API Fuzzing for Bug Bounty Agent Skill

This skill should be used when the user asks to "test API security", "fuzz APIs", "find IDOR vulnerabilities", "test REST API", "test GraphQL", "API penetration testing", "bug bounty API testing", or needs guidance on API security assessment techniques.

3k tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

505

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/Dokhacgiakhoa/Agent-Skills-4-Vibe-Coding-CLI --skill API Fuzzing for Bug Bounty

What comes with it

8 888 bytes besides the instruction

sub-skills/dos-via-limits.md

sub-skills/example-1-idor-exploitation.md

sub-skills/example-2-graphql-introspection.md

sub-skills/graphql-dos-nested-queries.md

sub-skills/graphql-idor.md

sub-skills/graphql-sqlnosql-injection.md

sub-skills/graphql-tools.md

sub-skills/graphql-xss.md

sub-skills/introspection-query.md

sub-skills/pdf-export-attacks.md

sub-skills/rate-limit-bypass-batching.md

sub-skills/step-1-api-reconnaissance.md

sub-skills/step-2-authentication-testing.md

sub-skills/step-3-idor-testing.md

sub-skills/step-4-injection-testing.md

sub-skills/step-5-method-testing.md

The instruction itself

23 sections, as written by the author

API Fuzzing for Bug Bounty

Purpose

Provide comprehensive techniques for testing REST, SOAP, and GraphQL APIs during bug bounty hunting and penetration testing engagements. Covers vulnerability discovery, authentication bypass, IDOR exploitation, and API-specific attack vectors.

Inputs/Prerequisites

Burp Suite or similar proxy tool
API wordlists (SecLists, api_wordlist)
Understanding of REST/GraphQL/SOAP protocols
Python for scripting
Target API endpoints and documentation (if available)

Outputs/Deliverables

Identified API vulnerabilities
IDOR exploitation proofs
Authentication bypass techniques
SQL injection points
Unauthorized data access documentation

API Types Overview

|------|----------|-------------|-----------|

Core Workflow

🧠 Knowledge Modules (Fractal Skills)

1. Step 1: API Reconnaissance

2. Step 2: Authentication Testing

3. Step 3: IDOR Testing

4. Step 4: Injection Testing

5. Step 5: Method Testing

6. Introspection Query

7. GraphQL IDOR

8. GraphQL SQL/NoSQL Injection

9. Rate Limit Bypass (Batching)

10. GraphQL DoS (Nested Queries)

11. GraphQL XSS

12. GraphQL Tools

13. PDF Export Attacks

14. DoS via Limits

15. Example 1: IDOR Exploitation

16. Example 2: GraphQL Introspection

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How to use it

Copy the folder

Take dokhacgiakhoa/api fuzzing for bug bounty from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.