The Driftproof receipt for commit-message-conventions on Claude Haiku 4.5, dated 2026-11-08, and what it can say.
commit-message-conventions on claude-haiku-4-5-20251001
Regressed
A case separated downward under the band rule. That is a separation detected under the rule, not proof that the skill moved the score.
Skill token cost: +1078 input and +189 output tokens per call against no skill (measured, grading excluded).
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.831 | ± 0.080 | 10 |
| without the skill | 0.482 | ± 0.243 | 10 |
Lift +0.349, ± 0.256. 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-4-5-20251001-2026-11-08.json; run.transcripts records hashes-only.
Receipt hash: cb3b424d6f7b12d4e1785619b8a3e388610d1570ee52f0b6197b2c5e5deb736b
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-4-5-20251001-2026-11-08.json
npx driftproof@0.28.0 validate commit-message-conventions-claude-haiku-4-5-20251001-2026-11-08.json