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api-security-testing

api-security-testing is a skill for Claude Code, Codex from marysatasselshaped667/skills-collection-1. It costs 30 tokens per session (897 once invoked), scanned A, a copy of api-security-testing, MIT.

A step-by-step process for checking the security of REST and GraphQL APIs, including their login systems, permissions, request limits, input handling, and API-specific weaknesses.

In plain words
What is it for?
Use it for API security reviews, bug-bounty testing, and checking API keys, JWTs, OAuth2 flows, token expiry, refresh tokens, rate limits, and input validation.
Why use it?
It organizes security work into discovery, authentication checks, authorization checks, and later testing steps so important areas are less likely to be missed.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 1repo yesterday A scan 30 tokens copy · 91% MIT

Good fit Use it for API security reviews, bug-bounty testing, and checking API keys, JWTs, OAuth2 flows, token expiry, refresh tokens, rate limits, and input validation.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/marysatasselshaped667/skills-collection-1/api-security-testing
View source ↗ marysatasselshaped667/skills-collection-1
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.

Any agent
npx skills add marysatasselshaped667/skills-collection-1 --skill api-security-testing
Clone the repo
git clone --depth 1 https://github.com/marysatasselshaped667/skills-collection-1

Made for: Claude Code, Codex.

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/marysatasselshaped667/skills-collection-1/api-security-testing/github.svg)](https://agentmods.dev/skills/marysatasselshaped667/skills-collection-1/api-security-testing)
Your own site
<a href="https://agentmods.dev/skills/marysatasselshaped667/skills-collection-1/api-security-testing"><img src="https://agentmods.dev/badge/skills/marysatasselshaped667/skills-collection-1/api-security-testing/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for api-security-testing

Your own site · 80×15
<a href="https://agentmods.dev/skills/marysatasselshaped667/skills-collection-1/api-security-testing"><img src="https://agentmods.dev/badge/skills/marysatasselshaped667/skills-collection-1/api-security-testing.svg" alt="Reviewed on agentmods" width="80" 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 897 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 91% copy Near-identical to another mod 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 $0.00897
Opus 5 $0.00015 $0.00449
Sonnet 5 $0.00006 $0.00179
Haiku 4.5 $0.00003 $0.00090

Measured 6d ago against content hash 266ed413c7cf, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, 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 6d ago.

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

This is a copy

91% identical to api-security-testing — 5 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

SKILLS/api-security-testing/SKILL.md · 172 lines

How it starts

The opening of the file, as written. The whole thing — 172 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 · 172 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. 6d ago First seen · 172 lines · 30 tokens per session scan A 266ed413c7cf

Subscribe to this mod's changes

api-security-testing is a skill published in the GitHub repository marysatasselshaped667/skills-collection-1 (1 stars, last pushed yesterday), licensed MIT. It adds 30 tokens to every session and 897 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 91% identical to api-security-testing, differing in 5 lines, and is treated as a copy.

DebuggingSecurityagentsaiai-codingai-workflowsantigravityantigravity-skillsgranular-workflow-bundle
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