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The Driftproof receipt for handoff on Claude Opus 5.5, dated 2026-10-18, and what it can say.

handoff on claude-opus-5-5

Run on 2026-10-18, runner 0.22.2, surface claude-cli, verification level TESTED.

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.

driftproof badge: passing on claude-opus-5-5, 2026-10-18

The two arms

armmeanspread across casescases
with the skill0.914± 0.0383
without the skill0.839± 0.1403

Lift +0.075, ± 0.145. 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.

The two arms of this receipt drawn as ranges, with the effect floor marked. 0 0.25 0.5 0.75 1 overlapping without the skill 0.839 with the skill 0.914

What was verified

receipt_hash verified when this page was built from receipts/skill-measurements/published/7fab8934a4927378989d6b954d75dc3b5ed5262794b56426daf797a39e77f563.json; run.transcripts records retained-local.

Receipt hash: 3a16514eccd114d610fb04b781d660e0af81979acafa6017f36613cf595e5147

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/7fab8934a4927378989d6b954d75dc3b5ed5262794b56426daf797a39e77f563.json

npx driftproof@0.22.4 validate 7fab8934a4927378989d6b954d75dc3b5ed5262794b56426daf797a39e77f563.json

Embed the badge

[![driftproof](https://driftproofhq.com/r/3a16514eccd114d610fb04b781d660e0af81979acafa6017f36613cf595e5147/badge.svg)](https://driftproofhq.com/r/3a16514eccd114d610fb04b781d660e0af81979acafa6017f36613cf595e5147/)