DotNet MCP Server Demo

MCP Demo - .NET Web API with Model Context Protocol Server

This project demonstrates a simple .NET 8 Web API that implements a Model Context Protocol (MCP) server with Basic Authentication.

Features

MCP Server Implementation: Handles MCP protocol messages including initialization, tool calls, and resource management
Basic Authentication: Simple username/password authentication for API endpoints
Sample Tools: Includes example tools like time retrieval, echo, and calculator
RESTful API: Standard REST endpoints for MCP operations
Swagger Documentation: Auto-generated API documentation

Prerequisites

.NET 8.0 SDK or later
Visual Studio 2022, VS Code, or any preferred IDE

Getting Started

1. Restore Dependencies

dotnet restore

2. Build the Project

dotnet build

3. Run the Application

dotnet run

The application will start on https://localhost:5001 and http://localhost:5000.

4. Access Swagger UI

Open your browser and navigate to: https://localhost:5001/swagger

Authentication

The API uses Basic Authentication with hardcoded credentials for demonstration:

Username: admin
Password: password123

Using Basic Auth in HTTP Requests

Include the Authorization header with Base64 encoded credentials:

Authorization: Basic YWRtaW46cGFzc3dvcmQxMjM=

API Endpoints

MCP Endpoints (Require Authentication)

POST /api/mcp/message - Handle MCP protocol messages
GET /api/mcp/tools - Get available tools
GET /api/mcp/resources - Get available resources

Health Check (Public)

GET /api/mcp/health - Health check endpoint

Sample Endpoints

GET /api/weather - Get weather data (requires authentication)
GET /api/weather/public - Get public weather data (no authentication)

MCP Protocol Usage

Initialize the Server

POST /api/mcp/message
{
  "jsonrpc": "2.0",
  "id": "1",
  "method": "initialize",
  "params": {
    "protocolVersion": "2024-11-05",
    "capabilities": {},
    "clientInfo": {
      "name": "Test Client",
      "version": "1.0.0"
    }
  }
}

List Available Tools

POST /api/mcp/message
{
  "jsonrpc": "2.0",
  "id": "2",
  "method": "tools/list"
}

Call a Tool

POST /api/mcp/message
{
  "jsonrpc": "2.0",
  "id": "3",
  "method": "tools/call",
  "params": {
    "name": "echo",
    "arguments": {
      "message": "Hello, MCP!"
    }
  }
}

Calculate Tool Example

POST /api/mcp/message
{
  "jsonrpc": "2.0",
  "id": "4",
  "method": "tools/call",
  "params": {
    "name": "calculate",
    "arguments": {
      "operation": "add",
      "a": 10,
      "b": 5
    }
  }
}

Available Tools

get_time: Returns the current date and time
echo: Echoes back the provided message
calculate: Performs basic arithmetic operations (add, subtract, multiply, divide)

Project Structure

MCPDemo/
├── Controllers/
│   ├── McpController.cs      # MCP protocol endpoints
│   └── WeatherController.cs  # Sample API endpoints
├── Models/
│   └── McpModels.cs         # MCP protocol data models
├── Services/
│   ├── BasicAuthenticationHandler.cs  # Basic auth implementation
│   └── McpServer.cs         # MCP server logic
├── Program.cs               # Application entry point
├── appsettings.json        # Configuration
└── MCPDemo.csproj          # Project file

Security Considerations

⚠️ Important: This implementation uses hardcoded credentials for demonstration purposes only. In production:

Use proper user authentication with a database
Implement secure password hashing
Use HTTPS only
Consider JWT tokens instead of Basic Auth
Implement proper authorization policies
Add rate limiting and input validation

Extending the Server

Adding New Tools

Add the tool definition in McpServer.GetToolsAsync()
Implement the tool logic in McpServer.ExecuteToolAsync()
Define the input schema for the tool

Adding New Resources

Add resource definitions in McpServer.GetResourcesAsync()
Implement resource reading logic in HandleResourceReadAsync()

Testing with curl

Health Check

curl -X GET https://localhost:5001/api/mcp/health

Get Tools (with auth)

curl -X GET https://localhost:5001/api/mcp/tools -H "Authorization: Basic YWRtaW46cGFzc3dvcmQxMjM="

Send MCP Message

curl -X POST https://localhost:5001/api/mcp/message `
  -H "Content-Type: application/json" `
  -H "Authorization: Basic YWRtaW46cGFzc3dvcmQxMjM=" `
  -d '{
    "jsonrpc": "2.0",
    "id": "1",
    "method": "initialize",
    "params": {
      "protocolVersion": "2024-11-05",
      "capabilities": {},
      "clientInfo": {"name": "Test Client", "version": "1.0.0"}
    }
  }'

License

This project is for demonstration purposes only.

This server cannot be installed

security - not tested

license - not found

quality - not tested

How are these scores calculated?

remote-capable server

The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.

A demonstration .NET 8 Web API that implements the Model Context Protocol with basic authentication. Provides sample tools for time retrieval, echo functionality, and basic arithmetic calculations through RESTful endpoints.

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