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typescript-sdk/.changeset/zod-jsonschema-fallback.md
Felix Weinberger b256546750
 fix(core): fall back to z.toJSONSchema for zod schemas without ~standard.jsonSchema (#1895) 
Co-authored-by: Konstantin Konstantinov <KKonstantinov@users.noreply.github.com>
2026-04-28 12:37:08 +00:00

744 B
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@modelcontextprotocol/core @modelcontextprotocol/server @modelcontextprotocol/client
patch patch patch

Fix runtime crash on tools/list when a tool's inputSchema comes from zod 4.0–4.1. The SDK requires ~standard.jsonSchema (StandardJSONSchemaV1, added in zod 4.2.0); previously a missing jsonSchema crashed at undefined[io]. standardSchemaToJsonSchema now detects zod 4 schemas lacking jsonSchema and falls back to the SDK-bundled z.toJSONSchema(), emitting a one-time console warning. zod 3 schemas (which the bundled zod 4 converter cannot introspect) and non-zod schema libraries without jsonSchema get a clear error pointing to fromJsonSchema(). The workspace zod catalog is also bumped to ^4.2.0.