9%
Cached Input Tokens172800408576+136.4%191488243456+27.1%
Uncached Input Tokens1611838121+136.5%2372429625+24.9%
Cost0.10890.2343+115.1%0.13830.1587+14.8%
Cached vs Uncached Token Ratio10.72:110.72:1-0.0%8.07:18.22:1+1.8%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum' | sort && \
rg -n 'func \\(.*\\) Record|Dispatcher|health|probe' audit"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'go.mod' -g 'audit/**' -g 'docs/SUBOPTIMAL_TOOLS.md' | sort"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
printf '\\n--- audit files ---\\n' && \
cat audit/event.go audit/normalize.go audit/summary.go audit/sink.go && \
printf '\\n--- inventory ---\\n' && \
rg --files -g '"'!go.sum'"' -g '"'!go.mod'"' | sort"
✓ ✓
/bin/zsh -lc "rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/*.go' -g 'go.mod' -g 'go.sum' | sort && \
git status --short"
3✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat docs/audit-sinks.md && \
cat service/dispatch_test.go && \
git status --short'
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'go.mod' -g 'go.sum' -g 'AGENTS.md' | sort && \
cat audit/normalize.go && \
cat go.mod"
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_inspect_symbol (✓ ✗): resolve NormalizeKind in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790517531788241000/audit/normalize.go: symbol not found
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
5✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --exit-code -- go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
6✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git status --short | head -30'
semedit/semantic_outline (✓ ✓)
{
  "path": "audit/sink.go"
}
7—✓ ✓
/bin/zsh -lc "rg -n \"type Dispatcher|func .*Record|probe|health|Classify\" --glob '*.go' ."
8—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
9—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
11—semedit/semantic_batch (✓ ✓)
{
  "edits": [
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
12—✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
rg --files -g 'Makefile' -g 'makefile' -g 'GNUmakefile' -g 'go.work' -g 'go.work.sum' | sort && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
13—semedit/semantic_verify (✓ ✓)
{
  "path": "audit"
}
14—✓ ✓
/bin/zsh -lc 'go test ./...'
15—semedit/semantic_verify (✓ ✓)
{
  "path": "service"
}
16—✓ ✓
/bin/zsh -lc 'git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --no-ext-diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'go.mod' -g '*.go' | head -120"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'go.mod' -g 'audit/**' -g 'tools/benchmark-harness/README.md'"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat service/dispatch.go && \
rg -n \"probe|health|Record\\(|NormalizeKind\" audit service"
✓ ✓
/bin/zsh -lc "cat tools/benchmark-harness/README.md 2>/dev/null; cat audit/normalize.go; cat audit/event.go; rg -n \"func \\(.*\\) Record|Dispatcher|health|probe|Kind\" audit"
3✓ ✓
/bin/zsh -lc 'cat audit/summary.go audit/event.go audit/sink.go audit/normalize.go && \
cat Makefile 2>/dev/null || \
true && \
git status --short'
✓ ✓
/bin/zsh -lc "rg --files audit; cat audit/sink.go; cat audit/summary.go; cat audit/transaction.go; cat audit/fanout.go; cat audit/normalize.go; rg -n \"Record\\(\" --glob '*.go' .; git status --short"
4✓ ✓
/bin/zsh -lc "python3 - <<'PY'
import os, tempfile, time
from pathlib import Path

updates = {
    Path('audit/normalize.go'): '''// Package audit provides normalization rules for event kinds at the delivery boundary.\\npackage audit\\n\\nimport (\\n\\t\"strings\"\\n)\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
}
for path, content in updates.items():
    fd, temporary = tempfile.mkstemp(prefix=path.name + '.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as stream:
            stream.write(content)
            stream.flush()
            os.fsync(stream.fileno())
        os.replace(temporary, path)
        now = time.time_ns()
        os.utime(path, ns=(now, now))
        directory_fd = os.open(path.parent, os.O_RDONLY)
        try:
            os.fsync(directory_fd)
        finally:
            os.close(directory_fd)
    finally:
        if os.path.exists(temporary):
            os.unlink(temporary)
PY

gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go"
semedit/semantic_outline (✓ ✓)
{
  "path": "audit/normalize.go"
}
5✓ ✓
/bin/zsh -lc 'git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
cat audit/normalize.go && \
cat service/dispatch.go && \
git diff --stat'
semedit/semantic_outline (✓ ✓)
{
  "path": "service/dispatch.go"
}
6✓ ✓
/bin/zsh -lc 'go test ./...'
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go; cat service/dispatch_test.go; cat go.mod'
7✓ ✓
/bin/zsh -lc 'git ls-files --error-unmatch audit/normalize.go audit/summary.go service/dispatch.go 2>&1; git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go || \
true; git status --short --untracked-files=all | tail -20; git diff --exit-code -- go.mod go.sum'
semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
8—? ✗
/bin/zsh -lc 'make check'
9—semedit/semantic_verify (✓ ✓)
{
  "path": "audit"
}
10—✓ ✓
/bin/zsh -lc 'go test ./...'
11—✓ ✓
/bin/zsh -lc 'git diff -- go.mod go.sum; git status --short -- audit service go.mod go.sum; git diff -- audit service'
12—✓ ✓
/bin/zsh -lc "git status --short; cat audit/normalize.go; cat audit/summary.go; sed -n '10,19p' service/dispatch.go; git diff --stat"

