Show HN: A catalog of single-file MCP servers build with C# (opens in new tab)

Since last week I played a lot with using new dotnet run app.cs feature, as well as Agents in Visual Studio and in terminal. And I found out that this feature works very good with MCP concepts

You basically could write whatever you need (like I did with image resizer), add it to .mcp.json and run it locally, no Docker containers or npm dependencies or anything else required. Each server is completely self-contained: everything from the MCP protocol implementation to the actual tools in one .cs file

So over the weekend I created open-source catalogue to collect cool and useful one-file MCPs and I welcome you to try to create some MCPs for your work and maybe share them with the world