Merged in changes

Author: xenobiasoft

CLAUDE.md

@@ -5,7 +5,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 ## Commands
 
 ### Build & Run
-```bashV
+```bash
 # Build entire solution
 dotnet build
 

src/backend/Sudoku.McpServer/Tools/ApplicationInsightsTools.cs

@@ -20,9 +20,15 @@ public sealed class ApplicationInsightsTools
     public ApplicationInsightsTools(LogsQueryClient logsClient, IConfiguration config)
     {
         _logsClient = logsClient;
-        _workspaceId = config["AppInsights:WorkspaceId"]
-            ?? throw new InvalidOperationException(
-                "AppInsights:WorkspaceId is required. Set it in app settings (Log Analytics workspace GUID).");
+
+        var workspaceId = config["AppInsights:WorkspaceId"];
+        if (string.IsNullOrWhiteSpace(workspaceId))
+        {
+            throw new InvalidOperationException(
+                "AppInsights:WorkspaceId is required and cannot be empty. Set it in app settings (Log Analytics workspace GUID).");
+        }
+
+        _workspaceId = workspaceId;
     }
 
     // -------------------------------------------------------------------------