MCPSharp MCP Server

@afrise

Basic information

About MCPSharp MCP Server

MCPSharp is a .NET library that helps you build Model Context Protocol (MCP) servers and clients - the standardized API protocol used by AI assistants and models.

#sdk #ai #dotnet #mcp#dotnet-standard#semantic-kernel#aifunctions#microsoft-extensions-ai#model-context-protocol #mcp-server #mcp-client

MCPSharp MCP Server config

No standard config provided

This server doesn't expose a parseable MCP config block in its README. See the repository for install instructions.

Repository

MCPSharp MCP Server tools

Tool list not available yet

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We auto-extract tools from the README. The maintainer can list them under a ## Tools heading to populate this section.

Overview

What is MCPSharp?

MCPSharp is a .NET library that helps you build Model Context Protocol (MCP) servers and clients, the standardized API protocol used by AI assistants and models. It allows you to create MCP-compliant tools and functions, connect to MCP servers from C# code, and expose .NET methods as MCP endpoints using simple attributes.

How to use MCPSharp?

Install the NuGet package with dotnet add package MCPSharp. Define a class and mark methods with the [McpTool] attribute, then start the server by calling MCPServer.StartAsync("serverName", "1.0.0"). Optionally, register tools from referenced libraries using MCPServer.Register<T>().

Key features of MCPSharp

Easy-to-use attribute-based API ([McpTool], [McpResource])
Built-in JSON-RPC support with automatic request/response handling
Automatic parameter validation and type conversion
Rich documentation support through XML comments
Dynamic tool registration with custom implementation logic
Integration with Microsoft.Extensions.AI and Semantic Kernel

Use cases of MCPSharp

Create tools that AI assistants like Anthropic's Claude Desktop can use
Build MCP-compliant APIs without dealing with protocol details
Expose existing .NET code as MCP endpoints
Add AI capabilities to applications through standardized interfaces
Integrate with Microsoft.Extensions.AI or Semantic Kernel without vendor lock-in

Frequently asked questions

What are the runtime dependencies for MCPSharp?

MCPSharp requires any version of .NET that supports .NET Standard 2.0.

How do I define a tool in MCPSharp?

Create a class and mark a method with the `[McpTool]` attribute, optionally providing a name and description. Use `[McpParameter]` to specify parameter metadata.

Can I use MCPSharp with Semantic Kernel?

Yes. Mark methods with `[KernelFunction]` and `[Description]`, then register the class with `MCPServer.Register<T>()`. The server will expose those methods as MCP tools.

How does MCPSharp integrate with Microsoft.Extensions.AI?

On the client side, call `client.GetFunctionsAsync()` to obtain a list of `AIFunction` objects that can be plugged into `ChatOptions.Tools` for any `IChatClient` implementation.

Are there any migration notes from previous versions?

Yes. The `[McpFunction]` attribute is deprecated and replaced with `[McpTool]`. Also, use `MCPServer.Register<T>()` instead of the deprecated `MCPServer.RegisterTool<T>()`.

Comments

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