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fix: add missing size field to ResourceSchema (#1574)

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Co-authored-by: Ola Hungerford <olaservo@users.noreply.github.com>
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Ola Hungerford 2026-03-26 09:08:59 -07:00 • committed by GitHub
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5
.changeset/add-resource-size-field.md Normal file
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@ -0,0 +1,5 @@
---
'@modelcontextprotocol/core': patch
---
Add missing `size` field to `ResourceSchema` to match the MCP specification

7
packages/core/src/types/schemas.ts
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@ -832,6 +832,13 @@ 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.
*/