Add EverythingServer sample (#151)

samples/EverythingServer/Tools/PrintEnvTool.cs

@@ -0,0 +1,18 @@
+using ModelContextProtocol.Server;
+using System.ComponentModel;
+using System.Text.Json;
+
+namespace EverythingServer.Tools;
+
+[McpServerToolType]
+public class PrintEnvTool
+{
+    private static readonly JsonSerializerOptions options = new()
+    {
+        WriteIndented = true
+    };
+
+    [McpServerTool(Name = "printEnv"), Description("Prints all environment variables, helpful for debugging MCP server configuration")]
+    public static string PrintEnv() =>
+        JsonSerializer.Serialize(Environment.GetEnvironmentVariables(), options);
+}