Turn Claude Into Your App's Security Team With Cloudflare's Open-Source Auditor
Cloudflare's security team released the skill behind its own vulnerability hunting. What it does, how to install it in Claude Code, the one prompt that starts an audit, and the catches
2min read
2prompts to copy
6numbered steps
7sections
Cloudflare open-sourced a skill that turns your coding agent into a security auditor. In Claude Code it splits the job across separate Claudes: one maps your app, a team hunts for holes, and fresh Claudes try to disprove every finding, so what's left is backed by the code itself.
What happens in an audit
- Reconnaissance: maps your architecture, trust boundaries and every input surface into architecture.md and coverage-ledger.json.
- Coverage-led hunting: isolated hunters take units from that ledger, and coverage critics look for gaps nobody checked.
- Candidate validation: every unique candidate goes to a fresh verifier whose job is to disprove it.
- Structured output: findings.json sorts each record into confirmed, needs_validation or rejected.
- Independent record verification: fresh agents re-check the final source claims.
- Reporting: REPORT.md, FINDINGS-DETAIL.md and NEEDS-VALIDATION.md.
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Get the full setup steps + the copy-paste setup prompt
The rest of this guide (6 more sections, 2 copy-paste prompts) opens right here. The setup prompt, one paste into Claude that sets it all up, comes by email only. Use your real address.
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