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Merge remote-tracking branch 'origin/main' into mbuck/api-experiments
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‎.github/workflows/ci-build-test.yml

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if: runner.os == 'Linux'
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run: sudo apt-get install -y mono-devel
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- name: Setup Mono on macOS
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if: runner.os == 'macOS'
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run: brew install mono
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- name: Set up Node.js
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uses: actions/setup-node@cdca7365b2dadb8aad0a33bc7601856ffabcc48e # v4.3.0
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with:

‎.github/workflows/markdown-link-check.yml

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- name: Markup Link Checker (mlc)
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uses: becheran/mlc@c925f90a9a25e16e4c4bfa29058f6f9ffa9f0d8c # v0.21.0
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with:
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# Ignore external links that result in 403 errors during CI. Do not warn for redirects where we want to keep the vanity URL in the markdown or for GitHub links that redirect to the login.
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args: --ignore-links "https://www.anthropic.com/*,https://hackerone.com/anthropic-vdp/*" --do-not-warn-for-redirect-to "https://modelcontextprotocol.io/*,https://github.com/login?*" ./
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# Ignore external links that result in 403 errors during CI. Do not warn for redirects where we want to keep the vanity URL in the markdown or for GitHub links that redirect to the login, and DocFX snippet links.
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args: --ignore-links "https://www.anthropic.com/*,https://hackerone.com/anthropic-vdp/*" --do-not-warn-for-redirect-to "https://modelcontextprotocol.io/*,https://github.com/login?*" --ignore-links "*samples/*?name=snippet_*" ./docs

‎Directory.Build.props

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<PropertyGroup Condition="'$(GITHUB_ACTIONS)' == 'true'">
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<ContinuousIntegrationBuild>true</ContinuousIntegrationBuild>
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</PropertyGroup>
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<PropertyGroup Condition="$(TargetFramework.StartsWith('net4'))">
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<!-- Don't use x64 when running netfx test procs on Windows ARM -->
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<PreferNativeArm64>true</PreferNativeArm64>
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</PropertyGroup>
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</Project>

‎Directory.Packages.props

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<ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
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<System9Version>9.0.5</System9Version>
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<System10Version>10.0.0-preview.4.25258.110</System10Version>
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<MicrosoftExtensionsAIVersion>9.7.1</MicrosoftExtensionsAIVersion>
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<MicrosoftExtensionsAIVersion>9.8.0</MicrosoftExtensionsAIVersion>
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</PropertyGroup>
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<!-- Product dependencies netstandard -->
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<PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
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<!-- Testing dependencies -->
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<PackageVersion Include="Anthropic.SDK" Version="5.4.1" />
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<PackageVersion Include="Anthropic.SDK" Version="5.5.1" />
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<PackageVersion Include="coverlet.collector" Version="6.0.4">
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<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
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<PrivateAssets>all</PrivateAssets>
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</PackageVersion>
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<PackageVersion Include="GitHubActionsTestLogger" Version="2.4.1" />
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<PackageVersion Include="Microsoft.Extensions.AI.OpenAI" Version="9.7.0-preview.1.25356.2" />
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<PackageVersion Include="Microsoft.Extensions.AI.OpenAI" Version="9.8.0-preview.1.25412.6" />
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<PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="$(System9Version)" />
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<PackageVersion Include="Microsoft.Extensions.Hosting" Version="$(System9Version)" />
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<PackageVersion Include="Microsoft.Extensions.Logging" Version="$(System9Version)" />
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<PackageVersion Include="OpenTelemetry.Exporter.InMemory" Version="1.12.0" />
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<PackageVersion Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.12.0" />
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<PackageVersion Include="OpenTelemetry.Instrumentation.Http" Version="1.12.0" />
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<PackageVersion Include="OpenTelemetry.Extensions.Hosting" Version="1.12.0" />
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<PackageVersion Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.12.0" />
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<PackageVersion Include="OpenTelemetry.Extensions.Hosting" Version="1.12.0" />
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<PackageVersion Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.12.0" />
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<PackageVersion Include="Serilog.Extensions.Hosting" Version="9.0.0" />
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<PackageVersion Include="Serilog.Extensions.Logging" Version="9.0.1" />
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<PackageVersion Include="Serilog.Sinks.Console" Version="6.0.0" />
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<PackageVersion Include="Serilog.Sinks.Debug" Version="3.0.0" />
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<PackageVersion Include="Serilog.Sinks.File" Version="7.0.0" />
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<PackageVersion Include="Serilog" Version="4.3.0" />
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<PackageVersion Include="System.Linq.AsyncEnumerable" Version="$(System10Version)" />
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<PackageVersion Include="xunit.v3" Version="2.0.3" />
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<PackageVersion Include="xunit.runner.visualstudio" Version="3.1.1" />
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<PackageVersion Include="xunit.v3" Version="3.0.1" />
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<PackageVersion Include="xunit.runner.visualstudio" Version="3.1.4" />
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<PackageVersion Include="System.Net.Http" Version="4.3.4" />
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<PackageVersion Include="JsonSchema.Net" Version="7.3.4" />
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<PackageVersion Include="JsonSchema.Net" Version="7.4.0" />
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</ItemGroup>
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</Project>

