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Jwt Misuse Anti Pattern

Checked
igbuend·vlatest·security·MIT

Provides JWT guidance and assistance for implementing security and authentication.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add igbuend/grimbard --skill jwt-misuse-anti-pattern -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

igbuend

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned igbuend/grimbard at cde088f5d7.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
cde088f5d7
Manifest
skills/jwt-misuse-anti-pattern/SKILL.md
Scanned
1 file, 276 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

This skill identifies common misuses and vulnerabilities associated with JSON Web Tokens (JWTs). It can detect insecure JWT implementations, such as using weak signing algorithms or failing to validate token expiration. The tool helps developers understand how JWTs can be exploited and provides guidance on secure implementation practices.

When to use it

  • Code Review: Analyze existing codebases that utilize JWT for authentication and authorization to identify potential vulnerabilities.
  • Security Audits: Integrate into security audit processes to proactively find JWT-related weaknesses.
  • Development Guidance: Assist developers in implementing secure JWT practices during the development lifecycle.
  • Threat Modeling: Use it as part of threat modeling exercises to understand and mitigate risks associated with JWT usage.

Key capabilities

  • Identification of weak signing algorithms (e.g., HS256 used with a shared secret).
  • Detection of missing or incorrect token expiration validation.
  • Recognition of common JWT injection vulnerabilities.
  • Provides remediation suggestions for identified issues.

Example prompts

  • "Analyze this code snippet for potential JWT security flaws: [code]"
  • "What are the most common ways JWTs can be misused?"
  • "How do I ensure proper expiration validation when using JWTs in my application?"

Tips & gotchas

This skill requires a basic understanding of JSON Web Tokens and their role in authentication. The analysis provided is based on known patterns; it's not exhaustive, and may require manual verification by security experts for complex implementations.