The Driftproof receipt for commit-message-conventions on Claude Haiku 4.5, dated 2026-09-17, and what it can say.
commit-message-conventions on claude-haiku-4-5-20251001
Passing
A case separated upward under the band rule. That is a separation detected under the rule, not proof that the skill moved the score.
Skill token cost: +819 input and +74 output tokens per call against no skill (measured, grading excluded).
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.822 | ± 0.108 | 10 |
| without the skill | 0.434 | ± 0.188 | 10 |
Lift +0.389, ± 0.217. A spread is the sample standard deviation of the per-case means: a descriptive spread with no coverage probability. The verdict above reads each case's two bands, not these aggregates.
What was verified
receipt_hash verified when this page was built from receipts/commit-message-conventions-claude-haiku-4-5-20251001-2026-09-17.json; run.transcripts records hashes-only.
Receipt hash: fad883d1018d3a4b3c75bc60b1eaec50032256cbf69fba3299999edf7978589c
Check this file yourself
validate shows that this file is unchanged since it was sealed. It does not show who made it or who sealed it.
curl -fsSLO https://raw.githubusercontent.com/driftproofhq/driftproof/main/receipts/commit-message-conventions-claude-haiku-4-5-20251001-2026-09-17.json
npx driftproof@0.28.0 validate commit-message-conventions-claude-haiku-4-5-20251001-2026-09-17.json