메인 함수 있는 헬로월드로 변경

.editorconfig

@@ -1,5 +0,0 @@
-root = true
-
-[*]
-end_of_line = lf
-charset = utf-8-bom

Program.cs

@@ -1,40 +1,7 @@
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Hosting;
-using Microsoft.Extensions.Logging;
-using ModelContextProtocol.Server;
-using System.ComponentModel;
-
-internal class Program
+internal class Program
 {
-    private static async Task Main(string[] args)
+    private static void Main(string[] args)
     {
-        var builder = Host.CreateApplicationBuilder(args);
-        builder.Logging.AddConsole(consoleLoggerOptions =>
-        { 
-            consoleLoggerOptions.LogToStandardErrorThreshold = LogLevel.Trace;
-        });
-
-        builder.Services.
-            AddMcpServer().
-            WithStdioServerTransport().
-            WithToolsFromAssembly();
-
-        await builder.Build().RunAsync();
-    }
-}
-
-[McpServerToolType]
-public static class EchoTool
-{
-    [McpServerTool, Description("Echoes the message back to the client.")]
-    public static string Echo(string message) => $"Hello from C#: {message}";
-
-    [McpServerTool, Description("Echoes in reverse the message sent by the client.")]
-    public static string ReverseEcho(string message)
-    {
-        char[] charArray = message.ToCharArray();
-        Array.Reverse(charArray);
-        var reversed = new string(charArray);
-        return reversed;
+        Console.WriteLine("Hello, World!");
     }
 }