basic_dotnet_mcp_server.cs

basic_dotnet_mcp_server.cs · 1.4 KiB · C# Raw

/*
dotnet add package ModelContextProtocol --prerelease
dotnet add package ModelContextProtocol.AspNetCore --prerelease
dotnet add package Microsoft.Extensions.Hosting
*/

using ModelContextProtocol.Server;
using System.ComponentModel;

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddMcpServer()
    .WithHttpTransport()
    .WithToolsFromAssembly();
var app = builder.Build();

app.MapMcp();

app.Run("http://localhost:3001");

[McpServerToolType]
public static class EchoTool
{
    [McpServerTool, Description("Echoes the message back to the client.")]
    public static string Echo(string message) => $"Yo!  You said '{message}'";
}

// Add a strongly-typed response class for weather
public record WeatherResponse(string City, int Temperature, int Humidity, string Condition);

[McpServerToolType]
public static class WeatherTool
{
    [McpServerTool, Description("Returns weather data as a typed object; framework will serialize to JSON.")]
    public static WeatherResponse GetWeather(string? city)
    {
        string cityName = city ?? string.Empty;
        int temperature = cityName.Length;
        int humidity = temperature * 5;
        var conditions = new[] { "Sunny", "Cloudy", "Rainy", "Windy" };
        string condition = conditions[temperature % conditions.Length];
        return new WeatherResponse(cityName, temperature, humidity, condition);
    }
}

1	/*
2	dotnet add package ModelContextProtocol --prerelease
3	dotnet add package ModelContextProtocol.AspNetCore --prerelease
4	dotnet add package Microsoft.Extensions.Hosting
5	*/
6
7	using ModelContextProtocol.Server;
8	using System.ComponentModel;
9
10	var builder = WebApplication.CreateBuilder(args);
11	builder.Services.AddMcpServer()
12	.WithHttpTransport()
13	.WithToolsFromAssembly();
14	var app = builder.Build();
15
16	app.MapMcp();
17
18	app.Run("http://localhost:3001");
19
20	[McpServerToolType]
21	public static class EchoTool
22	{
23	[McpServerTool, Description("Echoes the message back to the client.")]
24	public static string Echo(string message) => $"Yo! You said '{message}'";
25	}
26
27	// Add a strongly-typed response class for weather
28	public record WeatherResponse(string City, int Temperature, int Humidity, string Condition);
29
30	[McpServerToolType]
31	public static class WeatherTool
32	{
33	[McpServerTool, Description("Returns weather data as a typed object; framework will serialize to JSON.")]
34	public static WeatherResponse GetWeather(string? city)
35	{
36	string cityName = city ?? string.Empty;
37	int temperature = cityName.Length;
38	int humidity = temperature * 5;
39	var conditions = new[] { "Sunny", "Cloudy", "Rainy", "Windy" };
40	string condition = conditions[temperature % conditions.Length];
41	return new WeatherResponse(cityName, temperature, humidity, condition);
42	}
43	}
44