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: +2597 input and +236 output tokens per call against no skill (measured, grading excluded).
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.912 | ± 0.102 | 3 |
| without the skill | 0.633 | ± 0.130 | 3 |
Lift +0.279, ± 0.165. 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-A-de973b2be878049b7c236e782010db51004d5c73d4a2f150de890e02c2ec78d4.json; run.transcripts records hashes-only.
Receipt hash: de973b2be878049b7c236e782010db51004d5c73d4a2f150de890e02c2ec78d4
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-A-de973b2be878049b7c236e782010db51004d5c73d4a2f150de890e02c2ec78d4.json
npx driftproof@0.28.0 validate compare-A-de973b2be878049b7c236e782010db51004d5c73d4a2f150de890e02c2ec78d4.json