64 lines
2.3 KiB
Markdown
64 lines
2.3 KiB
Markdown
# 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:
|
|
|
|
```bash
|
|
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:
|
|
|
|
```bash
|
|
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:
|
|
```bash
|
|
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:
|
|
```bash
|
|
(
|
|
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:
|
|
```bash
|
|
(
|
|
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
|
|
|
|
- [File-Based Programs Tutorial](https://learn.microsoft.com/en-us/dotnet/csharp/fundamentals/tutorials/file-based-programs)
|
|
- [C# Preprocessor Directives for File-Based Apps](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/preprocessor-directives#file-based-apps)
|
|
- [Model Context Protocol Specification](https://spec.modelcontextprotocol.io/)
|