ModelRefs / GraphQL Tool — Tool Pattern
GraphQL Tool — Tool Pattern
Expose a typed query/mutation surface so the model can request exactly the fields it needs from a GraphQL endpoint.
Overview
Wrap a GraphQL endpoint behind a tool that accepts a query, validates it against the introspected schema, and executes with persisted-query allowlists for safety.
When to use it: You need the model to fetch precisely-shaped data from a GraphQL backend.
Pattern details
| Pattern class | api |
|---|---|
| Difficulty | advanced |
| Invocation mode | synchronous |
| Also known as | gql tool |
| Last reviewed | 2026-06-07 |
Known failure modes
- Over-fetching — Model requests excessively deep query. Mitigation: Depth limit + cost analysis.
- Introspection leak — Schema leaked in production responses. Mitigation: Disable introspection in prod; use persisted queries.
When not to use it
- Letting the model send arbitrary mutations in production.
Continue your research
Use these connected ModelRefs sections to compare alternatives, inspect implementation paths, and review the evidence and governance boundaries relevant to GraphQL Tool — Tool Pattern.
Frequently asked questions
When should I use the GraphQL Tool tool pattern?
You need the model to fetch precisely-shaped data from a GraphQL backend.
What are common failure modes of GraphQL Tool?
Over-fetching • Introspection leak
Is GraphQL Tool production-ready?
Yes when paired with the safety controls and observability hooks documented on the pattern page.