Add McpMetaAttribute for attaching metadata to tools, prompts, and resources#857

Merged

stephentoub merged 16 commits intomainfrom

copilot/add-metadata-to-prompts

Oct 17, 2025

Commits on Oct 16, 2025

Initial plan

Copilot
authored and
stephentoub
committed
Add McpMetaAttribute and integrate with tools, prompts, and resources

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Add tests and sample usage for McpMetaAttribute

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Add Meta property to options classes and update logic to merge with attributes

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Fix missing using directives and clarify McpMetaAttribute documentation

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Make Name and Value constructor parameters in McpMetaAttribute and check AIFunction.Metadata.UnderlyingMethod

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Change Value type to object and use JsonSerializer.SerializeToNode, fix nullable warnings

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Fix UnderlyingMethod property path, use SerializerOptions, and fix JsonObject cref

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Simplify MethodInfo resolution to use function.UnderlyingMethod directly

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Fix IL2026 trimming warning by providing type info to JsonSerializer.SerializeToNode

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Fix remaining issues
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Revert to string-based JSON values for McpMetaAttribute with StringSyntax annotation

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Add StringSyntax attribute to Value property and fix sample code to use escaped quotes

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Fix tests and a bit of cleanup
stephentoub
committed

Commits on Oct 17, 2025