MCP C# SDK

MCP C# SDK is a C# software development kit for the Model Context Protocol, enabling .NET applications to build and communicate with MCP servers and clients.

The MCP C# SDK provides the tools for .NET applications, services, and libraries to interface with the Model Context Protocol. It allows developers to create MCP clients and servers, facilitating secure integration between large language models and various data sources or tools. The SDK is maintained in collaboration with Microsoft as the official implementation for the .NET ecosystem. Developers can access stable and prerelease versions through the NuGet Gallery under the ModelContextProtocol profile. It includes comprehensive API documentation and conceptual guides for implementation.

MCP C# SDK at a glance

Best for: Software engineer
Runs on: API
Pricing: Open source (MIT License)
Released: March 2025
Category: AI coding tool
Website: csharp.sdk.modelcontextprotocol.io

Key features

Support for building MCP clients
Support for building MCP servers
NuGet package distribution
MIT licensed codebase
Official .NET integration for Model Context Protocol

Use it for

Building MCP servers in C#
Creating .NET MCP clients
Integrating LLMs with C# applications
Connecting .NET services to external data sources

Alternatives to MCP C# SDK

MCP Python SDK — Builds protocol servers and clients using standard Python type hints.
MCP Java SDK — Official Java implementation with core STDIO, SSE, and Streamable HTTP transports.
MCP TypeScript SDK — Official TypeScript implementation of the Model Context Protocol.
FastMCP — The standard framework for building Model Context Protocol servers and clients.
Official MCP Servers — Find trusted official MCP servers without unofficial forks or abandoned projects.
MCP Rust SDK — Build official Model Context Protocol servers and clients in Rust.
Spec Workflow MCP — It brings sequential spec creation and real-time tracking to your AI workflow.
Coding Tools MCP — Turns any chat app into a coding agent with strict workspace safety boundaries.
AWS MCP Servers — Provides real-time access to official AWS documentation and infrastructure tools.
MCP Toolbox for Databases — Connects AI agents to diverse enterprise databases with built-in security and observability.
MCPX — Monetize Model Context Protocol servers and build AI agent tools.
MCP Registry — It enables discovery of Model Context Protocol servers.

All MCP C# SDK alternatives