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Support specifying OutputSchema independently of return type for tools returning CallToolResult (#1425)

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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>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Copilot 2026-03-22 21:19:29 -04:00 • committed by GitHub
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21
src/ModelContextProtocol.Core/Server/McpServerToolCreateOptions.cs
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@ -129,6 +129,26 @@ public sealed class McpServerToolCreateOptions
/// </remarks>
public bool UseStructuredContent { get; set; }
/// <summary>
/// Gets or sets an explicit JSON schema to use as the tool's output schema.
/// </summary>
/// <value>
/// The default is <see langword="null"/>, which means the output schema is inferred from the return type.
/// </value>
/// <remarks>
/// <para>
/// When set, this schema is used as the <see cref="Tool.OutputSchema"/> instead of the schema
/// inferred from the tool method's return type. This is particularly useful when a tool method
/// returns <see cref="CallToolResult"/> directly (to control properties like <see cref="Result.Meta"/>,
/// <see cref="CallToolResult.IsError"/>, or <see cref="CallToolResult.StructuredContent"/>) but still
/// needs to advertise a meaningful output schema to clients.
/// </para>
/// <para>
/// <see cref="UseStructuredContent"/> must also be set to <see langword="true"/> for this property to take effect.
/// </para>
/// </remarks>
public JsonElement? OutputSchema { get; set; }
/// <summary>
/// Gets or sets the JSON serializer options to use when marshalling data to/from JSON.
/// </summary>
@ -209,6 +229,7 @@ public sealed class McpServerToolCreateOptions
OpenWorld = OpenWorld,
ReadOnly = ReadOnly,
UseStructuredContent = UseStructuredContent,
OutputSchema = OutputSchema,
SerializerOptions = SerializerOptions,
SchemaCreateOptions = SchemaCreateOptions,
Metadata = Metadata,