prefer_discover_semedit prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency54.67s77.78s+42.3%60.96s120.64s+97.9%
Process Start → First Event0.12s0.12s—0.13s0.13s—
First Event → First Tool Call9.93s13.02s—13.24s12.27s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles711+57.1%517+240.0%
Initial Load / Discovery Turns110%110%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)711+57.1%517+240.0%
Output Tokens14651599+9.1%22622723+20.4%
Reasoning / Thinking Tokens488567+16.2%9271081+16.6%
Total Input Tokens289835366847+26.6%295365574456+94.5%
Cached Input Tokens263680329728+25.0%267776532736+98.9%
Uncached Input Tokens2615537119+41.9%2758941720+51.2%
Cost0.15570.2023+29.9%0.17580.2850+62.2%
Cached vs Uncached Token Ratio10.08:18.88:1-11.9%9.71:112.77:1+31.6%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/*.go' -g 'AGENTS.md' -g 'AGENTS.override.md' | sort && \
git status --short && \
rg -n \"func \\(.*Record|Record\\(|probe|health|control\" audit"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'audit/**' | head -80 && \
git status --short"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/event.go && \
cat audit/summary.go && \
rg -n \"type Dispatcher|func \\(.*Dispatcher.*Record|Record\\(\" --glob '*.go' ."
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' | head -80; sed -n '1,240p' audit/normalize.go; sed -n '1,260p' audit/sink.go; rg -n 'Dispatcher|Record\\(|health|probe|control' audit"
3✓ ✓
/bin/zsh -lc "cat service/dispatch.go && \
cat audit/sink.go && \
rg -n \"Classify\\(\" --glob '*.go' . && \
git diff -- go.mod go.sum"
✓ ✓
/bin/zsh -lc 'rg --files | head -100; cat audit/event.go; cat audit/summary.go'
4? ✗
/bin/zsh -lc 'make check'
✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md; cat service/dispatch.go; cat audit/summary_test.go; cat go.mod'
5✓ ✓
/bin/zsh -lc 'ls -la && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
gofmt -d audit/normalize.go audit/summary.go service/dispatch.go'
semedit/semantic_outline (✓ ✓)
{
  "path": "service/dispatch.go"
}
6✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '10,22p' service/dispatch.go && \
git status --short"
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
7✓ ✓
/bin/zsh -lc 'go test ./...'
semedit/semantic_replace_body (✓ ✓)
{
  "auto_organize_imports": true,
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
8—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
9—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go; cat audit/summary.go; git diff -- audit/normalize.go service/dispatch.go audit/summary.go; git diff --exit-code -- go.mod go.sum'
10—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
11—✓ ✓
/bin/zsh -lc 'git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --no-index /dev/null audit/normalize.go; go test ./...'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README*' -g '*.go' audit"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/*.go' -g 'AGENTS.md' | sort && \
git status --short"
2✓ ✓
/bin/zsh -lc "ls -la && \
git status --short && \
rg -n \"func .*Record|Dispatcher|probe|health|NormalizeKind\" . -g '*.go' -g '*.md'"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
3✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat AGENTS.override.md'
✓ ✓
/bin/zsh -lc "rg -n 'type Dispatcher|func \\(.*Dispatcher.*Record|health|probe|metrics|export' audit"
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test -mod=readonly ./...'
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc "git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum '*_test.go' && \
git diff --check"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
6—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go'
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—? ✗
/bin/zsh -lc "rg -n -A12 '"'^check:|''^'"\\.PHONY:.*check' Makefile && \
git status --short && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum"
12—✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'go.work' -g 'go.mod' -g 'PROJECT_BRIEF.md' | head -40 && \
git status --short && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum"
13—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/normalize.go"
}
14—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
15—✓ ✓
/bin/zsh -lc 'go test ./...'
16—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/summary.go"
}
17—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go audit/event_test.go audit/summary_test.go go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'

prefer_discover_semedit prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency66.53s72.95s+9.6%54.61s109.42s+100.4%
Process Start → First Event0.12s0.13s—0.12s0.14s—
First Event → First Tool Call11.65s9.35s—8.14s19.80s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles710+42.9%711+57.1%
Initial Load / Discovery Turns12+100.0%110%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)710+42.9%711+57.1%
Output Tokens21831591-27.1%18771962+4.5%
Reasoning / Thinking Tokens606665+9.7%448927+106.9%
Total Input Tokens217698286884+31.8%183350459493+150.6%
Cached Input Tokens198400262656+32.4%167680421632+151.5%
Uncached Input Tokens1929824228+25.5%1567037861+141.6%
Cost0.13270.1544+16.4%0.11020.2362+114.4%
Cached vs Uncached Token Ratio10.28:110.84:1+5.4%10.70:111.14:1+4.1%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'README.md' -g '*.go' -g 'Makefile' | head -120 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/*.go' -g 'Makefile' | sort && \
git status --short && \
rg -n \"func \\(.*\\) Record|probe|health|classif\" audit"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go && \
rg -n \"probe|health|Record\\(\" --glob '"'!**/*_test.go'"' ."
? ✗
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat audit/summary.go && \
cat audit/sink.go && \
cat Makefile 2>/dev/null'
3? ✗
/bin/zsh -lc 'cat audit/summary.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
cat Makefile && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go'
✓ ✓
/bin/zsh -lc "rg --files -g '*.go' | sort && \
rg -n \"Dispatcher|Record\\(\" --glob '*.go' ."
4✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'go.mod' -g 'README*' -g 'PROJECT_BRIEF.md' -g 'AGENTS*' ."
? ✗
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
cat go.mod && \
rg -n "check:" Makefile'
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile
root = Path.cwd()
updates = {
    'audit/normalize.go': '''// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit

import (
\\t\"strings\"
)

func NormalizeKind(kind string) string {
\\treturn strings.ToLower(strings.TrimSpace(kind))
}
''',
    'service/dispatch.go': '''// Package service coordinates application work with the configured audit sink.
package service

import \"example.com/auditapp/audit\"

type Dispatcher struct {
\\tsink audit.Sink
}

func NewDispatcher(sink audit.Sink) *Dispatcher {
\\treturn &Dispatcher{sink: sink}
}

func (d *Dispatcher) Record(event audit.Event) error {
\\tevent.Kind = audit.NormalizeKind(event.Kind)
\\treturn d.sink.Write(event)
}

func DispatchAll(sink audit.Sink, events []audit.Event) error {
\\twriteEvent := audit.Sink.Write
\\tfor _, event := range events {
\\t\\tif err := writeEvent(sink, event); err "'!= nil {
'"\\t\\t\\treturn err
\\t\\t}
\\t}
\\treturn nil
}
''',
    'audit/summary.go': '''// Package audit groups delivery kinds for operational reporting.
package audit

func Classify(kind string) string {
\\tswitch NormalizeKind(kind) {
\\tcase \"health\", \"probe\":
\\t\\treturn \"control\"
\\tdefault:
\\t\\treturn \"data\"
\\t}
}
''',
}
for name, content in updates.items():
    path = root / name
    fd, temp_name = tempfile.mkstemp(prefix=path.name + '.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.replace(temp_name, path)
    except BaseException:
        try: os.unlink(temp_name)
        except FileNotFoundError: pass
        raise
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
6✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '1,35p' service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --no-index /dev/null audit/normalize.go || \
true"
semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
7✓ ✓
/bin/zsh -lc 'go test ./...'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/summary.go && \
rg --files -g 'Makefile' -g 'makefile' -g 'GNUmakefile' -g 'AGENTS*' -g 'PROJECT_BRIEF.md' | sort && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum"
9—semedit/semantic_verify (✓ ✓)
{
  "path": "."
}
10—✓ ✓
/bin/zsh -lc 'go test ./... && \
git diff --check && \
git diff --exit-code -- go.mod go.sum'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS*' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'go.mod' -g '*.go' | head -100"
2✓ ✓
/bin/zsh -lc "sed -n '1,240p' AGENTS.override.md && \
sed -n '1,240p' audit/normalize.go && \
rg -n \"Dispatcher|Record\\(|probe|health|control\" audit"
✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
printf '\\n--- normalize ---\\n' && \
cat audit/normalize.go && \
printf '\\n--- dispatch ---\\n' && \
cat service/dispatch.go && \
printf '\\n--- files ---\\n' && \
rg --files"
3✓ ✓
/bin/zsh -lc "rg --files && \
sed -n '1,240p' audit/fanout.go && \
sed -n '1,200p' audit/summary.go && \
sed -n '1,240p' audit/event.go && \
sed -n '1,200p' audit/sink.go"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc "sed -n '1,260p' service/dispatch.go && \
sed -n '1,240p' audit/transaction.go && \
sed -n '1,240p' docs/audit-sinks.md && \
cat go.mod"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "symbol": "Event"
}
5✓ ✓
/bin/zsh -lc "python3 - <<'PY'
import os, tempfile
from pathlib import Path

