Driftproof
Menu

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

find-skills on claude-sonnet-5-5

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

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.

driftproof badge: regressed on claude-sonnet-5-5, 2026-10-18

The two arms

armmeanspread across casescases
with the skill0.853± 0.1003
without the skill0.944± 0.0593

Lift -0.091, ± 0.116. 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 0.944 with the skill 0.853

What was verified

receipt_hash verified when this page was built from receipts/skill-measurements/published/55e499f055d657d74ea5c5bf0887eda697a500ec1f817fc69aa82d5fd7d27b6d.json; run.transcripts records retained-local.

Receipt hash: e2403573b7370d33e8b7d18f8287d7a90abe1ed18feb1cab482baa909f0b7b67

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/55e499f055d657d74ea5c5bf0887eda697a500ec1f817fc69aa82d5fd7d27b6d.json

npx driftproof@0.22.4 validate 55e499f055d657d74ea5c5bf0887eda697a500ec1f817fc69aa82d5fd7d27b6d.json

Embed the badge

[![driftproof](https://driftproofhq.com/r/e2403573b7370d33e8b7d18f8287d7a90abe1ed18feb1cab482baa909f0b7b67/badge.svg)](https://driftproofhq.com/r/e2403573b7370d33e8b7d18f8287d7a90abe1ed18feb1cab482baa909f0b7b67/)