dotnet-mcp-builder
Building MCP servers in .NET
This skill helps you write production-quality MCP servers and basic clients in C#/.NET against the official ModelContextProtocol NuGet packages, maintained by Microsoft and the MCP project. It targets the stable 1.x line and the current spec (2025-11-25).
When this skill earns its keep
The .NET MCP SDK had years of preview packages (0.x-preview) before reaching 1.0. Without help, the model tends to:
- Pin a stale preview version that won't compile against current samples.
- Miss recent spec features (elicitation URL mode, MCP Apps, structured content blocks).
- Get HTTP transport details wrong (stateful/stateless, proxy buffering, OAuth wiring).
- Forget the STDIO stdout/stderr trap.
If the task is one of those, load the matching reference and follow it. If it's truly trivial (e.g. "rename this tool method"), you don't need to read everything — the cardinal rules below are the minimum.
Mental model in 30 seconds
A .NET MCP server is an ordinary Microsoft.Extensions.Hosting (or WebApplication) app that wires an MCP server through DI:
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