feat: Adds _meta to additional interface types. #710
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mbleigh
commented
Jun 11, 2025
| @@ -30,6 +30,7 @@ export interface Request { | |||
| * If specified, the caller is requesting out-of-band progress notifications for this request (as represented by notifications/progress). The value of this parameter is an opaque token that will be attached to any subsequent notifications. The receiver is not obligated to provide these notifications. | |||
| */ | |||
| progressToken?: ProgressToken; | |||
| [key: string]: unknown; | |||
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It seems like this was likely a mistake/omission -- presumably request metadata is intended to allow additional keys and not just progressToken, right?
dsp-ant
approved these changes
Jun 13, 2025
| @@ -472,6 +473,11 @@ export interface Resource { | |||
| * This can be used by Hosts to display file sizes and estimate context window usage. | |||
| */ | |||
| size?: number; | |||
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| /** | |||
| * Reserved field for additional metadata. | |||
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Notable that this is "reserved by MCP for additional metadata", as the other fields.
This was referenced Jun 13, 2025
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This adds
_metaon additional resource types throughout the specification, specifically those that appear as arrays in list results or multi-part content.Motivation and Context
See discussion for motivation.
How Has This Been Tested?
Since this change merely adds additional optional inert metadata, it should be a safe non-breaking change for all existing clients and servers.
Breaking Changes
NONE
Types of changes
Checklist