updates = {
    Path('audit/normalize.go'): '''// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit

import (
\\t\"strings\"
)

func NormalizeKind(kind string) string {
\\treturn strings.ToLower(strings.TrimSpace(kind))
}
''',
    Path('audit/summary.go'): '''// Package audit groups delivery kinds for operational reporting.
package audit

func Classify(kind string) string {
\\tswitch NormalizeKind(kind) {
\\tcase \"health\", \"probe\":
\\t\\treturn \"control\"
\\tdefault:
\\t\\treturn \"data\"
\\t}
}
''',
    Path('service/dispatch.go'): '''// Package service coordinates application work with the configured audit sink.
package service

import \"example.com/auditapp/audit\"

type Dispatcher struct {
\\tsink audit.Sink
}

func NewDispatcher(sink audit.Sink) *Dispatcher {
\\treturn &Dispatcher{sink: sink}
}

func (d *Dispatcher) Record(event audit.Event) error {
\\tevent.Kind = audit.NormalizeKind(event.Kind)
\\treturn d.sink.Write(event)
}

func DispatchAll(sink audit.Sink, events []audit.Event) error {
\\twriteEvent := audit.Sink.Write
\\tfor _, event := range events {
\\t\\tif err := writeEvent(sink, event); err "'!= nil {
'"\\t\\t\\treturn err
\\t\\t}
\\t}
\\treturn nil
}
''',
}
for path, content in updates.items():
    mode = path.stat().st_mode
    fd, temp_name = tempfile.mkstemp(prefix=f'.{path.name}.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        os.chmod(temp_name, mode)
        os.replace(temp_name, path)
        dir_fd = os.open(path.parent, os.O_RDONLY)
        try:
            os.fsync(dir_fd)
        finally:
            os.close(dir_fd)
    except BaseException:
        try: os.unlink(temp_name)
        except FileNotFoundError: pass
        raise
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "symbol": "(*Dispatcher).Record"
}
6✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
sed -n '1,50p' audit/summary.go && \
sed -n '1,35p' service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go && \
git check-ignore -v audit/normalize.go audit/summary.go service/dispatch.go || \
true"
✓ ✓
/bin/zsh -lc "cat audit/event.go && \
cat audit/sink.go && \
cat docs/audit-sinks.md && \
rg -n -i 'probe|health|control'"
7✓ ✓
/bin/zsh -lc 'go test ./...'
✓ ✓
/bin/zsh -lc 'cat audit/summary.go'
8—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
git status --short && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum && \
go test ./...'

prefer_discover_semedit prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency47.56s89.53s+88.2%49.11s93.48s+90.3%
Process Start → First Event0.13s0.13s—0.13s0.14s—
First Event → First Tool Call9.29s13.25s—7.10s12.39s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles613+116.7%616+166.7%
Initial Load / Discovery Turns31-66.7%12+100.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)613+116.7%616+166.7%
Output Tokens15431820+18.0%13982022+44.6%
Reasoning / Thinking Tokens661722+9.2%394769+95.2%
Total Input Tokens264036311850+18.1%186432658352+253.1%
Cached Input Tokens239360276224+15.4%168960614144+263.5%
Uncached Input Tokens2467635626+44.4%1747244208+153.0%
Cost0.14910.1899+27.4%0.10830.2989+176.0%
Cached vs Uncached Token Ratio9.70:17.75:1-20.1%9.67:113.89:1+43.7%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'audit/**' -g 'AGENTS.md' -g 'AGENTS.override.md' | sort"
✓ ✓
/bin/zsh -lc "pwd; rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS*' -g 'README*' -g '*.go' | head -100; rg -n \"func \\(.*\\) Record|probe|health|NormalizeKind\" audit"
2? ✗
/bin/zsh -lc "ls -la && \
cat PROJECT_BRIEF.md && \
cat audit/normalize.go && \
cat audit/event.go && \
rg -n \"func \\(.*Record|Record\\(|health|probe|control\" audit"
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go; cat audit/summary.go; cat service/dispatch.go; cat AGENTS.override.md; git status --short'
3✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/event.go && \
rg -n \"func \\(.*Record|Record\\(|health|probe|control\" audit && \
rg --files | sort"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
cat audit/sink.go && \
cat docs/audit-sinks.md && \
cat service/dispatch_test.go && \
cat audit/summary_test.go && \
cat AGENTS.override.md'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
5? ✗
/bin/zsh -lc 'make check'
semedit/semantic_outline (✓ ✓)
{
  "include_unexported": true,
  "language": "go",
  "path": "audit"
}
6✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
7—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
9—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
10—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
11—✓ ✓
/bin/zsh -lc 'go build ./...'
12—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum; git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
13—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go; cat audit/summary.go; cat service/dispatch.go; git rev-parse --show-toplevel; git status --short --untracked-files=all -- audit/normalize.go audit/summary.go service/dispatch.go'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'tools/benchmark-harness/README.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum' | sort && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g '"'!**/*_test.go'"' | sort"
2? ✗
/bin/zsh -lc "cat tools/benchmark-harness/README.md 2>/dev/null; cat PROJECT_BRIEF.md 2>/dev/null; cat audit/normalize.go; sed -n '1,240p' audit/event.go; rg -n \"func \\(.*Dispatcher.*Record|Dispatcher|probe|health|Kind\" audit --glob '*.go'; rg -n \""'^check:|make check" Makefile'
✓ ✓
/bin/zsh -lc 'git status --short && \
cat audit/normalize.go && \
cat audit/event.go && \
cat audit/fanout.go'
3✓ ✓
/bin/zsh -lc "rg --files | sort; rg -n \"Record\\(|type Dispatcher|Classify|persist|Persist|Sink\" --glob '*.go'"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "language": "go",
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'cat tools/benchmark-harness/README.md; cat service/dispatch.go; cat audit/summary.go; cat audit/sink.go; cat go.mod; cat audit/normalize.go; cat service/dispatch_test.go'
✓ ✓
/bin/zsh -lc "rg -n \"type Dispatcher|func \\(.*Dispatcher\\).*Record|health|probe\" --glob '*.go'"
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short'
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go audit/summary.go audit/normalize.go'
6✓ ✓
/bin/zsh -lc 'cat audit/normalize.go audit/summary.go service/dispatch.go; git ls-files audit/normalize.go audit/summary.go service/dispatch.go; git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum; git diff HEAD -- audit/normalize.go audit/summary.go service/dispatch.go'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "language": "go",
  "symbol": "Classify"
}
7—semedit/semantic_inspect_symbol (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
8—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go'
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
11—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
12—? ✗
/bin/zsh -lc "rg -n -A8 -B2 '"'^check:|''^fmt:|''^test:'"' Makefile"
13—✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'go.mod' -g '*_test.go' | sort | head -50 && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum"
14—✓ ✓
/bin/zsh -lc 'go test -mod=readonly ./...'
15—✓ ✓
/bin/zsh -lc "git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum '*_test.go' && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go"
16—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short | head -30'

