api-security
API security testing - GraphQL, REST API, WebSocket, and Web-LLM attack techniques.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/transilienceai/communitytools --skill api-security- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads api-security automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
API Security
Test API endpoints for security vulnerabilities across REST, GraphQL, WebSocket, and LLM-integrated APIs.
Techniques
| Type | Key Vectors |
|---|---|
| GraphQL | Introspection, batching attacks, nested query DoS, field suggestion |
| REST API | BOLA/IDOR, mass assignment, rate limiting, auth bypass, versioning |
| WebSocket | Cross-site hijacking, message manipulation, auth flaws |
| Web-LLM | Prompt injection via API, excessive agency, data exfiltration |
Workflow
- Discover API endpoints and documentation (Swagger, GraphQL schema)
- Map authentication and authorization mechanisms
- Test per API type using appropriate techniques
- Validate data exposure and access control flaws
- Capture evidence with HTTP request/response logs
API at scale (offline corpus / fixture-driven)
For a large or offline API surface — a 2000+ path Swagger, a Postman corpus, a HAR capture — do NOT hand-build the coverage machinery per engagement. Drive it deterministically:
- Ingest the corpus → per-endpoint fixtures:
python3 tools/fixture_ingest.py <openapi|postman|har> -o fixtures.jsonnormalizes every operation into a request template (method, url with path params filled, sampled body,object_reffor id-like path params, security requirement) and STRIPS baked-in auth (the harness injects tokens). This is what turns a large (thousands-of-operations) OpenAPI/Postman corpus into a resumable matrix instead of an untested pile. - Acquire per-role sessions: via
authenticated-session-acquisition(MFA/OTP/SRP → reusable tokens) into the harness's token store. - Replay the per-role authz matrix:
python3 tools/auth_replay_harness.py --requests fixtures.json --tokens tokens.json [--proxy <vantage>]replays every endpoint under every role (and cross-tenant), flags BOLA/BFLA where a role gotauthorizedon an object/action it should not, and logs anevidence_idper (endpoint × role). Egress-route via the provisioned vantage for allowlisted APIs. - Protocol-specific authz: OData (
odata-deep-authz.md), Cognito (cognito-unauth-and-srp.md), authenticated WebSocket (authenticated-per-role-authz.md).
The batch is resumable (checkpoint the harness results) so flapping auth never zeroes the run — the recurring at-scale gap. Run the FULL matrix so a clean result is an evidenced negative, not an untested surface.
Reference
reference/graphql*.md- GraphQL attack techniques and labsreference/scenarios/rest/*.md- REST API security testing (BOLA/BOPLA, mass assignment, SSPP, content-type confusion)scenarios/rest/odata-deep-authz.md- OData$metadataenum +$filter/$orderby/$expandcross-tenant BOLA & injectionscenarios/rest/cognito-unauth-and-srp.md- Cognito UNSIGNED unauthenticated posture (self-signup/enumeration) + SRP authenticated session
reference/websockets*.md- WebSocket vulnerability testingscenarios/websocket/authenticated-per-role-authz.md- authenticated per-role relay: BOLA/BFLA/channel-authz over the socket
reference/web-llm*.md- Web-LLM attack techniques and labs
FAQ
What does the api-security skill do?
API security testing - GraphQL, REST API, WebSocket, and Web-LLM attack techniques.
How do I install api-security?
Run npx skills add https://github.com/transilienceai/communitytools --skill api-security in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/api-security/ (personal) or .claude/skills/api-security/ (project).
Which AI agents can use api-security?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is api-security safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains api-security?
It is published by transilienceai in transilienceai/communitytools. It has 206 recorded installs.
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