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bench

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Formal benchmark harness. Runs a metric command N times across 2-3 variants (git refs or state-prep shell commands), checks variance, computes delta vs. declared baseline, and emits a reproducible TSV plus a one-paragraph summary. Read-only to source. Inspired by caveman's 3-arm eval.

skills/bench/SKILL.md

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Aug 28, 2026
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MIT

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## Activate When
- `/godmode:bench`, "benchmark", "compare variants", "A/B metric"
- User has a metric and wants a statistically-honest comparison between 2-3 code states
- NOT for optimization loops — use `optimize` for that. `bench` measures, never modifies source.

## Inputs
Ask once, cache for the session:
- `metric_cmd` — shell command printing ONE number to stdout (lower-is-better or higher-is-better, user declares `direction`).
- `variants` — list of 2-3 entries. Each variant is a record:
  - `name` — short label (e.g. `main`, `terse_on`, `feature_branch`)
  - `prep` — EITHER a git ref (`git checkout <ref>`) OR an inline shell command that puts the repo into the desired state (e.g. `export GODMODE_TERSE=1`, `git checkout feature-branch`)
  - `teardown` — optional shell command to undo `prep` (default: `git checkout -` for refs, `unset VAR` for env)
- `baseline` — name of the variant all deltas are computed against. Must match one `variants[].name`.
- `N` — runs per variant. Default 5. Minimum 3. Maximum 20.
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