security-audit is a coding-agent skill that coordinates a multi-phase security audit of a software repository, from architecture discovery and vulnerability hunting through validation, reporting, structured output, and independent verification. It is used to find exploitable security issues while having separate agents challenge potential findings and check their claims against the source code.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add cloudflare/security-audit-skill --skill security-auditgit clone --depth 1 https://github.com/cloudflare/security-audit-skillWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/cloudflare/security-audit-skill/security-audit)<a href="https://agentmods.dev/skills/cloudflare/security-audit-skill/security-audit"><img src="https://agentmods.dev/badge/skills/cloudflare/security-audit-skill/security-audit/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/cloudflare/security-audit-skill/security-audit"><img src="https://agentmods.dev/badge/skills/cloudflare/security-audit-skill/security-audit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk warn
- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00072 | $0.04447 |
| Opus 5.5 | $0.00029 | $0.01779 |
| Sonnet 5.5 | $0.00014 | $0.00889 |
| Haiku 4.5 | $0.00007 | $0.00445 |
Grade A, and why
security-audit scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
3 near-identical copies found in the catalogue:
- security-audit — 100% identical, 216 lines differ
- security-audit — 94% identical, 213 lines differ
- security-audit — 92% identical, 217 lines differ
How it starts
The opening of the file, as written. The whole thing — 193 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Security Audit
Find vulnerabilities that violate a real trust boundary, then give owners the source evidence, safe reproduction, priority, and smallest effective fix. This is a defensive, source-first workflow. A candidate without a concrete affected principal, resource, or security outcome is not a confirmed finding.
Operating modes
This skill is guidance by default. Loading it does not authorize the complete audit workflow or file creation.
- Guidance mode: For security questions, focused reviews, methodology, triage, or investigation of specific findings, use only the relevant parts of this skill. Do not automatically run all six phases, create an output directory, or write audit artifacts. You may launch focused agents when useful; they return results to the current task.
- Full audit mode: Use the complete workflow when the user explicitly asks to audit or pen-test a codebase, asks for a full, comprehensive, or end-to-end security review, or requests report artifacts. Run all six phases and write the files defined below.
If the request could mean either mode, ask one focused question before creating files or starting the complete workflow.
Platform terminology
This skill is agent-neutral:
- Parent is the agent that coordinates the run and owns shared state.
- Task tool is the platform's delegation or sub-agent mechanism.
researchagent is a delegated agent for focused source exploration and factual verification.generalagent is a delegated agent for broad investigation and bounded local execution.subagent_type:in a heading names which of these two delegated agent roles runs that work.
Use equivalent platform capabilities while preserving role, write-isolation, prompt, and independence boundaries.
Universal execution safety
These rules apply in both operating modes. Source inspection is read-only. Run target-controlled builds, tests, processes, browsers, emulators, fuzzers, and fixture processing only inside an OS-enforced sandbox that provides all of these controls:
What ships with it
19 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- AI-AND-LLM.md 10 KB
- ATTACK-CLASSES.md 15 KB
- CLIENT-SIDE.md 8.4 KB
- CLOUD-AND-DEPLOYMENT.md 8.1 KB
- DATA-ISOLATION-AND-LIFECYCLE.md 7.6 KB
- DESKTOP-MOBILE-AND-LOCAL-IPC.md 8.5 KB
- HUNTING.md 22 KB
- MEMORY-SAFETY-AND-BINARY.md 10 KB
- PROTOCOLS-RPC-AND-MESSAGING.md 7.3 KB
- RECONNAISSANCE.md 16 KB
- report-schema.json 14 KB
- RESOURCE-EXHAUSTION-AND-AVAILABILITY.md 7.3 KB
- SUPPLY-CHAIN-AND-RELEASE.md 7.1 KB
- validate-coverage-ledger.cjs 33 KB runs code
- validate-coverage-ledger.test.cjs 28 KB runs code
- validate-findings.cjs 28 KB runs code
- validate-findings.test.cjs 26 KB runs code
- VALIDATION-AND-REPORTING.md 17 KB
- WEB-PROTOCOL-AND-AUTH.md 12 KB
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago Changed · +15 lines · +7 tokens per session 5e3e96a1e438
- 1mo ago Changed · +69 lines · -5 tokens per session 20dcfe14ff1a
- 1mo ago First seen · 109 lines · 70 tokens per session scan A 928503b4eb74
security-audit is a skill published in the GitHub repository cloudflare/security-audit-skill (30,790 stars, last pushed 1mo ago), licensed MIT. It adds 72 tokens to every session and 4,447 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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