The Driftproof receipt for setup-matt-pocock-skills on Claude Sonnet 5.5, dated 2026-10-18, 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.
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.930 | ± 0.082 | 3 |
| without the skill | 0.690 | ± 0.103 | 3 |
Lift +0.240, ± 0.132. 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/skill-measurements/published/4a816239a96f2989b32764676989b082b6d5a23c905f8edffb0671783e2fdd70.json; run.transcripts records retained-local.
Receipt hash: 6983aa785fcd5d04730835a4a3b24ad45d0692ce4b95521bddaf31150a8e1f86
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/skill-measurements/published/4a816239a96f2989b32764676989b082b6d5a23c905f8edffb0671783e2fdd70.json
npx driftproof@0.22.4 validate 4a816239a96f2989b32764676989b082b6d5a23c905f8edffb0671783e2fdd70.json