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feat: csharp mcp (#21)
* feat: csharp mcp * chore: entrypoint.sh * chore: remove unused file * fix: basic image * fix: Dockerfile bug * fix: dockerfile bug * fix: bug * fix: bug * chore: update README.md
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‎Service/mcp/csharp-1-0/Dockerfile

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FROM ghcr.io/labring-actions/devbox/debian-ssh-12.6:547a61
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USER root
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RUN cd /home/devbox/project && \
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rm -rf ./*
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COPY /Service/mcp/csharp-1-0/project /home/devbox/project
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RUN chown -R devbox:devbox /home/devbox/project && \
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chmod -R u+rw /home/devbox/project && \
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chmod -R +x /home/devbox/project/entrypoint.sh
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# Install dotnet
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RUN apt update && \
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apt install -y wget && \
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wget https://packages.microsoft.com/config/debian/12/packages-microsoft-prod.deb -O packages-microsoft-prod.deb && \
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sudo dpkg -i packages-microsoft-prod.deb && \
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rm packages-microsoft-prod.deb && \
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sudo apt-get update && \
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sudo apt-get install -y dotnet-sdk-9.0 && \
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chown -R devbox:devbox /home/devbox/project && \
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chmod -R u+rw /home/devbox/project && \
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chmod -R +x /home/devbox/project/entrypoint.sh && \
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rm -rf /var/lib/apt/lists/*
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RUN mkdir -p /home/devbox/.devbox

‎Service/mcp/csharp-1-0/project/.gitignore

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# Build results
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[Dd]ebug/
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[Dd]ebugPublic/
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[Rr]elease/
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[Rr]eleases/
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x64/
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x86/
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[Ww][Ii][Nn]32/
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[Aa][Rr][Mm]/
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[Aa][Rr][Mm]64/
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bld/
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[Bb]in/
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[Oo]bj/
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[Ll]og/
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[Ll]ogs/
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# Visual Studio files
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.vs/
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*.user
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*.userosscache
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*.sln.docstates
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*.userprefs
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# Visual Studio Code
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.vscode/
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*.code-workspace
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# User-specific files
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*.rsuser
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*.suo
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*.user
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*.userosscache
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*.sln.docstates
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# Environment files
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appsettings.Development.json
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# Temporary files
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*.tmp
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*.temp
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*.swp
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*~

‎Service/mcp/csharp-1-0/project/AspNetCoreSseServer.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" Version="0.1.0-preview.4" />
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<PackageReference Include="ModelContextProtocol.AspNetCore" Version="0.1.0-preview.4" />
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</ItemGroup>
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</Project>

‎Service/mcp/csharp-1-0/project/Program.cs

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using ModelContextProtocol.AspNetCore;
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var builder = WebApplication.CreateBuilder(args);
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builder.Services.AddMcpServer().WithToolsFromAssembly();
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builder.Services.AddCors(options =>
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{
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options.AddDefaultPolicy(policy =>
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{
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policy.WithOrigins()
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.AllowAnyHeader()
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.AllowAnyMethod();
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});
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});
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var app = builder.Build();
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app.UseCors();
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app.MapMcp();
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app.Run();

‎Service/mcp/csharp-1-0/project/Properties/launchSettings.json

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{
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"$schema": "https://json.schemastore.org/launchsettings.json",
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"profiles": {
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"http": {
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"commandName": "Project",
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"dotnetRunMessages": true,
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"launchBrowser": true,
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"applicationUrl": "http://localhost:3001",
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"environmentVariables": {
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"ASPNETCORE_ENVIRONMENT": "Development"
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}
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},
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"https": {
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"commandName": "Project",
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"dotnetRunMessages": true,
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"launchBrowser": true,
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"applicationUrl": "https://localhost:7133;http://localhost:3001",
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"environmentVariables": {
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"ASPNETCORE_ENVIRONMENT": "Development"
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}
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}
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}
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}