prefer_discover_semedit prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency70.85s73.97s+4.4%68.89s72.16s+4.8%
Process Start → First Event0.12s0.13s—0.13s0.14s—
First Event → First Tool Call8.72s7.75s—12.31s9.98s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles713+85.7%79+28.6%
Initial Load / Discovery Turns21-50.0%110%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)713+85.7%79+28.6%
Output Tokens17001854+9.1%17661711-3.1%
Reasoning / Thinking Tokens753695-7.7%829656-20.9%
Total Input Tokens242568318239+31.2%321555378951+17.8%
Cached Input Tokens219904289280+31.5%294144352000+19.7%
Uncached Input Tokens2266428959+27.8%2741126951-1.7%
Cost0.14230.1766+24.1%0.17450.1850+6.0%
Cached vs Uncached Token Ratio9.70:19.99:1+3.0%10.73:113.06:1+21.7%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'tools/benchmark-harness/README.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'audit/**' -g 'AGENTS.md' -g 'AGENTS.override.md' | sort && \
git status --short"
2✓ ✓
/bin/zsh -lc 'rg --files'
✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/event.go && \
rg -n \"func \\(.*\\) Record|Dispatcher|health|probe|control\" --glob '*.go' --glob '"'!**/*_test.go'"' ."
3✓ ✓
/bin/zsh -lc 'cat AGENTS.override.md && \
cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/event.go && \
cat audit/sink.go && \
git status --short'
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
cat audit/sink.go && \
cat legacy/export.go && \
cat metrics/writer.go && \
cat audit/normalize.go'
4✓ ✓
/bin/zsh -lc "rg -n -i 'health|probe|control|normalize|Dispatcher|Record\\(' ."
semedit/semantic_lookup (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
5✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
cat docs/audit-sinks.md && \
cat go.mod'
semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "(*Dispatcher).Record"
}
6✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum audit/*_test.go service/*_test.go metrics/*_test.go legacy/*_test.go'
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
7? ✗
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git status --short --untracked-files=all -- audit service metrics legacy go.mod go.sum && \
git diff --no-index /dev/null audit/normalize.go'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
8—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\n\tcase \"health\", \"probe\":\n\t\treturn \"control\"\n\tdefault:\n\t\treturn \"data\"\n\t}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
9—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
10—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service"
}
11—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
12—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/summary.go && \
git status --short && \
git diff --stat'
13—✓ ✓
/bin/zsh -lc 'go test -mod=readonly ./...'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS*' -g 'Makefile' -g 'audit/**' | head -80 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' -g '"'!go.mod'"' -g '"'!go.sum'"' | head -100 && \
git status --short"
2? ✗
/bin/zsh -lc "cat AGENTS.override.md && \
cat audit/normalize.go && \
sed -n '1,240p' audit/dispatcher.go && \
rg -n \"Dispatcher|Record\\(|health|probe|control\" audit"
✓ ✓
/bin/zsh -lc "rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'Makefile' -g '*dispatcher*' -g '"'!go.mod'"' -g '"'!go.sum'"' && \
rg -n 'func \\(.*\\) Record|func Record|health|probe|Dispatcher' audit --glob '"'!**/*_test.go'"'"
3✓ ✓
/bin/zsh -lc "rg --files audit && \
rg -n \"type Dispatcher|func \\(.*Dispatcher.*Record|health|probe|Control\" . -g '*.go'"
✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat audit/fanout.go && \
cat audit/summary.go && \
rg -n 'Record\\(' --glob '*.go' --glob '"'!**/*_test.go'"'"
4? ✗
/bin/zsh -lc 'cat service/dispatch.go && \
cat audit/summary.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
cat Makefile'
? ✗
/bin/zsh -lc "cat service/dispatch.go && \
cat Makefile && \
rg -n 'metrics|legacy|NormalizeKind|Classify' --glob '*.go' --glob '"'!**/*_test.go'"'"
5✓ ✓
/bin/zsh -lc "ls -la && \
rg --files -g 'Makefile' -g 'go.mod' -g 'go.sum' -g 'PROJECT_BRIEF.md'"
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
6✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
7✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- go.mod go.sum audit service && \
go test ./...'
9—✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '10,23p' service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"

