The Driftproof receipt for triage on Claude Haiku 5.5, from Report 018, dated 2026-11-02, and what it can say.
triage on claude-haiku-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: +2332 input and -55 output tokens per call against no skill (measured, grading excluded).
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.854 | ± 0.047 | 3 |
| without the skill | 0.624 | ± 0.199 | 3 |
Lift +0.230, ± 0.205. 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 018 shows that reading.
What was verified
receipt_hash verified when this page was built from receipts/report-018/campaign-3/90573a77432fb1791c87bfd06bc8c4836deb8f3c412531f6daf2013b7ff94459.json; run.transcripts records retained-local.
Receipt hash: 6e3e4f32ce47371211e9c3b0972b8e969bd1fb43fa9637a46ae336dad04b3f97
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-018/campaign-3/90573a77432fb1791c87bfd06bc8c4836deb8f3c412531f6daf2013b7ff94459.json
npx driftproof@0.27.0 validate 90573a77432fb1791c87bfd06bc8c4836deb8f3c412531f6daf2013b7ff94459.json