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Tool.cs

using Microsoft.Extensions.AI;
using ModelContextProtocol;
using ModelContextProtocol.Protocol;
using ModelContextProtocol.Server;
using System.ComponentModel;

namespace Tools;

[McpServerToolType]
public sealed class GreetingTools
{
[McpServerTool, Description("Says Hello to a user")]
public static string Echo(string username)
{
return "Hello " + username;
}
}

Program.cs

using Microsoft.Extensions.DependencyInjection;
using ModelContextProtocol;
using ModelContextProtocol.Server;

var builder = WebApplication.CreateBuilder(args);

// Register MCP server and discover tools from the current assembly
builder.Services.AddMcpServer()
.WithHttpTransport()
.WithToolsFromAssembly();

var app = builder.Build();

// Add MCP middleware
app.MapMcp();

app.Run();