Fix duplicate connection verification logs: add debounce and state-ch… (#413)

* Fix duplicate connection verification logs: add debounce and state-change-only logging

* Address CodeRabbit feedback: use status constants, fix comments, remove redundant code

MCPForUnity/Editor/Windows/Components/Connection/McpConnectionSection.cs

@@ -44,6 +44,14 @@ namespace MCPForUnity.Editor.Windows.Components.Connection
         private Button testConnectionButton;
 
         private bool connectionToggleInProgress;
+        private Task verificationTask;
+        private string lastHealthStatus;
+
+        // Health status constants
+        private const string HealthStatusUnknown = "Unknown";
+        private const string HealthStatusHealthy = "Healthy";
+        private const string HealthStatusPingFailed = "Ping Failed";
+        private const string HealthStatusUnhealthy = "Unhealthy";
 
         // Events
         public event Action OnManualConfigUpdateRequested;
@@ -173,7 +181,7 @@ namespace MCPForUnity.Editor.Windows.Components.Connection
                 statusIndicator.AddToClassList("disconnected");
                 connectionToggleButton.text = "Start Session";
 
-                healthStatusLabel.text = "Unknown";
+                healthStatusLabel.text = HealthStatusUnknown;
                 healthIndicator.RemoveFromClassList("healthy");
                 healthIndicator.RemoveFromClassList("warning");
                 healthIndicator.AddToClassList("unknown");
@@ -408,15 +416,33 @@ namespace MCPForUnity.Editor.Windows.Components.Connection
         }
 
         public async Task VerifyBridgeConnectionAsync()
+        {
+            // Prevent concurrent verification calls
+            if (verificationTask != null && !verificationTask.IsCompleted)
+            {
+                return;
+            }
+
+            verificationTask = VerifyBridgeConnectionInternalAsync();
+            await verificationTask;
+        }
+
+        private async Task VerifyBridgeConnectionInternalAsync()
         {
             var bridgeService = MCPServiceLocator.Bridge;
             if (!bridgeService.IsRunning)
             {
-                healthStatusLabel.text = "Disconnected";
+                healthStatusLabel.text = HealthStatusUnknown;
                 healthIndicator.RemoveFromClassList("healthy");
                 healthIndicator.RemoveFromClassList("warning");
                 healthIndicator.AddToClassList("unknown");
+                
+                // Only log if state changed
+                if (lastHealthStatus != HealthStatusUnknown)
+                {
                     McpLog.Warn("Cannot verify connection: Bridge is not running");
+                    lastHealthStatus = HealthStatusUnknown;
+                }
                 return;
             }
 
@@ -426,23 +452,45 @@ namespace MCPForUnity.Editor.Windows.Components.Connection
             healthIndicator.RemoveFromClassList("warning");
             healthIndicator.RemoveFromClassList("unknown");
 
+            string newStatus;
             if (result.Success && result.PingSucceeded)
             {
-                healthStatusLabel.text = "Healthy";
+                newStatus = HealthStatusHealthy;
+                healthStatusLabel.text = newStatus;
                 healthIndicator.AddToClassList("healthy");
+                
+                // Only log if state changed
+                if (lastHealthStatus != newStatus)
+                {
                     McpLog.Debug($"Connection verification successful: {result.Message}");
+                    lastHealthStatus = newStatus;
+                }
             }
             else if (result.HandshakeValid)
             {
-                healthStatusLabel.text = "Ping Failed";
+                newStatus = HealthStatusPingFailed;
+                healthStatusLabel.text = newStatus;
                 healthIndicator.AddToClassList("warning");
+                
+                // Log once per distinct warning state
+                if (lastHealthStatus != newStatus)
+                {
                     McpLog.Warn($"Connection verification warning: {result.Message}");
+                    lastHealthStatus = newStatus;
+                }
             }
             else
             {
-                healthStatusLabel.text = "Unhealthy";
+                newStatus = HealthStatusUnhealthy;
+                healthStatusLabel.text = newStatus;
                 healthIndicator.AddToClassList("warning");
+                
+                // Log once per distinct error state
+                if (lastHealthStatus != newStatus)
+                {
                     McpLog.Error($"Connection verification failed: {result.Message}");
+                    lastHealthStatus = newStatus;
+                }
             }
         }
     }

MCPForUnity/Editor/Windows/MCPForUnityEditorWindow.cs

@@ -21,6 +21,8 @@ namespace MCPForUnity.Editor.Windows
 
         private static readonly HashSet<MCPForUnityEditorWindow> OpenWindows = new();
         private bool guiCreated = false;
+        private double lastRefreshTime = 0;
+        private const double RefreshDebounceSeconds = 0.5;
 
         public static void ShowWindow()
         {
@@ -181,6 +183,14 @@ namespace MCPForUnity.Editor.Windows
 
         private void RefreshAllData()
         {
+            // Debounce rapid successive calls (e.g., from OnFocus being called multiple times)
+            double currentTime = EditorApplication.timeSinceStartup;
+            if (currentTime - lastRefreshTime < RefreshDebounceSeconds)
+            {
+                return;
+            }
+            lastRefreshTime = currentTime;
+
             connectionSection?.UpdateConnectionStatus();
 
             if (MCPServiceLocator.Bridge.IsRunning)