The Driftproof receipt for triage on Claude Opus 5.5, dated 2026-10-18, and what it can say.
triage on claude-opus-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 | 1.000 | ± 0.000 | 3 |
| without the skill | 0.688 | ± 0.234 | 3 |
Lift +0.313, ± 0.234. 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/6e5bc88b0e236f40f0898ed7472d68d3e89ab11b85a7a030ab359d2cf93b6f02.json; run.transcripts records retained-local.
Receipt hash: 058af364c80784af746573b4afdc64c4a2af39341ebeb1b640787bc9f793e1e1
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/6e5bc88b0e236f40f0898ed7472d68d3e89ab11b85a7a030ab359d2cf93b6f02.json
npx driftproof@0.22.4 validate 6e5bc88b0e236f40f0898ed7472d68d3e89ab11b85a7a030ab359d2cf93b6f02.json