The Driftproof receipt for agent-browser on Claude Haiku 5.5, from Report 018, dated 2026-11-02, and what it can say.
agent-browser on claude-haiku-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 | 0.772 | ± 0.103 | 3 |
| without the skill | 0.655 | ± 0.149 | 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 018 shows that reading.
What was verified
receipt_hash verified when this page was built from receipts/report-018/campaign-3/a0249d04c527d224090444faa7fc00f860683be12e2caf9e1d873b043fbbe37b.json; run.transcripts records retained-local.
Receipt hash: 02dce995f39328ca851e2fc448150d32e07dbb573e9e3196f97c1b2ff6a65b09
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-018/campaign-3/a0249d04c527d224090444faa7fc00f860683be12e2caf9e1d873b043fbbe37b.json
npx driftproof@0.27.0 validate a0249d04c527d224090444faa7fc00f860683be12e2caf9e1d873b043fbbe37b.json