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[v1.x] fix: add missing size field to ResourceSchema #1575

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[v1.x] fix: add missing size field to ResourceSchema #1575

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5 changes: 5 additions & 0 deletions .changeset/add-resource-size-field.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'@modelcontextprotocol/sdk': patch
---

Add missing `size` field to `ResourceSchema` to match the MCP specification
7 changes: 7 additions & 0 deletions src/types.ts
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Expand Up @@ -901,6 +901,13 @@ export const ResourceSchema = z.object({
*/
mimeType: z.optional(z.string()),

/**
* The size of the raw resource content, in bytes (i.e., before base64 encoding or any tokenization), if known.
*
* This can be used by Hosts to display file sizes and estimate context window usage.
*/
size: z.optional(z.number()),

/**
* Optional annotations for the client.
*/
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