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phy-jwt-auth-audit

95 / 100 · Low risk

Fine to try. Some of what it can do is expected: a security skill usually runs scanners and checks websites.

By LeoYeAI/agent-master-skills (GitHub) · security · 2,186 stars · scanned at commit 8f88f9a

JWT and OAuth/OIDC security auditor. Decodes any JWT token (without verification) to inspect alg/exp/iss/aud/scope claims, detects the "alg:none" bypass vulnerability, expired or no-expiry tokens, overly broad OAuth scopes, JWT stored in localStorage (XSS theft risk), JWT in URL parameters (log leakage), missing issuer/audience validation in source code, hardcoded tokens in .env files, and weak HMAC secrets. Also scans source files for insecure token handling patterns: Bearer token logged, toke…

Works with any agent that supports SKILL.md skills.

What this skill can do

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'phy-jwt-auth-audit' ] || [ -L ~/.agents/skills/'phy-jwt-auth-audit' ]; then echo 'A skill folder named phy-jwt-auth-audit already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/LeoYeAI/agent-master-skills' "$d" && git -C "$d" checkout --quiet '8f88f9a0dd5a1075d4f0c7626f9d960844d57575' -- 'skills/phy-jwt-auth-audit' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/phy-jwt-auth-audit' ~/.agents/skills/'phy-jwt-auth-audit' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'phy-jwt-auth-audit' ~/.claude/skills/'phy-jwt-auth-audit' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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