The Driftproof receipt for grill-with-docs on Claude Sonnet 5.5, dated 2026-11-08, 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.
Skill token cost: +101 input and +273 output tokens per call against no skill (measured, grading excluded).
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.892 | ± 0.128 | 3 |
| without the skill | 0.986 | ± 0.013 | 3 |
Lift -0.094, ± 0.129. 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/canary/2026-11-08/grill-with-docs-claude-sonnet-5-5-2026-11-08-7ee1c4663d56.json; run.transcripts records hashes-only.
Receipt hash: 7ee1c4663d563e5f355166495e0fe868a9f745143b96fb75828b1bbd21750d9f
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/canary/2026-11-08/grill-with-docs-claude-sonnet-5-5-2026-11-08-7ee1c4663d56.json
npx driftproof@0.28.0 validate grill-with-docs-claude-sonnet-5-5-2026-11-08-7ee1c4663d56.json