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

handoff on claude-sonnet-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-sonnet-5-5, 2026-10-18

The two arms

armmeanspread across casescases
with the skill0.940± 0.0673
without the skill0.796± 0.1493

Lift +0.145, ± 0.163. 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 0.796 with the skill 0.940

What was verified

receipt_hash verified when this page was built from receipts/skill-measurements/published/12be0aefad46c23d374e1127f18a35602d147406a40e718ddec87b1fa19449fd.json; run.transcripts records retained-local.

Receipt hash: 4a48502d6e950adac2c40f49b84d5d1f7c3863aa8724cfb3aeb4603f7b3b70d9

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/12be0aefad46c23d374e1127f18a35602d147406a40e718ddec87b1fa19449fd.json

npx driftproof@0.22.4 validate 12be0aefad46c23d374e1127f18a35602d147406a40e718ddec87b1fa19449fd.json

Embed the badge

[![driftproof](https://driftproofhq.com/r/4a48502d6e950adac2c40f49b84d5d1f7c3863aa8724cfb3aeb4603f7b3b70d9/badge.svg)](https://driftproofhq.com/r/4a48502d6e950adac2c40f49b84d5d1f7c3863aa8724cfb3aeb4603f7b3b70d9/)