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Guide: Building MCP Servers in C# and .NET 9 Using SDK, DI, and Native AOT

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Part 12 of a 15-part series on Model Context Protocol (MCP) focuses on the .NET tooling that simplifies building MCP servers in C#. The MCP C# SDK handles JSON-RPC framing, capability negotiation, and JSON Schema generation automatically, replacing error-prone hand-rolled code. Developers can use attributed classes and typed method signatures so the SDK auto-generates tool schemas, eliminating the need to maintain separate JSON Schema definitions. Dependency injection is fully supported, with the SDK resolving scoped tool instances per call from the app's existing DI container. The guide also covers hosting models, in-memory transport for unit testing, and Native AOT support for faster cold starts.

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Guide: Building MCP Servers in C# and .NET 9 Using SDK, DI, and Native AOT · ShortSingh