---

name: rescue-optimization description: Salvages optimization work lacking benchmarks. Generates missing evidence, validates claims. Bugs discovered during rescue are valuable - invoke /validate-correctness.

Optimization Rescue

Salvage optimization work done without proper benchmarks. Generate evidence, validate claims, and discover bugs hiding in "optimizations."

Valuable Outcomes

Bugs found during rescue are SUCCESS, not failure.

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Phase 0: Pre-flight

Run /preflight first.

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Phase 1: Audit

Copygit diff --name-only origin/main...HEAD | grep '\.go$'

For each change, categorize:

• Preallocation
• Pooling
• Buffer reuse
• Data structure change
• Potential bug (suspicious patterns)

---

Phase 2: Triage

Bug Warning Signs

• make([]T, n) followed by append
• Missing nil checks
• Changed return semantics
• Slice aliasing

---

Phase 3: Generate Evidence

Create Benchmarks

Copyfunc BenchmarkFunction(b *testing.B) {
    data := createTestData()
    b.ReportAllocs()
    b.ResetTimer()
    for i := 0; i < b.N; i++ {
        _ = Function(data)
    }
}

Run Comparison

Copybenchstat /tmp/baseline.txt /tmp/optimized.txt

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Phase 4: Validate

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Phase 5: Handle Bug Discovery

If rescue uncovers a bug instead of an optimization:

Copy/validate-correctness

After validation:

1. Record bug in validations.yaml (via validate-correctness)
2. Record rescue as BUG_FOUND in rescues.yaml
3. The bug fix becomes part of rescued branch (with tests!)

---

Phase 6: Reconstruct

Copygit checkout main
git checkout -b mem-opt/<name>-rescued

Apply only:

• KEEP changes (validated optimizations)
• BUG_FOUND changes (with tests from /validate-correctness)

Discard everything else.

---

Phase 7: Record

Copy# Append to rescues.yaml
  - branch: mem-opt/original
    date: 2026-01-06
    audited: 12
    kept: 3
    discarded: 7
    bugs_found: 2
    rescued_as: mem-opt/original-rescued
    lesson: "<pattern>"

---

Usage

Copy/rescue-optimization