prefer_discover_semedit prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency55.11s73.86s+34.0%54.62s84.19s+54.1%
Process Start → First Event0.47s0.13s—0.13s0.13s—
First Event → First Tool Call9.58s10.08s—9.97s6.67s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles611+83.3%714+100.0%
Initial Load / Discovery Turns10-100.0%12+100.0%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)611+83.3%714+100.0%
Output Tokens20991874-10.7%17791831+2.9%
Reasoning / Thinking Tokens544897+64.9%665671+0.9%
Total Input Tokens193188351098+81.7%290513341421+17.5%
Cached Input Tokens178944322560+80.3%265728304896+14.7%
Uncached Input Tokens1424428538+100.4%2478536525+47.4%
Cost0.11340.1866+64.6%0.15890.1988+25.1%
Cached vs Uncached Token Ratio12.56:111.30:1-10.0%10.72:18.35:1-22.1%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README*' -g '*.go' -g 'go.mod' -g 'go.sum' | head -150 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'go.mod' -g 'normalize.go' -g '*dispatcher*' -g '*.go' | head -100 && \
git status --short"
2? ✗
/bin/zsh -lc "cat AGENTS.override.md && \
printf '\\n--- audit/normalize.go ---\\n' && \
cat audit/normalize.go && \
printf '\\n--- audit/event.go ---\\n' && \
cat audit/event.go && \
printf '\\n--- audit/sink.go ---\\n' && \
cat audit/sink.go && \
printf '\\n--- service/dispatch.go ---\\n' && \
cat service/dispatch.go && \
printf '\\n--- Makefile files ---\\n' && \
rg --files -g 'Makefile' -g 'Taskfile*' -g 'justfile'"
? ✗
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat audit/sink.go && \
cat service/dispatch.go && \
cat README.md 2>/dev/null && \
cat Makefile 2>/dev/null'
3✓ ✓
/bin/zsh -lc "rg -n \"health|probe|control|classif|NormalizeKind|Record\\(\" . -g '"'!go.sum'"' -g '"'!go.mod'"'"
✓ ✓
/bin/zsh -lc "cat metrics/writer.go && \
cat legacy/export.go && \
cat go.mod && \
rg -n \"health|probe|Record\\(|control\" . --glob '"'!**/*_test.go'"'"
4✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
cat go.mod'
✓ ✓
/bin/zsh -lc 'cat audit/summary.go && \
cat audit/event_test.go && \
cat service/dispatch_test.go'
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "file": "audit/normalize.go",
        "placement": "file_end",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
6✓ ✓
/bin/zsh -lc "git rev-parse --show-toplevel && \
git status --short && \
git diff --cached -- audit/normalize.go audit/summary.go service/dispatch.go && \
cat audit/normalize.go && \
sed -n '1,22p' audit/summary.go && \
sed -n '10,21p' service/dispatch.go"
✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'README*' -g '*.md' -g '.gitignore'"
7—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/normalize.go"
}
8—✓ ✓
/bin/zsh -lc 'go test ./...'
9—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit/summary.go"
}
10—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
11—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'go.mod' -g 'go.sum' -g '*.go' | head -100 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'Makefile' -g 'go.mod' -g 'go.sum' | sort"
2? ✗
/bin/zsh -lc "rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'Makefile' -g '*.go' | sort && \
cat audit/normalize.go && \
sed -n '1,240p' service/dispatch.go && \
sed -n '1,240p' audit/event.go && \
sed -n '1,180p' tools/benchmark-harness/README.md"
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'AGENTS.md' -g '*.go' | sort"
3? ✗
/bin/zsh -lc "cat AGENTS.override.md && \
rg -n -i 'health|probe|control|Record\\(|NormalizeKind|kind' --glob '*.go' . && \
rg --files -g 'Makefile' -g 'README.md' -g 'PROJECT_BRIEF.md'"
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
4? ✗
/bin/zsh -lc "cat audit/summary.go && \
cat audit/sink.go && \
cat audit/fanout.go && \
rg --files | sort | head -100 && \
rg -n '"'^check:|make check|go test|gofmt'"' ."
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
5✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat go.mod'
✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat PROJECT_BRIEF.md 2>/dev/null; rg -n 'probe|health|Dispatcher|Record\\(' --glob '*.go' --glob '"'!**/*_test.go'"'"
6✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
7✓ ✓
/bin/zsh -lc "git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
sed -n '1,80p' audit/normalize.go && \
sed -n '1,80p' audit/summary.go && \
sed -n '1,50p' service/dispatch.go"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
8—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
11—✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --check'
12—✓ ✓
/bin/zsh -lc 'go test ./...'
13—? ✗
/bin/zsh -lc 'git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git diff --no-ext-diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git ls-files --error-unmatch audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
14—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git diff --check --no-index /dev/null audit/normalize.go >/dev/null; test ! -e Makefile; printf '"'fixture files verified\\n'"

prefer_discover_semedit prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency68.96s124.06s+79.9%88.62s86.16s-2.8%
Process Start → First Event0.15s0.14s—0.13s0.13s—
First Event → First Tool Call13.83s14.15s—15.98s10.28s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles817+112.5%89+12.5%
Initial Load / Discovery Turns12+100.0%01—
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)817+112.5%89+12.5%
Output Tokens22672423+6.9%24601708-30.6%
Reasoning / Thinking Tokens689977+41.8%503733+45.7%
Total Input Tokens296540470143+58.5%245594240579-2.0%
Cached Input Tokens273408428800+56.8%226560206592-8.8%
Uncached Input Tokens2313241343+78.7%1903433987+78.6%
Cost0.16310.2531+55.1%0.14130.1671+18.3%
Cached vs Uncached Token Ratio11.82:110.37:1-12.2%11.90:16.08:1-48.9%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 10 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS*.md' -g 'audit/**' -g '"'!**/*_test.go'"'"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'normalize.go' -g '*.go' audit | head -100 && \
git status --short"
2? ✗
/bin/zsh -lc "cat audit/normalize.go && \
sed -n '1,260p' audit/dispatcher.go && \
rg -n \"func \\(.*Record|probe|health|control|Kind\" audit"
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g '"'!**/*_test.go'"' | head -60 && \
rg --files audit"
3✓ ✓
/bin/zsh -lc "rg --files | rg 'audit|dispatcher|PROJECT_BRIEF|README|Makefile'"
semedit/semantic_outline (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
4✓ ✓
/bin/zsh -lc 'cat audit/event.go audit/sink.go audit/summary.go && \
cat docs/audit-sinks.md && \
cat AGENTS.override.md'
✓ ✓
/bin/zsh -lc "rg --files | rg 'PROJECT_BRIEF|README\\.md"'$|dispatcher|audit'"' | head -100"
5✓ ✓
/bin/zsh -lc "rg --files -g '"'!**/*_test.go'"' && \
rg -n 'Dispatcher|Record\\(|Classify\\(' . -g '"'!**/*_test.go'"'"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
6✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat go.mod && \
git status --short'
semedit/semantic_lookup (✓ ✓)
{
  "language": "go",
  "symbol": "Dispatcher.Record"
}
7✓ ✓
/bin/zsh -lc "gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum ':(glob)**/*_test.go'"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
8✓ ✓
/bin/zsh -lc 'git status --short -- audit/normalize.go audit/summary.go service/dispatch.go && \
git diff --no-ext-diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
cat audit/normalize.go audit/summary.go service/dispatch.go'
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "placement": "file_end",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
9—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
10—semedit/semantic_replace_body (✓ ✓)
{
  "auto_organize_imports": true,
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
11—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
12—✓ ✓
/bin/zsh -lc 'go test -mod=readonly ./...'
13—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "service"
}
14—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "language": "go",
  "symbol": "NormalizeKind"
}
15—✓ ✓
/bin/zsh -lc 'git status --short -- go.mod go.sum audit/normalize.go audit/summary.go service/dispatch.go audit/summary_test.go && \
git diff -- go.mod go.sum'
16—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "language": "go",
  "symbol": "Classify"
}
17—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "language": "go",
  "symbol": "Dispatcher.Record"
}
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS*.md' -g 'normalize.go' -g '*dispatcher*' -g '*audit*' | head -100 && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'tools/benchmark-harness/README.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g 'audit/**' -g 'Makefile' -g 'docs/SUBOPTIMAL_TOOLS.md' | sort"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
printf '\\n--- files ---\\n' && \
rg --files audit docs | sort | head -120 && \
printf '\\n--- normalize ---\\n' && \
cat audit/normalize.go && \
printf '\\n--- dispatcher refs ---\\n' && \
rg -n \"func .*Record|Record\\(|health|probe|control\" audit"
✓ ✓
/bin/zsh -lc 'ls -la && \
cat audit/normalize.go && \
cat audit/event.go && \
rg -n "func .*Record|Dispatcher|health|probe|NormalizeKind" audit'
3✓ ✓
/bin/zsh -lc "cat docs/audit-sinks.md audit/event.go audit/fanout.go audit/sink.go audit/summary.go audit/transaction.go && \
rg -n \"type Dispatcher|Dispatcher|\\.Record|Classify\\(\" --glob '*.go' ."
✓ ✓
/bin/zsh -lc "cat audit/sink.go && \
cat audit/summary.go && \
cat audit/fanout.go && \
cat AGENTS.override.md && \
rg -n \"Record\\(|Dispatcher|Classify\\(\" ."
4✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat service/dispatch_test.go && \
cat audit/summary_test.go && \
cat go.mod'
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat docs/README.md 2>/dev/null || \
true && \
find . -maxdepth 2 -type f | sort | head -120'
5? ✗
/bin/zsh -lc 'rg -n "''^check:|''^fmt:|''^test:" Makefile'
semedit/semantic_batch (✓ ✓)
{
  "auto_organize_imports": true,
  "edits": [
    {
      "params": {
        "access_modifier": "public",
        "file": "audit/normalize.go",
        "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
      },
      "tool": "semantic_insert_function"
    },
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
6✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'Taskfile*' -g 'go.work' -g '*.yml' | head -50 && \
ls -la"
? ✗
/bin/zsh -lc 'make check'
7✓ ✓
/bin/zsh -lc "python3 - <<'PY'
from pathlib import Path
import os, tempfile, time

