Add conformance tests for SEP-1613 JSON Schema 2020-12 support #45
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Add conformance test to validate that MCP servers correctly preserve JSON Schema 2020-12 keywords ($schema, $defs, additionalProperties) in tool definitions. Changes: - Add JsonSchema2020_12Scenario in src/scenarios/server/json-schema-2020-12.ts - Add json_schema_2020_12_tool to everything-server with tools/list override to return raw JSON Schema instead of Zod-converted schema - Register scenario in pendingClientScenariosList (requires SDK PR #1135) The test is added to pending because the client SDK currently strips the JSON Schema 2020-12 keywords. Once PR #1135 is merged into the SDK, this scenario can be moved to the active list.
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pcarleton
approved these changes
Nov 20, 2025
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Adds conformance tests for SEP-1613 which establishes JSON Schema 2020-12 as the default dialect for MCP tool schemas.
Summary
$schemafield preservation with valuehttps://json-schema.org/draft/2020-12/schema$defsfield preservation with expected structureadditionalPropertiesfield preservationjson_schema_2020_12_toolto everything-server with custom tools/list handlerMotivation and Context
SEP-1613 establishes JSON Schema 2020-12 as the default dialect for MCP. These conformance tests ensure SDK implementations correctly preserve JSON Schema 2020-12 keywords (
$schema,$defs,additionalProperties) in tool definitions, rather than stripping them during schema conversion.How Has This Been Tested?
Breaking Changes
None.
Types of changes
Checklist
Note
This PR requires SDK with PR #1135 merged to fully pass. The scenario is currently in
pendingClientScenariosListuntil the SDK preserves JSON Schema 2020-12 keywords.