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.
npx agentmods add skills/miru-zero/zero-brain/graphql-and-hidden-parametersnpx skills add miru-zero/zero-brain --skill graphql-and-hidden-parametersgit clone --depth 1 https://github.com/miru-zero/zero-brainWrote 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.
[](https://agentmods.dev/skills/miru-zero/zero-brain/graphql-and-hidden-parameters)<a href="https://agentmods.dev/skills/miru-zero/zero-brain/graphql-and-hidden-parameters"><img src="https://agentmods.dev/badge/skills/miru-zero/zero-brain/graphql-and-hidden-parameters.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00038 | $0.00430 |
| Opus 5 | $0.00019 | $0.00215 |
| Sonnet 5 | $0.00008 | $0.00086 |
| Haiku 4.5 | $0.00004 | $0.00043 |
Grade A, and why
graphql-and-hidden-parameters 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 5d 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.
This is a copy
92% identical to graphql-and-hidden-parameters — 4 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.
What it actually says
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
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.
- 5d ago First seen · 50 lines · 38 tokens per session scan A 1c44c468323f
graphql-and-hidden-parameters is a skill published in the GitHub repository miru-zero/zero-brain (0 stars, last pushed 18d ago), licensed MIT. It adds 38 tokens to every session and 430 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 92% identical to graphql-and-hidden-parameters, differing in 4 lines, and is treated as a copy.
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