feat: Adds _meta to additional interface types.#710
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dsp-ant merged 2 commits intomodelcontextprotocol:mainmodelcontextprotocol/modelcontextprotocol:mainfrom Jun 13, 2025
mbleigh:meta-on-resourcesmbleigh/modelcontextprotocol:meta-on-resourcesCopy head branch name to clipboard
Merged
feat: Adds _meta to additional interface types.#710dsp-ant merged 2 commits intomodelcontextprotocol:mainmodelcontextprotocol/modelcontextprotocol:mainfrom mbleigh:meta-on-resourcesmbleigh/modelcontextprotocol:meta-on-resourcesCopy head branch name to clipboard
dsp-ant merged 2 commits intomodelcontextprotocol:mainmodelcontextprotocol/modelcontextprotocol:mainfrom
mbleigh:meta-on-resourcesmbleigh/modelcontextprotocol:meta-on-resourcesCopy head branch name to clipboard
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mbleigh
commented
Jun 11, 2025
| * 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
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Jun 13, 2025
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Thank you. I'll accept as is but will add a PR to change the wording of the description to ensure people understand _meta is always reserved by the protocol.
| 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.
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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