graphql-and-hidden-parameters
GraphQL and hidden parameter testing playbook. Use when exploring introspection, batching, undocumented fields, hidden parameters, schema abuse, and GraphQL authorization gaps.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/yaklang/hack-skills --skill graphql-and-hidden-parameters- 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 graphql-and-hidden-parameters 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.
SKILL: GraphQL and Hidden Parameters — Introspection, Batching, and Undocumented Fields
AI LOAD INSTRUCTION: Use this skill when GraphQL exists or when REST documentation suggests optional, deprecated, or undocumented fields. Focus on schema discovery, hidden parameter abuse, and batching as a force multiplier.
1. GRAPHQL FIRST PASS
query { __typename }
query {
__schema {
types { name }
}
}
If introspection is restricted, continue with:
- field suggestions and error-based discovery
- known type probes like
__type(name: "User") - JS and mobile bundle route extraction
2. HIGH-VALUE GRAPHQL TESTS
| Theme | Example |
|---|---|
| IDOR | user(id: "victim") |
| batching | array of login or object fetch operations |
| hidden fields | admin-only fields exposed in type definitions |
| nested authz gaps | related object fields with weaker checks |
3. HIDDEN PARAMETER DISCOVERY
Look for:
- fields present in admin docs but not public docs
additionalPropertiesor permissive schemas- frontend code using richer request bodies than visible UI controls
- mobile endpoints carrying role, org, feature-flag, or internal filter fields
4. NEXT ROUTING
- If hidden fields affect privilege: api authorization and bola
- If GraphQL batching changes auth or rate behavior: api auth and jwt abuse
- If endpoint discovery is incomplete: api recon and docs
FAQ
What does the graphql-and-hidden-parameters skill do?
GraphQL and hidden parameter testing playbook. Use when exploring introspection, batching, undocumented fields, hidden parameters, schema abuse, and GraphQL authorization gaps.
How do I install graphql-and-hidden-parameters?
Run npx skills add https://github.com/yaklang/hack-skills --skill graphql-and-hidden-parameters 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/graphql-and-hidden-parameters/ (personal) or .claude/skills/graphql-and-hidden-parameters/ (project).
Which AI agents can use graphql-and-hidden-parameters?
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 graphql-and-hidden-parameters 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 graphql-and-hidden-parameters?
It is published by yaklang in yaklang/hack-skills. It has 3,658 recorded installs.
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