[Repo] modelcontextprotocol/csharp-sdk: The official C# SDK for Model Context Protocol servers and clients. Maintained in collaboration with Microsoft.

The modelcontextprotocol/csharp-sdk is the official C# SDK for implementing Model Context Protocol (MCP) servers and clients, developed collaboratively with Microsoft. With over 4,000 stars, it provides developers with a comprehensive toolkit for building MCP-compliant applications in C#. The SDK enables seamless integration of AI agents with various data sources and tools through the standardized MCP interface.

Key Points

• •Official C# implementation of Model Context Protocol maintained by Anthropic and Microsoft
• •Supports both MCP server and client development in C#
• •Enables AI agents to connect with external data sources, APIs, and tools
• •Provides standardized protocol implementation for interoperability
• •Active maintenance with recent updates (last pushed March 2026)
• •High community adoption with 4,000+ GitHub stars
• •Facilitates building context-aware AI applications with structured data access
• •Collaborative development between Anthropic and Microsoft teams

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