modelcontextprotocol/typescript-sdk
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typescript-sdk/.changeset/spec-type-schema.md

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@modelcontextprotocol/client @modelcontextprotocol/server
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Export isSpecType and specTypeSchemas records for runtime validation of any MCP spec type by name. isSpecType.ContentBlock(value) is a type predicate; specTypeSchemas.ContentBlock is a StandardSchemaV1Sync<ContentBlock> validator — validate() returns the result synchronously. Guards are standalone functions, so arr.filter(isSpecType.ContentBlock) works. Also export the SpecTypeName, SpecTypes, and StandardSchemaV1Sync types.