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Phy Jwt Auth Audit

Category: Security  ·  Sub-category: identity-access  ·  Last updated:
type:audit
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, token compared with ==, auth bypass via role:admin in payload. Generates a severity-ranked report with exact code locations and fixes. Zero external API — pure local analysis. Triggers on "JWT audit", "token security", "auth security", "alg none", "OAuth scopes", "bearer token", "token expiry", "/jwt-audit".

About this skill (catalog notes)

Phy Jwt Auth Audit includes 17 code blocks for direct copy-paste. At roughly 2,381 words the SKILL.md is on the longer end of the catalog distribution.

Source
myclaw.ai
License
MIT
Original author
ndesv21
Indexed lastmod
Catalog position
Security · identity-access
Indexed related skills
10

How Phy Jwt Auth Audit fits the catalog

Phy Jwt Auth Audit sits in the Security category under the identity-access sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

From the source SKILL.md

A developer pastes a JWT into a debug log. The logger ships it to Datadog. An attacker finds it in the logs 6 months later. The token never expires.

What this skill does

Phy Jwt Auth Audit is a community-contributed Claude Code skill in the identity-access sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/phy-jwt-auth-audit/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Phy Jwt Auth Audit Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 116,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/phy-jwt-auth-audit
curl -L https://claudskills.com/skills/phy-jwt-auth-audit/SKILL.md \
  -o ~/.claude/skills/phy-jwt-auth-audit/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/phy-jwt-auth-audit/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/phy-jwt-auth-audit/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\phy-jwt-auth-audit\SKILL.md on Windows. See the full install guide for step-by-step instructions.

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Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

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Frequently asked questions

How do I install the Phy Jwt Auth Audit Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/phy-jwt-auth-audit/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Phy Jwt Auth Audit skill do?
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, token compared with ==, auth bypass via role:admin in payload. Generates a severity-ranked report with exact code locations and fixes. Zero external API — pure local analysis. Triggers on "JWT audit", "token security", "auth security", "alg none", "OAuth scopes", "bearer token", "token expiry", "/jwt-audit".
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Phy Jwt Auth Audit skill?
Use Phy Jwt Auth Audit when your Claude Code task falls under the Security category — specifically in the identity access area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Phy Jwt Auth Audit" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Phy Jwt Auth Audit skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Phy Jwt Auth Audit is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
ndesv21. (2026). Phy Jwt Auth Audit [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/phy-jwt-auth-audit/
BibTeX
@misc{phy-jwt-auth-audit-2026,
  author    = {ndesv21},
  title     = {Phy Jwt Auth Audit [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/phy-jwt-auth-audit/}
}

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