The Driftproof receipt for agent-browser on Claude Sonnet 5.5, dated 2026-11-01, and what it can say.
agent-browser on claude-sonnet-5-5
No verdict: delegated skill not tested
These text tasks test the router's written response, not the delegated skill. Report 015 Amendment 1.
The two arms
| arm | mean | spread across cases | cases |
|---|---|---|---|
| with the skill | 0.856 | ± 0.064 | 3 |
| without the skill | 0.776 | ± 0.113 | 3 |
These arm summaries describe the recorded answers. They do not measure the delegated skill. A spread is the sample standard deviation of the per-case means: a descriptive spread with no coverage probability. No verdict is assigned to these text tasks.
This receipt also reads the skill against a same-length placebo. Report 017 shows that reading.
What was verified
receipt_hash verified when this page was built from receipts/report-017c/campaign-1/a48c0a427ed6c47df40680e4c6f57aad8e89b9d80a5673c04a6384c2f16c23f9.json; run.transcripts records retained-local.
Receipt hash: 5c56836a4ec21cb3cda2ad5552f4b4bb53876b72e5a512def9b632a948488a3e
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-017c/campaign-1/a48c0a427ed6c47df40680e4c6f57aad8e89b9d80a5673c04a6384c2f16c23f9.json
npx driftproof@0.27.0 validate a48c0a427ed6c47df40680e4c6f57aad8e89b9d80a5673c04a6384c2f16c23f9.json