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

prototype 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 skill0.869± 0.1263
without the skill0.532± 0.0863

Lift +0.337, ± 0.153. 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 separated without the skill 0.532 with the skill 0.869

What was verified

receipt_hash verified when this page was built from receipts/skill-measurements/published/47f9da585f12d468bcdb3b19e38fa79abda7b7aefa872eb897bbf3e41a627a48.json; run.transcripts records retained-local.

Receipt hash: cb33a80a2e7db6d3d612b4ea17dcd7648b245fe68eb6adc08989983b6e2a98db

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/47f9da585f12d468bcdb3b19e38fa79abda7b7aefa872eb897bbf3e41a627a48.json

npx driftproof@0.22.4 validate 47f9da585f12d468bcdb3b19e38fa79abda7b7aefa872eb897bbf3e41a627a48.json

Embed the badge

[![driftproof](https://driftproofhq.com/r/cb33a80a2e7db6d3d612b4ea17dcd7648b245fe68eb6adc08989983b6e2a98db/badge.svg)](https://driftproofhq.com/r/cb33a80a2e7db6d3d612b4ea17dcd7648b245fe68eb6adc08989983b6e2a98db/)