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

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* Initial plan

* Add McpMetaAttribute and integrate with tools, prompts, and resources

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

* Add tests and sample usage for McpMetaAttribute

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

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

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

* Fix missing using directives and clarify McpMetaAttribute documentation

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

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

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

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

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

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

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

* Simplify MethodInfo resolution to use function.UnderlyingMethod directly

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

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

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

* Fix remaining issues

* Revert to string-based JSON values for McpMetaAttribute with StringSyntax annotation

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

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

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

* Fix tests and a bit of cleanup

* Change approach and add lots of tests

* Use JsonContext for serialization and fix floating point test comparison

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Co-authored-by: Stephen Toub <stoub@microsoft.com>
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Copilot 2025-10-17 09:02:54 -04:00 • committed by GitHub
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src/ModelContextProtocol.Core/Protocol/ClientCapabilities.cs
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@ -47,7 +47,7 @@ public sealed class ClientCapabilities
/// </para>
/// <para>
/// The server can use <see cref="McpServer.RequestRootsAsync"/> to request the list of
/// available roots from the client, which will trigger the client's <see cref="ModelContextProtocol.Client.McpClientHandlers.RootsHandler"/>.
/// available roots from the client, which will trigger the client's <see cref="McpClientHandlers.RootsHandler"/>.
/// </para>
/// </remarks>
[JsonPropertyName("roots")]