# JSON Schema Compatibility Evidence

Build-time release reference. Runtime readiness, deployment, payment settlement and external indexing are not evaluated here. Prices are proposed; this file cannot authorize execution or payment.

Conservatively test whether all values accepted by a previous typed JSON Schema subset remain accepted by a next schema. Returns compatible only after a structural inclusion proof, incompatible only with a verified counterexample, otherwise unknown. Supports explicit single types, object/array constraints, enum/const and inclusive bounds; no refs/combinators/regex.

Release: 0.29.0. Built: 2026-10-06T15:38:00Z.

## Choose for
- Gate an agent tool input-schema upgrade for backward acceptance
- Get concrete evidence for a breaking schema change

## Outside this profile
- General JSON Schema subsumption
- Deciding behavior compatibility or security from schemas alone

Proposed nominal USD 0.01 per successful call; payer fees excluded. No verified runtime availability.

- [Exact release contract](/reference/services/json-schema-compatibility.json)
- [Input schema](/reference/schemas/json-schema-compatibility.input.json)
- [Output schema](/reference/schemas/json-schema-compatibility.output.json)
- [Fixed example](/reference/examples/json-schema-compatibility.json)
- [Complete HTML reference](/discover/tools/json-schema-compatibility)