The Driftproof receipt for reddit-automation on Claude Opus 5.5, dated 2026-10-18, and what it can say.
reddit-automation on claude-opus-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 | 0.800 | ± 0.030 | 3 |
| without the skill | 0.914 | ± 0.061 | 3 |
Lift -0.114, ± 0.068. 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/3a899aa3330b1626469f4ef0106667285bda11c26c42b23f7686a7e0d7392d47.json; run.transcripts records retained-local.
Receipt hash: 143892731599c834f6f87b10c1dafac74e3199df65bfce3ad103313832e22bcb
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/3a899aa3330b1626469f4ef0106667285bda11c26c42b23f7686a7e0d7392d47.json
npx driftproof@0.22.4 validate 3a899aa3330b1626469f4ef0106667285bda11c26c42b23f7686a7e0d7392d47.json