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api-security-testing

api-security-testing is a skill for Claude Code, Codex from sickn33/agentic-awesome-skills. It costs 30 tokens per session (957 once invoked), scanned A, original, MIT.

A workflow for testing the security of REST and GraphQL APIs. It covers authentication, which verifies identity, authorization, which controls access, rate limits, input checks, and related weaknesses.

In plain words
What is it for?
Use it to assess API keys, JWTs, OAuth2 flows, token expiry, refresh tokens, rate limiting, input validation, and endpoint access controls.
Why use it?
An API may accept invalid credentials, expose data to the wrong user, or handle abusive requests poorly. This workflow breaks security checks into discovery, authentication, authorization, and other testing stages.

Skill for Claude CodeCodex

Part of the agentic-awesome-skills plugin — 196 skills shipped together

not rated 46k +288 today A scan 30 tokens original MIT
View the source file sickn33/agentic-awesome-skills sickn33.github.io
About the project

AAS Core is a local control plane for coding agents that lets them search a large catalogue of skills, choose a stack, validate it, and create a reproducible plan. It is used to assemble and review agent workflows through its CLI, local MCP server, catalogue, plugins, and Workbench. The catalogue add-ons provide the skills, plugins, bundles, and workflows that AAS Core helps agents select and validate.

sickn33/agentic-awesome-skills · 45,983 stars · on GitHub · sickn33.github.io

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/sickn33/agentic-awesome-skills/api-security-testing
Any agent
npx skills add sickn33/agentic-awesome-skills --skill api-security-testing
Clone the repo
git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills

Made for: Claude Code, Codex.

Or install agentic-awesome-skills, the plugin that ships this one along with the rest of its 196 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for api-security-testing

README.md
[![agentmods](https://agentmods.dev/badge/skills/sickn33/agentic-awesome-skills/api-security-testing.svg)](https://agentmods.dev/skills/sickn33/agentic-awesome-skills/api-security-testing)
Your own site
<a href="https://agentmods.dev/skills/sickn33/agentic-awesome-skills/api-security-testing"><img src="https://agentmods.dev/badge/skills/sickn33/agentic-awesome-skills/api-security-testing.svg" alt="Measured on agentmods" height="20"></a>
Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 957 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00030 $0.00957
Opus 5 $0.00015 $0.00478
Sonnet 5 $0.00006 $0.00191
Haiku 4.5 $0.00003 $0.00096

Measured today against content hash 5eb0a027aa11, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

api-security-testing scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured today.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

8 near-identical copies found in the catalogue:

plugins/agentic-awesome-skills-claude/skills/api-security-testing/SKILL.md · 177 lines

How it starts

The opening of the file, as written. The whole thing — 177 lines — stays where its author put it; the contents beside it link to each section on GitHub.

API Security Testing Workflow

Overview

Specialized workflow for testing REST and GraphQL API security including authentication, authorization, rate limiting, input validation, and API-specific vulnerabilities.

When to Use This Workflow

Use this workflow when:

  • Testing REST API security
  • Assessing GraphQL endpoints
  • Validating API authentication
  • Testing API rate limiting
  • Bug bounty API testing

Workflow Phases

Phase 1: API Discovery

Skills to Invoke
  • api-fuzzing-bug-bounty - API fuzzing
  • scanning-tools - API scanning
Actions
  1. Enumerate endpoints
  2. Document API methods
  3. Identify parameters
  4. Map data flows
  5. Review documentation
Copy-Paste Prompts
Use @api-fuzzing-bug-bounty to discover API endpoints

Phase 2: Authentication Testing

Skills to Invoke
  • broken-authentication - Auth testing
  • api-security-best-practices - API auth
Actions
  1. Test API key validation
  2. Test JWT tokens
  3. Test OAuth2 flows
  4. Test token expiration
  5. Test refresh tokens
Copy-Paste Prompts
Use @broken-authentication to test API authentication

Phase 3: Authorization Testing

Skills to Invoke
  • idor-testing - IDOR testing
Actions
  1. Test object-level authorization
  2. Test function-level authorization
  3. Test role-based access
  4. Test privilege escalation
  5. Test multi-tenant isolation
Copy-Paste Prompts
Use @idor-testing to test API authorization

Phase 4: Input Validation

Skills to Invoke
  • api-fuzzing-bug-bounty - API fuzzing
  • sql-injection-testing - Injection testing
Actions
  1. Test parameter validation
  2. Test SQL injection
  3. Test NoSQL injection
  4. Test command injection
  5. Test XXE injection
Copy-Paste Prompts
Use @api-fuzzing-bug-bounty to fuzz API parameters

Phase 5: Rate Limiting

Skills to Invoke
  • api-security-best-practices - Rate limiting
Actions
  1. Test rate limit headers
  2. Test brute force protection
  3. Test resource exhaustion
  4. Test bypass techniques
  5. Document limitations

Read the full file on GitHub · 177 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. today First seen · 177 lines · 30 tokens per session scan A 5eb0a027aa11

Subscribe to this mod's changes

api-security-testing is a skill published in the GitHub repository sickn33/agentic-awesome-skills (45,983 stars, last pushed today), licensed MIT. It adds 30 tokens to every session and 957 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-05.

Backend and APIsSecurityagentic-skillsai-agentsai-workflowsantigravityclaude-codegranular-workflow-bundlemcp
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