intent-solutions-io/fuzzing-apis
010-archive/backups-20251108/skill-structure-cleanup-20251108-073936/plugins/testing/api-fuzzer/skills/api-fuzzer/SKILL.md
This skill enables Claude to perform automated fuzz testing on APIs to discover vulnerabilities, crashes, and unexpected behavior. It leverages malformed inputs, boundary values, and random payloads to generate comprehensive fuzz test suites. Use this skill when you need to identify potential SQL injection, XSS, command injection vulnerabilities, input validation failures, and edge cases in APIs. Trigger this skill by requesting fuzz testing, vulnerability scanning, or security analysis of an API. The skill is invoked using the `/fuzz-api` command.
$ install --global
skillsauthnpx skillsauth add intent-solutions-io/plugins-nixtla fuzzing-apisInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Jun 5, 2026, 7:06 AM17.4s4 files scanned
SKILL.md
- name:
- fuzzing-apis
- description:
- |
- allowed-tools:
- Read, Write, Edit, Grep, Glob, Bash
- version:
- 1.0.0
Overview
This skill allows Claude to conduct automated fuzz testing on REST APIs. It identifies potential security flaws and robustness issues by injecting various malformed inputs, boundary values, and random data.
How It Works
- Input Generation: The skill generates a diverse set of test inputs, including malformed data, boundary values, and random payloads.
- API Interaction: It sends these inputs to the specified API endpoints.
- Result Analysis: It analyzes the API's responses and behavior to identify vulnerabilities, crashes, and unexpected results, such as SQL injection errors or XSS vulnerabilities.
When to Use This Skill
This skill activates when you need to:
- Identify potential security vulnerabilities in an API.
- Test the robustness of an API against unexpected inputs.
- Ensure proper input validation is implemented in an API.
Examples
Example 1: Discovering SQL Injection Vulnerability
User request: "Fuzz test the /users endpoint for SQL injection vulnerabilities."
The skill will:
- Generate SQL injection payloads.
- Send these payloads to the /users endpoint.
- Analyze the API's responses for SQL errors or unexpected behavior indicating a SQL injection vulnerability.
Example 2: Testing Input Validation
User request: "Fuzz test the /products endpoint to check for input validation issues with price and quantity parameters."
The skill will:
- Generate malformed inputs for price and quantity (e.g., negative values, extremely large numbers, non-numeric characters).
- Send these inputs to the /products endpoint.
- Analyze the API's responses for errors or unexpected behavior, indicating input validation failures.
Best Practices
- Specificity: Be specific about the API endpoint or parameters you want to fuzz.
- Context: Provide context about the expected behavior of the API.
- Iteration: Run multiple fuzzing sessions with different input sets for thorough testing.
Integration
This skill can be used in conjunction with other security analysis tools to provide a more comprehensive assessment of an API's security posture. It can also be integrated into a CI/CD pipeline to automate security testing.
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