The Driftproof receipt for setup-matt-pocock-skills on Claude Sonnet 5.5, dated 2026-11-01, and what it can say.
setup-matt-pocock-skills on claude-sonnet-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: +2600 input and +78 output tokens per call against no skill (measured, grading excluded).
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.893 | ± 0.081 | 3 |
| without the skill | 0.671 | ± 0.079 | 3 |
Lift +0.222, ± 0.114. 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.
This receipt also reads the skill against a same-length placebo. Report 017 shows that reading.
What was verified
receipt_hash verified when this page was built from receipts/report-017c/campaign-1/bc5ec12a6870b996beb276f1f680e26be3028563f754675d8a75fbf84767c474.json; run.transcripts records retained-local.
Receipt hash: 176b26bcac810bddb1878dc76b1503232d7ccc6bff62c8e8fb022180f3487c78
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/report-017c/campaign-1/bc5ec12a6870b996beb276f1f680e26be3028563f754675d8a75fbf84767c474.json
npx driftproof@0.27.0 validate bc5ec12a6870b996beb276f1f680e26be3028563f754675d8a75fbf84767c474.json