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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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1 changed files with 1734 additions and 3 deletions
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17
src/ModelContextProtocol.Core/Server/McpServerResourceCreateOptions.cs
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@ -2,6 +2,7 @@ using Microsoft.Extensions.AI;
using ModelContextProtocol.Protocol;
using System.ComponentModel;
using System.Text.Json;
using System.Text.Json.Nodes;
namespace ModelContextProtocol.Server;
@ -101,6 +102,21 @@ public sealed class McpServerResourceCreateOptions
/// </remarks>
public IList<Icon>? Icons { get; set; }
/// <summary>
/// Gets or sets metadata reserved by MCP for protocol-level metadata.
/// </summary>
/// <remarks>
/// <para>
/// This <see cref="JsonObject"/> is used to seed the <see cref="Resource.Meta"/> property. Any metadata from
/// <see cref="McpMetaAttribute"/> instances on the method will be added to this object, but
/// properties already present in this <see cref="JsonObject"/> will not be overwritten.
/// </para>
/// <para>
/// Implementations must not make assumptions about its contents.
/// </para>
/// </remarks>
public JsonObject? Meta { get; set; }
/// <summary>
/// Creates a shallow clone of the current <see cref="McpServerResourceCreateOptions"/> instance.
/// </summary>
@ -117,5 +133,6 @@ public sealed class McpServerResourceCreateOptions
SchemaCreateOptions = SchemaCreateOptions,
Metadata = Metadata,
Icons = Icons,
Meta = Meta,
};
}