API Fuzzing with RESTler

API Fuzzing with RESTler is a Quality skill for Claude Code, published by xalgord in xalgorix.

852 stars151 forkson xalgord/xalgorixAdded 2026/07/20+1% in starsRepository updated 2026/08/04

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

Install in seconds

Install API Fuzzing with RESTler

Copy API Fuzzing with RESTler 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/performing-api-fuzzing-with-restler ~/.claude/skills/performing-api-fuzzing-with-restler

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/performing-api-fuzzing-with-restler/SKILL.md in xalgord/xalgorix
Installs to: ~/.claude/skills/performing-api-fuzzing-with-restler
Collection: One of 51 skills cataloged from this repository
Category: Quality — 1897 skills

What API Fuzzing with RESTler does

Uses Microsoft RESTler to perform stateful REST API fuzzing by automatically generating and executing test sequences.

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

Documentation

README

Excerpt

Performing API Fuzzing with RESTler

When to Use

Performing automated security testing of REST APIs using their OpenAPI/Swagger specifications
Discovering bugs that only manifest through specific sequences of API calls (stateful testing)
Finding 500 Internal Server Error responses that indicate unhandled exceptions or crash conditions
Testing API input validation by fuzzing parameters with malformed, boundary, and injection payloads
Running continuous security regression testing in CI/CD pipelines for API changes

Do not use against production environments without explicit authorization and monitoring. RESTler creates and deletes resources aggressively during fuzzing.

Most Often Missed & How to Confirm

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

Commands API Fuzzing with RESTler provides

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

/users
/orders

Frequently asked about API Fuzzing with RESTler

What else does xalgord publish alongside API Fuzzing with RESTler?
API Fuzzing with RESTler 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 Fuzzing with RESTler 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 Fuzzing with RESTler compare to other Quality skills?
API Fuzzing with RESTler ranks #936 by stars among the 1897 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 Fuzzing with RESTler against them. Open each page to compare what they document and how they install.