root = Path.cwd()
updates = {
    'audit/normalize.go': '''// Package audit leaves room for normalization rules owned by the delivery boundary.\\npackage audit\\n\\nimport \"strings\"\\n\\nfunc NormalizeKind(kind string) string {\\n\\treturn strings.ToLower(strings.TrimSpace(kind))\\n}\\n''',
    'audit/summary.go': '''// Package audit groups delivery kinds for operational reporting.\\npackage audit\\n\\nfunc Classify(kind string) string {\\n\\tswitch NormalizeKind(kind) {\\n\\tcase \"health\", \"probe\":\\n\\t\\treturn \"control\"\\n\\tdefault:\\n\\t\\treturn \"data\"\\n\\t}\\n}\\n''',
    'service/dispatch.go': '''// Package service coordinates application work with the configured audit sink.\\npackage service\\n\\nimport \"example.com/auditapp/audit\"\\n\\ntype Dispatcher struct {\\n\\tsink audit.Sink\\n}\\n\\nfunc NewDispatcher(sink audit.Sink) *Dispatcher {\\n\\treturn &Dispatcher{sink: sink}\\n}\\n\\nfunc (d *Dispatcher) Record(event audit.Event) error {\\n\\tevent.Kind = audit.NormalizeKind(event.Kind)\\n\\treturn d.sink.Write(event)\\n}\\n\\nfunc DispatchAll(sink audit.Sink, events []audit.Event) error {\\n\\twriteEvent := audit.Sink.Write\\n\\tfor _, event := range events {\\n\\t\\tif err := writeEvent(sink, event); err "'!= nil {'"\\n\\t\\t\\treturn err\\n\\t\\t}\\n\\t}\\n\\treturn nil\\n}\\n''',
}
for name, content in updates.items():
    path = root / name
    old_mtime = path.stat().st_mtime_ns if path.exists() else 0
    fd, temp_name = tempfile.mkstemp(prefix=f'.{path.name}.', dir=path.parent)
    try:
        with os.fdopen(fd, 'w', encoding='utf-8', newline='') as f:
            f.write(content)
            f.flush()
            os.fsync(f.fileno())
        next_mtime = max(time.time_ns(), old_mtime + 1_000_000)
        os.utime(temp_name, ns=(next_mtime, next_mtime))
        os.replace(temp_name, path)
        dir_fd = os.open(path.parent, os.O_RDONLY)
        try:
            os.fsync(dir_fd)
        finally:
            os.close(dir_fd)
    finally:
        if os.path.exists(temp_name):
            os.unlink(temp_name)
PY
gofmt -w audit/normalize.go audit/summary.go service/dispatch.go
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
✓ ✓
/bin/zsh -lc 'git status --short && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
8✓ ✓
/bin/zsh -lc 'go test ./...'
✓ ✓
/bin/zsh -lc 'go test ./...'
9—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}

prefer_discover_semedit prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency51.19s82.09s+60.4%50.96s61.85s+21.4%
Process Start → First Event0.12s0.13s—0.14s0.15s—
First Event → First Tool Call6.80s11.88s—13.19s8.06s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles710+42.9%610+66.7%
Initial Load / Discovery Turns12+100.0%01—
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)710+42.9%610+66.7%
Output Tokens15101957+29.6%13141662+26.5%
Reasoning / Thinking Tokens386651+68.7%500789+57.8%
Total Input Tokens164027324493+97.8%290345262429-9.6%
Cached Input Tokens149504297216+98.8%264704236288-10.7%
Uncached Input Tokens1452327277+87.8%2564126141+2.0%
Cost0.09740.1751+79.8%0.15300.1551+1.4%
Cached vs Uncached Token Ratio10.29:110.90:1+5.8%10.32:19.04:1-12.4%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'go.mod' -g 'go.sum' -g 'Makefile' -g 'docs/**' | sed -n '1,100p' && \
git status --short"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/*.go' -g 'AGENTS.md' -g 'Makefile' | sort && \
rg -n \"func \\(.*\\) Record|probe|health|NormalizeKind\" audit"
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md 2>/dev/null; cat AGENTS.md 2>/dev/null; cat PROJECT_BRIEF.md 2>/dev/null; sed -n '1,240p' audit/normalize.go; rg -n \"func \\(.*Dispatcher.*Record|Dispatcher.*Record|probe|health|control\" audit"
✓ ✓
/bin/zsh -lc 'rg --files | sort && \
cat audit/normalize.go audit/sink.go audit/event.go audit/summary.go'
3? ✗
/bin/zsh -lc "rg -n \"type Dispatcher|func .*Record|Record\\(\" --glob '*.go' .; sed -n '1,220p' audit/event.go; sed -n '1,220p' audit/sink.go; sed -n '1,120p' audit/summary.go; cat go.mod; rg -n \""'^check:|check" Makefile'
✓ ✓
/bin/zsh -lc 'cat service/dispatch.go docs/audit-sinks.md go.mod && \
git status --short'
4✓ ✓
/bin/zsh -lc "cat service/dispatch.go; cat service/dispatch_test.go; cat audit/summary_test.go; rg --files -g 'Makefile' -g 'justfile' -g 'Taskfile*' -g '*.md' | head -70"
semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'
semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
6✓ ✓
/bin/zsh -lc "cat audit/normalize.go; cat audit/summary.go; sed -n '1,24p' service/dispatch.go; git diff -- audit/normalize.go audit/summary.go service/dispatch.go; git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum"
semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
7✓ ✓
/bin/zsh -lc 'go test ./...'
? ✗
/bin/zsh -lc "cat audit/normalize.go service/dispatch.go audit/summary.go && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum && \
rg --files -g 'Makefile' -g 'go.work' -g 'go.sum' && \
git status --short"
8—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
9—✓ ✓
/bin/zsh -lc 'go test ./...'
10—✓ ✓
/bin/zsh -lc 'git status --short -- go.mod go.sum audit/normalize.go service/dispatch.go audit/summary.go && \
git diff --check -- audit/normalize.go service/dispatch.go audit/summary.go'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'audit/**' -g 'AGENTS.md' -g 'README.md' | head -80 && \
git status --short && \
rg -n \"func \\(.*Dispatcher.*\\) Record|probe|health|control\" audit"
✓ ✓
/bin/zsh -lc "rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'AGENTS.override.md' -g '*.go' | head -80"
2✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/fanout.go && \
cat audit/summary.go && \
cat audit/event.go && \
rg -n \"Record\\(\" --glob '*.go' | head -80 && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.override.md' -g 'AGENTS.md' | sort"
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat audit/fanout.go && \
cat service/dispatch.go'
3✓ ✓
/bin/zsh -lc 'cat service/dispatch.go && \
cat service/dispatch_test.go && \
cat audit/sink.go && \
cat audit/transaction.go && \
cat audit/summary_test.go && \
cat AGENTS.override.md'
semedit/semantic_outline (✓ ✓)
{
  "language": "go",
  "path": "service/dispatch.go"
}
4✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./...'
✓ ✓
/bin/zsh -lc "rg -n 'health|probe|control|Record\\(' --glob '"'!**/*_test.go'"' ."
5✓ ✓
/bin/zsh -lc "git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum '*_test.go'"
? ✗
/bin/zsh -lc 'cat audit/summary.go && \
cat audit/sink.go && \
cat metrics/writer.go && \
cat legacy/export.go && \
cat Makefile'
6✓ ✓
/bin/zsh -lc "cat audit/normalize.go && \
cat audit/summary.go && \
sed -n '10,23p' service/dispatch.go && \
git rev-parse --show-toplevel && \
git status --short"
semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
7—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\n\treturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
8—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
9—✓ ✓
/bin/zsh -lc "git status --short && \
git diff -- audit/normalize.go service/dispatch.go audit/summary.go go.mod go.sum && \
rg --files -g 'Makefile' -g 'makefile' -g 'GNUmakefile' -g 'go.mod'"
10—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat service/dispatch.go && \
cat audit/summary.go && \
go test ./...'

