feat(batch_execute): improve error handling with success detection and fail-fast support (#531)

- Add DetermineCallSucceeded() to check command success via IMcpResponse interface or JObject/JToken 'success' field
- Track invocationFailureCount and set anyCommandFailed flag when commands fail
- Implement fail-fast behavior to stop batch execution on first failure when failFast=true
- Update commandResults to use computed callSucceeded value instead of hardcoded true

feat(game_object_create): enhance asset

MCPForUnity/Editor/Tools/BatchExecute.cs

@@ -91,14 +91,28 @@ namespace MCPForUnity.Editor.Tools
                 try
                 {
                     var result = await CommandRegistry.InvokeCommandAsync(toolName, commandParams).ConfigureAwait(true);
+                    bool callSucceeded = DetermineCallSucceeded(result);
+                    if (callSucceeded)
+                    {
                         invocationSuccessCount++;
+                    }
+                    else
+                    {
+                        invocationFailureCount++;
+                        anyCommandFailed = true;
+                    }
 
                     commandResults.Add(new
                     {
                         tool = toolName,
-                        callSucceeded = true,
+                        callSucceeded,
                         result
                     });
+
+                    if (!callSucceeded && failFast)
+                    {
+                        break;
+                    }
                 }
                 catch (Exception ex)
                 {
@@ -134,6 +148,39 @@ namespace MCPForUnity.Editor.Tools
                 : new ErrorResponse("One or more commands failed.", data);
         }
 
+        private static bool DetermineCallSucceeded(object result)
+        {
+            if (result == null)
+            {
+                return true;
+            }
+
+            if (result is IMcpResponse response)
+            {
+                return response.Success;
+            }
+
+            if (result is JObject obj)
+            {
+                var successToken = obj["success"];
+                if (successToken != null && successToken.Type == JTokenType.Boolean)
+                {
+                    return successToken.Value<bool>();
+                }
+            }
+
+            if (result is JToken token)
+            {
+                var successToken = token["success"];
+                if (successToken != null && successToken.Type == JTokenType.Boolean)
+                {
+                    return successToken.Value<bool>();
+                }
+            }
+
+            return true;
+        }
+
         private static JObject NormalizeParameterKeys(JObject source)
         {
             if (source == null)

MCPForUnity/Editor/Tools/GameObjects/GameObjectCreate.cs

@@ -29,9 +29,11 @@ namespace MCPForUnity.Editor.Tools.GameObjects
 
             // --- Try Instantiating Prefab First ---
             string originalPrefabPath = prefabPath;
-            if (!string.IsNullOrEmpty(prefabPath))
+            if (!saveAsPrefab && !string.IsNullOrEmpty(prefabPath))
             {
-                if (!prefabPath.Contains("/") && !prefabPath.EndsWith(".prefab", StringComparison.OrdinalIgnoreCase))
+                string extension = System.IO.Path.GetExtension(prefabPath);
+
+                if (!prefabPath.Contains("/") && (string.IsNullOrEmpty(extension) || extension.Equals(".prefab", StringComparison.OrdinalIgnoreCase)))
                 {
                     string prefabNameOnly = prefabPath;
                     McpLog.Info($"[ManageGameObject.Create] Searching for prefab named: '{prefabNameOnly}'");
@@ -51,11 +53,38 @@ namespace MCPForUnity.Editor.Tools.GameObjects
                         McpLog.Info($"[ManageGameObject.Create] Found unique prefab at path: '{prefabPath}'");
                     }
                 }
-                else if (!prefabPath.EndsWith(".prefab", StringComparison.OrdinalIgnoreCase))
+                else if (prefabPath.Contains("/") && string.IsNullOrEmpty(extension))
                 {
-                    McpLog.Warn($"[ManageGameObject.Create] Provided prefabPath '{prefabPath}' does not end with .prefab. Assuming it's missing and appending.");
+                    McpLog.Warn($"[ManageGameObject.Create] Provided prefabPath '{prefabPath}' has no extension. Assuming it's a prefab and appending .prefab.");
                     prefabPath += ".prefab";
                 }
+                else if (!prefabPath.Contains("/") && !string.IsNullOrEmpty(extension) && !extension.Equals(".prefab", StringComparison.OrdinalIgnoreCase))
+                {
+                    string fileName = prefabPath;
+                    string fileNameWithoutExtension = System.IO.Path.GetFileNameWithoutExtension(fileName);
+                    McpLog.Info($"[ManageGameObject.Create] Searching for asset file named: '{fileName}'");
+
+                    string[] guids = AssetDatabase.FindAssets(fileNameWithoutExtension);
+                    var matches = guids
+                        .Select(g => AssetDatabase.GUIDToAssetPath(g))
+                        .Where(p => p.EndsWith("/" + fileName, StringComparison.OrdinalIgnoreCase) || p.Equals(fileName, StringComparison.OrdinalIgnoreCase))
+                        .ToArray();
+
+                    if (matches.Length == 0)
+                    {
+                        return new ErrorResponse($"Asset file '{fileName}' not found anywhere in the project.");
+                    }
+                    else if (matches.Length > 1)
+                    {
+                        string foundPaths = string.Join(", ", matches);
+                        return new ErrorResponse($"Multiple assets found matching file name '{fileName}': {foundPaths}. Please provide a more specific path.");
+                    }
+                    else
+                    {
+                        prefabPath = matches[0];
+                        McpLog.Info($"[ManageGameObject.Create] Found unique asset at path: '{prefabPath}'");
+                    }
+                }
 
                 GameObject prefabAsset = AssetDatabase.LoadAssetAtPath<GameObject>(prefabPath);
                 if (prefabAsset != null)
@@ -83,7 +112,7 @@ namespace MCPForUnity.Editor.Tools.GameObjects
                 }
                 else
                 {
-                    McpLog.Warn($"[ManageGameObject.Create] Prefab asset not found at path: '{prefabPath}'. Will proceed to create new object if specified.");
+                    return new ErrorResponse($"Asset not found or not a GameObject at path: '{prefabPath}'.");
                 }
             }