csharp-sdk

The official C# SDK for building MCP servers and clients. If you're in the .NET ecosystem and want to expose tools, resources, or prompts to AI assistants, this is the foundation you build on.

Add the NuGet package, define your tools as methods, and the SDK handles protocol negotiation and transport. Clean API design that feels native to C#. No external service dependencies.

Maintained by the Model Context Protocol organization, the same team behind the spec itself. Essential if you're building MCP integrations in C# or .NET. Skip it if you're consuming servers, not building them.