MCPSharp

Overview

MCPSharp is a comprehensive .NET implementation of the Model Context Protocol, providing developers with tools to create both MCP servers and clients. It offers attribute-based APIs that simplify exposing .NET methods as MCP tools and resources, handling JSON-RPC communication seamlessly behind the scenes. The library supports Microsoft.Extensions.AI integration and Semantic Kernel, making it versatile for different AI application scenarios.

Try asking AI

After installing, here are 5 things you can ask your AI assistant:

• addint Add(int a, int b)

  Adds two numbers together

  Try:Calculate 5 plus 3Try:What's 12 + 7?Try:Add 15 and 20
• dynamicToolstring dynamicTool(string input)

  A dynamic tool that processes input

  Try:Use the dynamic tool with hello worldTry:Process input using dynamic toolTry:Call dynamicTool with test message
• MyFunctionstring MyFunction(string input)

  Processes input string

  Try:Process my input textTry:Apply MyFunction to dataTry:Transform this string

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Installation

dotnet add package MCPSharp

using MCPSharp;

public class Calculator
{
    [McpTool("add", "Adds two numbers")]
    public static int Add([McpParameter(true)] int a, [McpParameter(true)] int b)
    {
        return a + b;
    }
}

await MCPServer.StartAsync("CalculatorServer", "1.0.0");

{
  "mcpServers": {
    "mcpsharp-example": {
      "command": "dotnet",
      "args": ["run", "--project", "/path/to/your/project.csproj"],
      "env": {}
    }
  }
}

FAQ

What's the difference between [McpTool] and [McpFunction]?

[McpFunction] is deprecated and replaced with [McpTool] for better alignment with MCP standards. You should use [McpTool] for all new implementations.

Can I use MCPSharp with Microsoft.Extensions.AI?

Yes, MCPSharp integrates with Microsoft.Extensions.AI, allowing tools to be exposed as AIFunctions. You can use the MCPClient.GetFunctionsAsync() method to retrieve tools as AIFunctions.

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