‎Service/mcp/csharp-1-0/project/README.md

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# C# MCP Server Example
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This is a C# and ASP.NET Core-based MCP (Model Context Protocol) server example project that demonstrates basic server functionality implementation.
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## Project Description
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This project creates a lightweight MCP server using the ASP.NET Core framework. The server runs on port 3001 by default and provides example tools such as Echo and LLM sampling. The project supports both development and production environment modes with graceful shutdown capabilities.
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## Environment
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This project runs on a Debian 12 system with .NET 9.0 SDK. The development environment is pre-configured in the Devbox environment, so you don't need to worry about installing .NET SDK or system dependencies. The development environment includes all necessary tools for building and running C# applications. If you need to make adjustments to match your specific requirements, you can modify the configuration files accordingly.
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## Project Execution
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**Development mode:** For normal development environment, simply enter Devbox and run `bash entrypoint.sh` in the terminal. This will compile your C# code with debugging flags and run the executable.
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**Production mode:** After release, the project will be automatically packaged into a Docker image and deployed according to the `entrypoint.sh` script (run `bash entrypoint.sh production`). This will build an optimized executable binary and run it.
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DevBox: Code. Build. Deploy. We've Got the Rest.
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With DevBox, you can focus entirely on writing great code while we handle the infrastructure, scaling, and deployment. Seamless development from start to production.

‎Service/mcp/csharp-1-0/project/Tools/EchoTool.cs

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using ModelContextProtocol.Server;
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using System.ComponentModel;
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namespace TestServerWithHosting.Tools;
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[McpServerToolType]
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public static class EchoTool
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{
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[McpServerTool, Description("Echoes the input back to the client.")]
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public static string Echo(string message)
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{
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return "hello " + message;
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}
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}

‎Service/mcp/csharp-1-0/project/Tools/SampleLlmTool.cs

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using Microsoft.Extensions.AI;
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using ModelContextProtocol.Server;
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using System.ComponentModel;
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namespace TestServerWithHosting.Tools;
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/// <summary>
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/// This tool uses dependency injection and async method
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/// </summary>
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[McpServerToolType]
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public static class SampleLlmTool
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{
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[McpServerTool(Name = "sampleLLM"), Description("Samples from an LLM using MCP's sampling feature")]
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public static async Task<string> SampleLLM(
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IMcpServer thisServer,
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[Description("The prompt to send to the LLM")] string prompt,
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[Description("Maximum number of tokens to generate")] int maxTokens,
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CancellationToken cancellationToken)
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{
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ChatMessage[] messages =
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[
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new(ChatRole.System, "You are a helpful test server."),
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new(ChatRole.User, prompt),
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];
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ChatOptions options = new()
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{
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MaxOutputTokens = maxTokens,
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Temperature = 0.7f,
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};
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var samplingResponse = await thisServer.AsSamplingChatClient().GetResponseAsync(messages, options, cancellationToken);
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return $"LLM sampling result: {samplingResponse}";
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}
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}

‎Service/mcp/csharp-1-0/project/appsettings.json

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{
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"Logging": {
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"LogLevel": {
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"Default": "Information",
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"Microsoft.AspNetCore": "Warning"
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}
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},
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"AllowedHosts": "*"
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}

‎Service/mcp/csharp-1-0/project/entrypoint.sh

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#!/bin/bash
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app_env=${1:-development}
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# Development environment commands
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dev_commands() {
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echo "Running MCP Csharp development environment..."
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dotnet run
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}
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# Production environment commands
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prod_commands() {
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echo "Running MCP Csharp production build..."
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dotnet publish
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echo "Starting MCP Csharp production preview server..."
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dotnet run -- --host 0.0.0.0 --port 3001
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}
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# Check environment variables to determine the running environment
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if [ "$app_env" = "production" ] || [ "$app_env" = "prod" ] ; then
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echo "Production environment detected"
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prod_commands
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else
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echo "Development environment detected"
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dev_commands
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fi

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