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Add structured output/output schema support for server-side tools. (#480)

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* Add structured output/output schema support for server-side tools.

* Address feedback.

* Add McpServerToolAttribute.UseStructuredContent

---------

Co-authored-by: Stephen Toub <stoub@microsoft.com>
This commit is contained in:
Eirik Tsarpalis 2025-06-06 08:20:12 +01:00 • committed by GitHub
commit fa017c04c3
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1 changed files with 310 additions and 20 deletions
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13
src/ModelContextProtocol.Core/Server/McpServerToolCreateOptions.cs
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@ -1,4 +1,5 @@
using Microsoft.Extensions.AI;
using ModelContextProtocol.Protocol;
using System.ComponentModel;
using System.Text.Json;
@ -24,7 +25,7 @@ public sealed class McpServerToolCreateOptions
/// Gets or sets optional services used in the construction of the <see cref="McpServerTool"/>.
/// </summary>
/// <remarks>
/// These services will be used to determine which parameters should be satisifed from dependency injection. As such,
/// These services will be used to determine which parameters should be satisfied from dependency injection. As such,
/// what services are satisfied via this provider should match what's satisfied via the provider passed in at invocation time.
/// </remarks>
public IServiceProvider? Services { get; set; }
@ -124,6 +125,15 @@ public sealed class McpServerToolCreateOptions
/// </remarks>
public bool? ReadOnly { get; set; }
/// <summary>
/// Gets or sets whether the tool should report an output schema for structured content.
/// </summary>
/// <remarks>
/// When enabled, the tool will attempt to populate the <see cref="Tool.OutputSchema"/>
/// and provide structured content in the <see cref="CallToolResponse.StructuredContent"/> property.
/// </remarks>
public bool UseStructuredContent { get; set; }
/// <summary>
/// Gets or sets the JSON serializer options to use when marshalling data to/from JSON.
/// </summary>
@ -154,6 +164,7 @@ public sealed class McpServerToolCreateOptions
Idempotent = Idempotent,
OpenWorld = OpenWorld,
ReadOnly = ReadOnly,
UseStructuredContent = UseStructuredContent,
SerializerOptions = SerializerOptions,
SchemaCreateOptions = SchemaCreateOptions,
};