csharp-sdk
The official C# SDK for Model Context Protocol servers and clients. Maintained in collaboration with Microsoft. Trusted by 3500+ developers.
Documentation
MCP C# SDK
The official C# SDK for the Model Context Protocol, enabling .NET applications, services, and libraries to implement and interact with MCP clients and servers. Please visit the API documentation for more details on available functionality.
Packages
The SDK packages are:
Getting Started
To get started, see the Getting Started guide in the conceptual documentation for installation instructions, package-selection guidance, and complete examples for both clients and servers.
You can also browse the samples directory and the API documentation for more details on available functionality.
About MCP
The Model Context Protocol (MCP) is an open protocol that standardizes how applications provide context to Large Language Models (LLMs). It enables secure integration between LLMs and various data sources and tools.
For more information about MCP:
Cross-Application Access (Identity Assertion Authorization Grant flow)
The SDK provides support for the Identity Assertion Authorization Grant flow
via `IdentityAssertionGrantProvider`. See the Cross-Application Access section in the transport docs for full usage details.
License
This project is licensed under the Apache License 2.0.
Frequently asked questions
What is csharp-sdk?
csharp-sdk is The official C# SDK for Model Context Protocol servers and clients. Maintained in collaboration with Microsoft. Trusted by 3500+ developers.
How do I install csharp-sdk?
Open the GitHub repository and follow its README. Most MCP servers are added to your client's MCP config, then called by your agent.
Is csharp-sdk open source?
Yes — it is hosted on GitHub at https://github.com/modelcontextprotocol/csharp-sdk and has 3,512 stars.
Related MCP tools
unity-mcpAn MCP server that allows MCP clients like Claude Desktop or Cursor to perform actions in the Unity Editor C#-based implementation.
mcp-unityModel Context Protocol (MCP) plugin to connect with Unity Editor — designed for OpenAI, Gemini, Claude, Deepseek and Grok interoperability
git-mcpPut an end to code hallucinations! GitMCP is a free, open-source, remote MCP server for any GitHub project TypeScript-based implementation.
modelcontextprotocolSpecification and documentation for the Model Context Protocol TypeScript-based implementation. Trusted by 6100+ developers.
cursor-talk-to-figma-mcpCTTF: MCP integration between Cursor and Figma, allowing Cursor Agentic AI to communicate with Figma for reading designs and modifying them programmatically.
whatsapp-mcpWhatsApp MCP server Go-based implementation. Trusted by 4900+ developers. Trusted by 4900+ developers. Trusted by 4900+ developers.
Run your own MCP server? See who uses it and what to fix.
Measure it with TrackMCP