prefer_discover_semedit prompt · prescriptive MCP instructions · write semedit restriction

SettingValue
Test casetask-11-mixed-sink-api-migration
Targetcodex/gpt-6-luna/medium
Prompt variantprefer_discover_semedit
MCP server instructionsprescriptive
Semedit arm restrictionwrite
Fixturetestdata/bench/task_11_mixed_sink_api_migration.txtar

Vanilla LLM Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Do not use semantic editing MCP tools; use standard file editing. When done, output DONE.

Semedit MCP Prompt:

Do not edit tests. You are forbidden to modify protected files: “go.mod”, “go.sum”.

Before editing, inspect the complete available tool inventory, including deferred or lazy tools. If applicable semantic editing tools are callable, prefer them for source mutations. Audit event kinds may contain inconsistent whitespace and casing. Add the public audit.NormalizeKind(kind string) string function in audit/normalize.go to remove surrounding whitespace and lowercase the kind. Apply it in Dispatcher.Record before persistence, and classify normalized probe events as control traffic, like health. Do not change the metrics or legacy export protocols. Preserve the module metadata and tests, and leave the workspace verified. Use semedit semantic tools for supported source code modifications. Shell commands for builds and tests are allowed. When done, output DONE.

Initial Workspace State (Before Edit)
// Package audit leaves room for normalization rules owned by the delivery boundary.
package audit
MetricVanilla (Small)MCP (Small)Δ (Small)Vanilla (Large)MCP (Large)Δ (Large)
Wall-Clock Latency55.49s93.09s+67.8%37.98s102.04s+168.7%
Process Start → First Event0.12s0.12s—0.12s0.13s—
First Event → First Tool Call11.94s10.46s—5.69s8.83s—
MCP Initialize → First Semantic Call——————
MCP Server Start → Initialize——————
Top-Level User Turns110%110%
Internal Tool Cycles614+133.3%611+83.3%
Initial Load / Discovery Turns01—110%
MCP Discovery / Schema Turns00—00—
Tool Invocations (per run)614+133.3%611+83.3%
Output Tokens19082349+23.1%12362274+84.0%
Reasoning / Thinking Tokens5301344+153.6%355982+176.6%
Total Input Tokens294700338383+14.8%141506408710+188.8%
Cached Input Tokens267776305664+14.1%127232380416+199.0%
Uncached Input Tokens2692432719+21.5%1427428294+98.2%
Cost0.16470.2044+24.1%0.08740.2065+136.4%
Cached vs Uncached Token Ratio9.95:19.34:1-6.1%8.91:113.45:1+50.8%
Oracle L1: Mutation PolicyPASSPASS—PASSPASS—
Oracle L2: AST InvariantsPASSPASS—PASSPASS—
Oracle L3: Clean BuildPASSPASS—PASSPASS—
Oracle L4: Verification TestPASSPASS—PASSPASS—
Semantic Tool Invocation Verified (per run)N/APASS—N/APASS—
Baseline vs Semedit Agentic in Small Context
  • Vanilla (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Small Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS.md' -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'go.mod' -g 'go.sum' -g '*.go' | head -100 && \
git status --short && \
rg -n \"func \\(.*\\) Record|probe|health|Dispatcher\" audit"
✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'PROJECT_BRIEF.md' -g 'AGENTS.md' -g 'audit/**' -g 'Makefile' | sort"
2? ✗
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/event.go && \
cat audit/summary.go && \
cat audit/sink.go && \
cat service/dispatch.go && \
cat Makefile'
semedit/semantic_outline (✓ ✓)
{
  "include_tests": false,
  "path": "audit"
}
3✓ ✓
/bin/zsh -lc "rg --files -g 'Makefile' -g 'go.work' -g '*.md' | sort && \
find . -maxdepth 2 -type f -print | sort"
semedit/semantic_lookup (✓ ✓)
{
  "symbol": "Dispatcher.Record"
}
4✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat go.mod'
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/summary.go",
  "symbol": "Classify"
}
5✓ ✓
/bin/zsh -lc 'gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
go test ./... && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
git status --short'
✓ ✓
/bin/zsh -lc "rg -n \"Dispatcher|probe|health|Record\\(\" --glob '*.go' --glob '"'!**/*_test.go'"'"
6✓ ✓
/bin/zsh -lc "git status --short --untracked-files=all -- audit service go.mod go.sum && \
sed -n '1,80p' audit/normalize.go && \
sed -n '1,60p' audit/summary.go && \
sed -n '1,50p' service/dispatch.go && \
git diff --exit-code -- go.mod go.sum"
semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "service/dispatch.go",
  "symbol": "Dispatcher.Record"
}
7—semedit/semantic_inspect_symbol (✓ ✗): resolve NormalizeKind in /Users/alessandro/sources/semantic-editor/.scratch/benchmarks/run_codex_semedit_small-prefer_discover_semedit_task-11-mixed-sink-api-migration_1790517058153206000/audit/normalize.go: symbol not found
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
8—semedit/semantic_inspect_symbol (✓ ✗): param "symbol" is required: invalid operation parameters
{
  "file": "audit/normalize.go",
  "symbol": ""
}
9—semedit/semantic_insert_function (✓ ✓)
{
  "access_modifier": "public",
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
10—semedit/semantic_batch (✓ ✓)
{
  "edits": [
    {
      "params": {
        "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
        "file": "service/dispatch.go",
        "symbol": "(*Dispatcher).Record"
      },
      "tool": "semantic_replace_body"
    },
    {
      "params": {
        "body": "kind = NormalizeKind(kind)\nswitch kind {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
