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 agentmods add skills/fusengine/agents/auth-auditnpx skills add fusengine/agents --skill auth-auditgit clone --depth 1 https://github.com/fusengine/agentsWrote 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/fusengine/agents/auth-audit)<a href="https://agentmods.dev/skills/fusengine/agents/auth-audit"><img src="https://agentmods.dev/badge/skills/fusengine/agents/auth-audit.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00031 | $0.00475 |
| Opus 5 | $0.00015 | $0.00237 |
| Sonnet 5 | $0.00006 | $0.00095 |
| Haiku 4.5 | $0.00003 | $0.00047 |
Grade A, and why
auth-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 yesterday.
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.
What it actually says
It runs a fixed workflow — detect the auth implementation, scan for known anti-patterns,
verify cryptographic choices, check token/session lifecycle, and audit authorization logic
(RBAC/ABAC) — checking for vulnerabilities such as JWT signed with none, undersized JWT
secrets, missing/too-long token expiration, refresh tokens in localStorage, session fixation,
missing CSRF protection, and OAuth flows missing PKCE or the state parameter.
Auth Audit Skill
Overview
Comprehensive audit of authentication and authorization implementations.
Audit Categories
| Category | Checks |
|---|---|
| JWT | Signing algo, expiration, refresh, storage |
| Sessions | Storage, expiry, regeneration, fixation |
| OAuth2 | PKCE, state param, redirect validation |
| Passwords | Hashing algo, strength rules, reset flow |
| MFA | Implementation, backup codes, recovery |
Workflow
- Detect auth implementation (JWT, sessions, OAuth)
- Scan for known anti-patterns
- Verify cryptographic choices
- Check token/session lifecycle
- Audit authorization logic (RBAC, ABAC)
Common Vulnerabilities
- JWT signed with
nonealgorithm - JWT secret too short (< 256 bits)
- No token expiration or too long
- Refresh tokens stored in localStorage
- Session fixation after login
- Missing CSRF protection
- OAuth without PKCE for public clients
- Missing
stateparameter in OAuth flow
References
What ships with it
2 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.
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.
- yesterday First seen · 60 lines · 31 tokens per session scan A c33e7eb595d2
auth-audit is a skill published in the GitHub repository fusengine/agents (25 stars, last pushed today), licensed MIT. It adds 31 tokens to every session and 475 once invoked, about $0.0002 per session on Opus 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 2026-09-03.
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