The Driftproof receipt for design-mobile-apps on Claude Sonnet 5.5, dated 2026-10-18, and what it can say.
design-mobile-apps on claude-sonnet-5-5
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.
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.889 | ± 0.106 | 3 |
| without the skill | 0.774 | ± 0.077 | 3 |
Lift +0.115, ± 0.131. 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/fb976fc22298c56e46e6a4bccefcee5b3b2a66eb49ea2ab297aa220f28f3c3af.json; run.transcripts records retained-local.
Receipt hash: ea6c4a25fbedb8012f5ad2eb94eebdc68a77247a3183f9696d53d6c8940fd273
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/fb976fc22298c56e46e6a4bccefcee5b3b2a66eb49ea2ab297aa220f28f3c3af.json
npx driftproof@0.22.4 validate fb976fc22298c56e46e6a4bccefcee5b3b2a66eb49ea2ab297aa220f28f3c3af.json