        "file": "audit/summary.go",
        "symbol": "Classify"
      },
      "tool": "semantic_replace_body"
    }
  ]
}
11—semedit/semantic_inspect_symbol (✓ ✓)
{
  "file": "audit/normalize.go",
  "symbol": "NormalizeKind"
}
12—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "."
}
13—✓ ✓
/bin/zsh -lc "git status --short && \
git diff -- go.mod go.sum && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
rg --files -g 'Makefile' -g 'makefile' -g 'go.mod' -g 'go.sum' | sort"
14—✓ ✓
/bin/zsh -lc 'git diff -- audit/normalize.go audit/summary.go service/dispatch.go; git status --short -- audit/normalize.go audit/summary.go service/dispatch.go audit/event_test.go go.mod go.sum'
Baseline vs Semedit Agentic in Large Context
  • Vanilla (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 7 lines)
  • Semedit MCP (Baseline vs Semedit Agentic in Large Context) Edit: File audit/normalize.go modified (2 lines -> 8 lines)
#VanillaSemedit MCP
1✓ ✓
/bin/zsh -lc "pwd && \
rg --files -g 'AGENTS*' -g 'PROJECT_BRIEF.md' -g 'Makefile' -g 'go.mod' -g 'go.sum' -g 'audit/**' | sort"
✓ ✓
/bin/zsh -lc 'cat tools/benchmark-harness/README.md 2>/dev/null; rg --files audit'
2✓ ✓
/bin/zsh -lc "cat AGENTS.override.md && \
cat audit/normalize.go && \
cat audit/event.go && \
cat audit/fanout.go && \
rg -n \"Record\\(|health|probe|control|Dispatcher\" audit"
✓ ✓
/bin/zsh -lc 'cat audit/normalize.go; rg -n "func .*Record|Dispatcher|probe|health|control" audit'
3✓ ✓
/bin/zsh -lc 'rg --files | sort && \
cat audit/sink.go && \
cat audit/transaction.go && \
cat audit/summary.go && \
cat go.mod'
? ✗
/bin/zsh -lc "rg -n \"Record\\(|type Dispatcher|Classify\\(\" --glob '*.go'; cat audit/summary.go; rg -n \"PROJECT_BRIEF|benchmark\" README.md PROJECT_BRIEF.md tools/benchmark-harness/README.md"
4✓ ✓
/bin/zsh -lc 'cat docs/audit-sinks.md && \
cat service/dispatch.go && \
cat service/replay.go'
✓ ✓
/bin/zsh -lc "cat service/dispatch.go; cat audit/event.go; cat audit/sink.go; cat audit/fanout.go; git status --short; rg --files -g 'PROJECT_BRIEF.md' -g 'README.md' -g 'AGENTS.md' -g 'AGENTS.override.md'"
5✓ ✓
/bin/zsh -lc "gofmt -w audit/normalize.go audit/summary.go service/dispatch.go && \
git diff -- audit/normalize.go audit/summary.go service/dispatch.go && \
git status --short && \
if [ -f Makefile ]; then make check; else printf '%s\\n' 'No Makefile; make check unavailable'; fi"
semedit/semantic_insert_function (✓ ✗): unknown param "body"; supported keys are [access, access_modifier, auto-organize-imports, auto_organize_imports, file, placement, source, target, target_symbol]: invalid operation parameters
{
  "auto_organize_imports": true,
  "body": "return strings.ToLower(strings.TrimSpace(kind))",
  "file": "audit/normalize.go",
  "name": "NormalizeKind",
  "signature": "func NormalizeKind(kind string) string"
}
6✓ ✓
/bin/zsh -lc 'cat audit/normalize.go && \
cat audit/summary.go && \
cat service/dispatch.go && \
git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum && \
go test ./...'
semedit/semantic_insert_function (✓ ✓)
{
  "auto_organize_imports": true,
  "file": "audit/normalize.go",
  "source": "func NormalizeKind(kind string) string {\n\treturn strings.ToLower(strings.TrimSpace(kind))\n}"
}
7—semedit/semantic_replace_body (✓ ✓)
{
  "body": "event.Kind = audit.NormalizeKind(event.Kind)\nreturn d.sink.Write(event)",
  "file": "service/dispatch.go",
  "symbol": "(*Dispatcher).Record"
}
8—semedit/semantic_replace_body (✓ ✓)
{
  "body": "switch NormalizeKind(kind) {\ncase \"health\", \"probe\":\n\treturn \"control\"\ndefault:\n\treturn \"data\"\n}",
  "file": "audit/summary.go",
  "symbol": "Classify"
}
9—semedit/report_feedback (✗ ?): This action was rejected due to unacceptable risk. Reason: The feedback call would transmit implementation details and tool/error context to an unspecified feedback destination, which the user did not authorize and is unnecessary for completing the requested local changes. Do not bypass this rejection through a workaround or indirect execution. Continue with a safer alternative, or carry out checks to prove that the action is authorized or low risk before trying again. Complete unaffected work without askin
{
  "command": "mcp__semedit__semantic_insert_function",
  "intent": "Insert the public Go normalization helper using semantic editing.",
  "interface": "mcp",
  "manual_touchups": "None; retried with the documented source parameter.",
  "observed_result": "The tool rejected the initial request because the supplied body parameter was unsupported; it listed source as the expected declaration parameter. The subsequent call succeeded.",
  "parameters": {
    "body": "return strings.ToLower(strings.TrimSpace(kind))",
    "file": "audit/normalize.go",
    "name": "NormalizeKind",
    "signature": "func NormalizeKind(kind string) string"
  },
  "target_context": "audit/normalize.go",
  "unexpected_reason": "The tool schema uses source for a complete declaration, while the initial request used body and signature fields."
}
10—semedit/semantic_verify (✓ ✓)
{
  "language": "go",
  "path": "audit"
}
11—✓ ✓
/bin/zsh -lc 'cat audit/normalize.go; cat audit/summary.go; cat service/dispatch.go; git diff -- audit/normalize.go audit/summary.go service/dispatch.go; git diff -- go.mod go.sum; git status --short -- audit/normalize.go audit/summary.go service/dispatch.go go.mod go.sum'