‎docs/concepts/elicitation/elicitation.md

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---
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title: Elicitation
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author: mikekistler
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description: Enable interactive AI experiences by requesting user input during tool execution.
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uid: elicitation
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---
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## Elicitation
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The **elicitation** feature allows servers to request additional information from users during interactions. This enables more dynamic and interactive AI experiences, making it easier to gather necessary context before executing tasks.
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### Server Support for Elicitation
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Servers request structured data from users with the [ElicitAsync] extension method on [IMcpServer].
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The C# SDK registers an instance of [IMcpServer] with the dependency injection container,
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so tools can simply add a parameter of type [IMcpServer] to their method signature to access it.
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[ElicitAsync]: https://modelcontextprotocol.github.io/csharp-sdk/api/ModelContextProtocol.Server.McpServerExtensions.html#ModelContextProtocol_Server_McpServerExtensions_ElicitAsync_ModelContextProtocol_Server_IMcpServer_ModelContextProtocol_Protocol_ElicitRequestParams_System_Threading_CancellationToken_
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[IMcpServer]: https://modelcontextprotocol.github.io/csharp-sdk/api/ModelContextProtocol.Server.IMcpServer.html
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The MCP Server must specify the schema of each input value it is requesting from the user.
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Only primitive types (string, number, boolean) are supported for elicitation requests.
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The schema may include a description to help the user understand what is being requested.
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The server can request a single input or multiple inputs at once.
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To help distinguish multiple inputs, each input has a unique name.
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The following example demonstrates how a server could request a boolean response from the user.
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[!code-csharp[](samples/server/Tools/InteractiveTools.cs?name=snippet_GuessTheNumber)]
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### Client Support for Elicitation
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Elicitation is an optional feature so clients declare their support for it in their capabilities as part of the `initialize` request. In the MCP C# SDK, this is done by configuring an [ElicitationHandler] in the [McpClientOptions]:
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[ElicitationHandler]: https://modelcontextprotocol.github.io/csharp-sdk/api/ModelContextProtocol.Protocol.ElicitationCapability.html#ModelContextProtocol_Protocol_ElicitationCapability_ElicitationHandler
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[McpClientOptions]: https://modelcontextprotocol.github.io/csharp-sdk/api/ModelContextProtocol.Client.McpClientOptions.html
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[!code-csharp[](samples/client/Program.cs?name=snippet_McpInitialize)]
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The ElicitationHandler is an asynchronous method that will be called when the server requests additional information.
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The ElicitationHandler must request input from the user and return the data in a format that matches the requested schema.
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This will be highly dependent on the client application and how it interacts with the user.
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If the user provides the requested information, the ElicitationHandler should return an [ElicitResult] with the action set to "accept" and the content containing the user's input.
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If the user does not provide the requested information, the ElicitationHandler should return an [ElicitResult] with the action set to "reject" and no content.
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[ElicitResult]: https://modelcontextprotocol.github.io/csharp-sdk/api/ModelContextProtocol.Protocol.ElicitResult.html
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Below is an example of how a console application might handle elicitation requests.
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Here's an example implementation:
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[!code-csharp[](samples/client/Program.cs?name=snippet_ElicitationHandler)]

‎docs/concepts/elicitation/samples/client/ElicitationClient.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net9.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="ModelContextProtocol.Core" Version="0.3.0-preview.3" />
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</ItemGroup>
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</Project>

