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File-Based MCP Server Sample

This sample demonstrates how to create a complete MCP (Model Context Protocol) server using .NET 10's file-based programs feature. Unlike traditional .NET projects that require a .csproj file, file-based programs allow you to write and run complete applications in a single .cs file.

Requirements

  • .NET 10 SDK (RC2 or later)
  • No project file required!

Running the Sample

Simply run the Program.cs file directly:

dotnet run Program.cs

The server will start and listen for MCP messages on stdin/stdout (stdio transport).

Making it Executable (Unix/Linux/macOS)

On Unix-like systems, you can make the file executable:

chmod +x Program.cs
./Program.cs

Note: The shebang line uses /usr/bin/env to locate dotnet, so ensure it's in your PATH.

Testing the Server

You can test the server by using @modelcontextprotocol/inspector, any stdio-compatible client, or sending JSON-RPC messages to stdin. Here's an example:

Initialize the server:

echo '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test-client","version":"1.0"}}}' | dotnet run Program.cs

List available tools:

(
  echo '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test-client","version":"1.0"}}}'
  sleep 0.5
  echo '{"jsonrpc":"2.0","id":2,"method":"tools/list","params":{}}'
  sleep 1
) | dotnet run Program.cs 2>/dev/null | grep '^{' | jq .

Call the echo tool:

(
  echo '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test-client","version":"1.0"}}}'
  sleep 0.5
  echo '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"echo","arguments":{"message":"Hello, MCP!"}}}'
  sleep 1
) | dotnet run Program.cs 2>/dev/null | grep '^{' | jq .

Reference