API Authentication Testing

API Authentication Testing is a Quality skill for Claude Code, published by xalgord in xalgorix.

852 stars153 forkson xalgord/xalgorixAdded 2026/08/12+1% in starsRepository updated 2026/08/11

ai-agentai-securityautomationautonomous-pentestingbug-bountycybersecurityethical-hackinggolangpenetration-testingpentestpentesting-toolsreconsecuritysecurity-researchsecurity-toolstypescriptvulnerability-detectionvulnerability-scanner

Install in seconds

Install API Authentication Testing

Copy API Authentication Testing into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/xalgorix/xalgorix/tree/main/internal/tools/skills/data/api-security/testing-api-authentication-weaknesses ~/.claude/skills/testing-api-authentication-weaknesses

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/xalgorix/xalgorix.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: internal/tools/skills/data/api-security/testing-api-authentication-weaknesses/SKILL.md in xalgord/xalgorix
Installs to: ~/.claude/skills/testing-api-authentication-weaknesses
Collection: One of 51 skills cataloged from this repository
Category: Quality — 1354 skills

What API Authentication Testing does

API Authentication Testing checks REST API auth for bypasses, weak JWT validation, exposed endpoints, and token lifecycle issues. Use it when validating login, session, refresh, or API key protections before release.

API Authentication Testing is cataloged under Quality on DirSkills. API Authentication Testing comes from a repository tagged ai-agent, ai-security, automation, autonomous-pentesting and bug-bounty.

Documentation

README

Excerpt

Testing API Authentication Weaknesses

When to Use

Assessing REST API authentication mechanisms for bypass vulnerabilities before production deployment
Testing JWT token implementation for common weaknesses (none algorithm, key confusion, missing expiration)
Evaluating whether all API endpoints enforce authentication or if some are unintentionally exposed
Testing API key generation, storage, and rotation mechanisms for predictability or leakage
Validating session management including token expiration, revocation, and refresh token security

Do not use without written authorization. Authentication testing involves attempting to bypass security controls.

Most Often Missed & How to Confirm

This is the opening of the README. Read the full README on GitHub.

Commands API Authentication Testing provides

Slash commands named in this skill’s SKILL.md, listed in the order they first appear.

/health
/metrics
/actuator
/debug

Frequently asked about API Authentication Testing

What else does xalgord publish alongside API Authentication Testing?
API Authentication Testing is one of 51 skills that DirSkills catalogs from xalgord/xalgorix, the repository it ships in. Its siblings there include AFL++ Fuzzing, AI Security Guardrails and AI-Assisted Vulnerability Discovery. Each one is a separate skill with its own page in this directory, installs the same way API Authentication Testing does, and is maintained by xalgord in that same repository. The rest of the collection is listed on the xalgord/xalgorix page.
How does API Authentication Testing compare to other Quality skills?
API Authentication Testing ranks #912 by stars among the 1354 Quality skills in this catalog. The most-starred ones next to it are Benchmark, Benchmark Optimization Loop and API Design Patterns. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of API Authentication Testing against them. Open each page to compare what they document and how they install.