The Driftproof receipt for setup-matt-pocock-skills on Claude Haiku 5.5, dated 2026-11-08, and what it can say.
setup-matt-pocock-skills on claude-haiku-5-5
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: +1579 input and +291 output tokens per call against no skill (measured, grading excluded).
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.813 | ± 0.100 | 3 |
| without the skill | 0.647 | ± 0.125 | 3 |
Lift +0.167, ± 0.160. 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/which-section/setup-matt-pocock-skills/compare-B-3517654bcdb0c2f3ad9cc03e02319eb7bda47d92331bc964f9ee2db5837b4926.json; run.transcripts records hashes-only.
Receipt hash: 3517654bcdb0c2f3ad9cc03e02319eb7bda47d92331bc964f9ee2db5837b4926
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/which-section/setup-matt-pocock-skills/compare-B-3517654bcdb0c2f3ad9cc03e02319eb7bda47d92331bc964f9ee2db5837b4926.json
npx driftproof@0.28.0 validate compare-B-3517654bcdb0c2f3ad9cc03e02319eb7bda47d92331bc964f9ee2db5837b4926.json