The Driftproof receipt for crafting-effective-readmes on Claude Opus 4.8, from Report 003, dated 2026-08-11, and what it can say.
crafting-effective-readmes on claude-opus-4-8
Not measured
This receipt carries no verdict: it does not record that a model answered the run.
Skill token cost: about +669 input tokens per call, estimated from the SKILL.md length (not measured).
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.760 | ± 0.213 | 7 |
| without the skill | 0.870 | ± 0.041 | 7 |
No lift is stated for a state that did not measure one. 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/report-003/crafting-effective-readmes__claude-opus-4-8.json; run.transcripts records retained-local.
Receipt hash: c7e5987bd3ca0cb248c552964262ad6fe938e2391ef95ecc962e710178902c72
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/report-003/crafting-effective-readmes__claude-opus-4-8.json
npx driftproof@0.28.0 validate crafting-effective-readmes__claude-opus-4-8.json