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MCP Error: Invalid outputSchema, JSON Schema Declares an Unsupported Dialect


Elena Daehnhardt ·

Every tool from every server built on the MCP TypeScript SDK gets rejected the moment it declares an outputSchema, because the SDK still emits JSON Schema draft-07 and strict clients only accept 2020-12. Here is the exact error, why it happens, and two workarounds I tested against SDK 1.30.1. Read more...

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