‎docs/concepts/elicitation/samples/client/Program.cs

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using System.Text.Json;
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using ModelContextProtocol.Client;
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using ModelContextProtocol.Protocol;
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var endpoint = Environment.GetEnvironmentVariable("ENDPOINT") ?? "http://localhost:3001";
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var clientTransport = new SseClientTransport(new()
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{
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Endpoint = new Uri(endpoint),
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TransportMode = HttpTransportMode.StreamableHttp,
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});
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// <snippet_McpInitialize>
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McpClientOptions options = new()
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{
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ClientInfo = new()
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{
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Name = "ElicitationClient",
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Version = "1.0.0"
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},
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Capabilities = new()
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{
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Elicitation = new()
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{
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ElicitationHandler = HandleElicitationAsync
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}
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}
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};
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await using var mcpClient = await McpClientFactory.CreateAsync(clientTransport, options);
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// </snippet_McpInitialize>
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var tools = await mcpClient.ListToolsAsync();
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foreach (var tool in tools)
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{
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Console.WriteLine($"Connected to server with tools: {tool.Name}");
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}
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Console.WriteLine($"Calling tool: {tools.First().Name}");
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var result = await mcpClient.CallToolAsync(toolName: tools.First().Name);
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foreach (var block in result.Content)
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{
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if (block is TextContentBlock textBlock)
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{
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Console.WriteLine(textBlock.Text);
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}
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else
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{
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Console.WriteLine($"Received unexpected result content of type {block.GetType()}");
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}
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}
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// <snippet_ElicitationHandler>
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async ValueTask<ElicitResult> HandleElicitationAsync(ElicitRequestParams? requestParams, CancellationToken token)
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{
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// Bail out if the requestParams is null or if the requested schema has no properties
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if (requestParams?.RequestedSchema?.Properties == null)
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{
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return new ElicitResult();
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}
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// Process the elicitation request
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if (requestParams?.Message is not null)
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{
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Console.WriteLine(requestParams.Message);
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}
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var content = new Dictionary<string, JsonElement>();
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// Loop through requestParams.requestSchema.Properties dictionary requesting values for each property
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foreach (var property in requestParams.RequestedSchema.Properties)
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{
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if (property.Value is ElicitRequestParams.BooleanSchema booleanSchema)
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{
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Console.Write($"{booleanSchema.Description}: ");
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var clientInput = Console.ReadLine();
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bool parsedBool;
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// Try standard boolean parsing first
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if (bool.TryParse(clientInput, out parsedBool))
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{
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content[property.Key] = JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize(parsedBool));
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}
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// Also accept "yes"/"no" as valid boolean inputs
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else if (string.Equals(clientInput?.Trim(), "yes", StringComparison.OrdinalIgnoreCase))
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{
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content[property.Key] = JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize(true));
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}
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else if (string.Equals(clientInput?.Trim(), "no", StringComparison.OrdinalIgnoreCase))
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{
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content[property.Key] = JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize(false));
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}
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}
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else if (property.Value is ElicitRequestParams.NumberSchema numberSchema)
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{
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Console.Write($"{numberSchema.Description}: ");
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var clientInput = Console.ReadLine();
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double parsedNumber;
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if (double.TryParse(clientInput, out parsedNumber))
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{
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content[property.Key] = JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize(parsedNumber));
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}
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}
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else if (property.Value is ElicitRequestParams.StringSchema stringSchema)
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{
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Console.Write($"{stringSchema.Description}: ");
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var clientInput = Console.ReadLine();
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content[property.Key] = JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize(clientInput));
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}
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}
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// Return the user's input
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return new ElicitResult
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{
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Action = "accept",
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Content = content
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};
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}
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// </snippet_ElicitationHandler>

‎docs/concepts/elicitation/samples/server/Elicitation.csproj

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<Project Sdk="Microsoft.NET.Sdk.Web">
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<PropertyGroup>
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<TargetFramework>net9.0</TargetFramework>
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<Nullable>enable</Nullable>
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<ImplicitUsings>enable</ImplicitUsings>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="ModelContextProtocol.AspNetCore" Version="0.3.0-preview.3" />
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</ItemGroup>
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</Project>

‎docs/concepts/elicitation/samples/server/Elicitation.http

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@HostAddress = http://localhost:3001
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# No session ID, so elicitation capabilities not declared.
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POST {{HostAddress}}/
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Accept: application/json, text/event-stream
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Content-Type: application/json
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MCP-Protocol-Version: 2025-06-18
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{
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"jsonrpc": "2.0",
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"id": 2,
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"method": "tools/call",
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"params": {
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"name": "guess_the_number"
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}
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}
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###
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POST {{HostAddress}}/
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Accept: application/json, text/event-stream
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Content-Type: application/json
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{
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"jsonrpc": "2.0",
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"id": 1,
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"method": "initialize",
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"params": {
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"clientInfo": {
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"name": "RestClient",
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"version": "0.1.0"
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},
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"capabilities": {
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"elicitation": {}
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},
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"protocolVersion": "2025-06-18"
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}
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}
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###
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@SessionId = lgEu87uKTy8kLffZayO5rQ
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POST {{HostAddress}}/
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Accept: application/json, text/event-stream
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Content-Type: application/json
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Mcp-Session-Id: {{SessionId}}
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MCP-Protocol-Version: 2025-06-18
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{
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"jsonrpc": "2.0",
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"id": 2,
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"method": "tools/call",
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"params": {
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"name": "guess_the_number"
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}
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}

‎docs/concepts/elicitation/samples/server/Program.cs

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using Elicitation.Tools;
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var builder = WebApplication.CreateBuilder(args);
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// Add services to the container.
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builder.Services.AddMcpServer()
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.WithHttpTransport(options =>
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options.IdleTimeout = Timeout.InfiniteTimeSpan // Never timeout
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)
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.WithTools<InteractiveTools>();
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builder.Logging.AddConsole(options =>
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{
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options.LogToStandardErrorThreshold = LogLevel.Information;
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});
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var app = builder.Build();
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app.UseHttpsRedirection();
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app.MapMcp();
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app.Run();

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