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Jwt Decoder

Checked
aidotnet·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 aidotnet/moyucode --skill jwt-decoder -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

aidotnet

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

    Only contacts known or declared hosts: github.com.

    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.

    Hosts contacted

    github.comsource host

  • 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 aidotnet/moyucode at 9fa0412ff1.

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

Commit
9fa0412ff1
Manifest
skills/tools/jwt-decoder/SKILL.md
Scanned
2 files, 161 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

The jwt-decoder skill allows an AI agent to decode JSON Web Tokens (JWTs). It extracts claims from a JWT, such as the subject, issuer, and expiration time. This is useful for verifying user authentication and authorization in systems that use JWTs.

When to use it

  • Authentication Verification: Determine if a provided JWT is valid and contains expected user information.
  • Authorization Checks: Extract roles or permissions from a JWT to control access to resources.
  • Token Inspection: Analyze the contents of a JWT for debugging or security auditing purposes.
  • Integration with APIs: Decode JWTs received from external APIs to process authenticated requests.

Key capabilities

  • Decodes JWT tokens.
  • Extracts claims from decoded JWTs.
  • Supports standard JWT claim types.

Example prompts

  • "Decode this JWT: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjMiLCJleHAiOjE2OTA3NzYwMDB9.q-Wj_7mU0xVnQvK8zH4rTfJgN1tP6QG5uC3yXhRkL0"
  • "What is the subject of this JWT: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjMiLCJleHAiOjE2OTA3NzYwMDB9.q-Wj_7mU0xVnQvK8zH4rTfJgN1tP6QG5uC3yXhRkL0"
  • “Is this JWT expired: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjMiLCJleHAiOjE2ODA3NzYwMDB9.q-Wj_7mU0xVnQvK8zH4rTfJgN1tP6QG5uC3yXhRkL0"

Tips & gotchas

  • Ensure the AI agent has access to the JWT string for decoding.
  • The skill's effectiveness depends on the validity of the JWT itself (signature verification, etc.). It does not perform signature validation.