The Driftproof receipt for grill-with-docs on Claude Sonnet 5.5, dated 2026-10-18, and what it can say.
grill-with-docs on claude-sonnet-5-5
Regressed
A case separated downward 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 | 0.917 | ± 0.144 | 3 |
| without the skill | 0.979 | ± 0.019 | 3 |
Lift -0.063, ± 0.146. 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/ac5b69ff7c45c1fa4d4969f6aca2e2ac1844ec631ea41c9ea60626aeeaa5a462.json; run.transcripts records retained-local.
Receipt hash: 8ff7ff4aa7543fbb0deb23ee464666f7e83b3ec9ec034ba4f46cfcce71b2a8fc
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/ac5b69ff7c45c1fa4d4969f6aca2e2ac1844ec631ea41c9ea60626aeeaa5a462.json
npx driftproof@0.22.4 validate ac5b69ff7c45c1fa4d4969f6aca2e2ac1844ec631ea41c9ea60626aeeaa5a462.json