fix: add missing size field to ResourceSchema per MCP spec#1600
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giulio-leone wants to merge 3 commits intomodelcontextprotocol:v1.xfrom
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fix: add missing size field to ResourceSchema per MCP spec#1600giulio-leone wants to merge 3 commits intomodelcontextprotocol:v1.xfrom
giulio-leone wants to merge 3 commits intomodelcontextprotocol:v1.xfrom
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February 28, 2026 15:50
The MCP specification (revisions 2025-06-18, 2025-11-25, and draft) defines an optional `size?: number` field on the Resource interface for declaring raw resource content size in bytes. This field was missing from the TypeScript SDK's ResourceSchema Zod definition. Fixes modelcontextprotocol#1573
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Summary
The MCP specification (revisions 2025-06-18, 2025-11-25, and draft) defines an optional
size?: numberfield on theResourceinterface:This field is missing from the TypeScript SDK's
ResourceSchemaZod definition.Fix
Added
size: z.optional(z.number())toResourceSchemainsrc/types.ts.Since
ResourceMetadatais derived asOmit<Resource, 'uri' | 'name'>, servers can immediately passsizein resource metadata and it will be included inresources/listresponses.Test
Added 1 test verifying that a resource registered with
size: 102400correctly returns the size field in theresources/listresponse.Verification
2 consecutive clean test runs: 1549/1549 tests passed, 0 failures.
Fixes #1573