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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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4
samples/AspNetCoreMcpServer/Tools/WeatherTools.cs
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@ -17,6 +17,8 @@ public sealed class WeatherTools
}
[McpServerTool, Description("Get weather alerts for a US state.")]
[McpMeta("category", "weather")]
[McpMeta("dataSource", "weather.gov")]
public async Task<string> GetAlerts(
[Description("The US state to get alerts for. Use the 2 letter abbreviation for the state (e.g. NY).")] string state)
{
@ -46,6 +48,8 @@ public sealed class WeatherTools
}
[McpServerTool, Description("Get weather forecast for a location.")]
[McpMeta("category", "weather")]
[McpMeta("recommendedModel", "gpt-4")]
public async Task<string> GetForecast(
[Description("Latitude of the location.")] double latitude,
[Description("Longitude of the location.")] double longitude)