chore: bump version to 9.6.2

.claude/skills/unity-mcp-skill/SKILL.md

@@ -178,11 +178,11 @@ uri="file:///full/path/to/file.cs"
 
 | Category | Key Tools | Use For |
 |----------|-----------|---------|
-| **Scene** | `manage_scene`, `find_gameobjects` | Scene operations, finding objects |
+| **Scene** | `manage_scene`, `find_gameobjects` | Scene operations, finding objects. Multi-scene editing (additive load, close, set active, move GO between scenes), scene templates (`3d_basic`, `2d_basic`, `empty`, `default`), scene validation with `auto_repair`. For build settings, use `manage_build(action="scenes")`. |
 | **Objects** | `manage_gameobject`, `manage_components` | Creating/modifying GameObjects |
 | **Scripts** | `create_script`, `script_apply_edits`, `validate_script` | C# code management (auto-refreshes on create/edit) |
 | **Assets** | `manage_asset`, `manage_prefabs` | Asset operations. **Prefab instantiation** is done via `manage_gameobject(action="create", prefab_path="...")`, not `manage_prefabs`. |
-| **Editor** | `manage_editor`, `execute_menu_item`, `read_console` | Editor control, package deployment (`deploy_package`/`restore_package` actions) |
+| **Editor** | `manage_editor`, `execute_menu_item`, `read_console` | Editor control, package deployment (`deploy_package`/`restore_package`), undo/redo (`undo`/`redo` actions) |
 | **Testing** | `run_tests`, `get_test_job` | Unity Test Framework |
 | **Batch** | `batch_execute` | Parallel/bulk operations |
 | **Camera** | `manage_camera` | Camera management (Unity Camera + Cinemachine). **Tier 1** (always available): create, target, lens, priority, list, screenshot. **Tier 2** (requires `com.unity.cinemachine`): brain, body/aim/noise pipeline, extensions, blending, force/release. 7 presets: follow, third_person, freelook, dolly, static, top_down, side_scroller. Resource: `mcpforunity://scene/cameras`. Use `ping` to check Cinemachine availability. See [tools-reference.md](references/tools-reference.md#camera-tools). |

.claude/skills/unity-mcp-skill/references/tools-reference.md

@@ -175,6 +175,26 @@ manage_scene(action="get_build_settings") # Build settings
 manage_scene(action="create", name="NewScene", path="Assets/Scenes/")
 manage_scene(action="load", path="Assets/Scenes/Main.unity")
 manage_scene(action="save")
+
+# Scene templates — create with preset objects
+manage_scene(action="create", name="Level1", template="3d_basic")   # Camera + Light + Ground
+manage_scene(action="create", name="Level2", template="2d_basic")   # Camera (ortho) + Light
+manage_scene(action="create", name="Empty", template="empty")       # No default objects
+manage_scene(action="create", name="Default", template="default")   # Camera + Light (Unity default)
+
+# Multi-scene editing
+manage_scene(action="load", path="Assets/Scenes/Level2.unity", additive=True)  # Keep current scene
+manage_scene(action="get_loaded_scenes")                            # List all loaded scenes
+manage_scene(action="set_active_scene", scene_name="Level2")        # Set active scene
+manage_scene(action="close_scene", scene_name="Level2")             # Unload scene
+manage_scene(action="close_scene", scene_name="Level2", remove_scene=True)  # Fully remove
+manage_scene(action="move_to_scene", target="Player", scene_name="Level2")  # Move root GO
+
+# Build settings — use manage_build(action="scenes") instead
+
+# Scene validation
+manage_scene(action="validate")                    # Detect missing scripts, broken prefabs
+manage_scene(action="validate", auto_repair=True)  # Also auto-fix missing scripts (undoable)
 ```
 
 ### find_gameobjects
@@ -332,6 +352,11 @@ manage_components(
 # - "Assets/Prefabs/My.prefab" → String shorthand for asset paths
 # - "ObjectName"               → String shorthand for scene name lookup
 # - 12345                      → Integer shorthand for instanceID
+#
+# Sprite sub-asset references (for SpriteRenderer.sprite, Image.sprite, etc.):
+# - {"guid": "...", "spriteName": "SubSprite"}  → Sprite sub-asset from atlas
+# - {"guid": "...", "fileID": 12345}             → Sub-asset by fileID
+# Single-sprite textures auto-resolve from guid/path alone.
 ```
 
 ---
@@ -523,6 +548,24 @@ manage_prefabs(
     position=[0, 1, 0],
     components_to_add=["AudioSource"]
 )
+
+# Add child GameObjects to a prefab (single or batch)
+manage_prefabs(
+    action="modify_contents",
+    prefab_path="Assets/Prefabs/Player.prefab",
+    create_child=[
+        {"name": "Child1", "primitive_type": "Sphere", "position": [1, 0, 0]},
+        {"name": "Child2", "primitive_type": "Cube", "parent": "Child1"}
+    ]
+)
+
+# Add a nested prefab instance inside a prefab
+manage_prefabs(
+    action="modify_contents",
+    prefab_path="Assets/Prefabs/Player.prefab",
+    create_child={"name": "Bullet", "source_prefab_path": "Assets/Prefabs/Bullet.prefab", "position": [0, 2, 0]}
+)
+# source_prefab_path and primitive_type are mutually exclusive
 ```
 
 ---
@@ -691,7 +734,7 @@ manage_ui(
 
 ### manage_editor
 
-Control Unity Editor state.
+Control Unity Editor state, undo/redo.
 
 ```python
 manage_editor(action="play")               # Enter play mode
@@ -708,6 +751,10 @@ manage_editor(action="remove_layer", layer_name="OldLayer")
 
 manage_editor(action="close_prefab_stage")  # Exit prefab editing mode back to main scene
 
+# Undo/Redo — returns the affected undo group name
+manage_editor(action="undo")               # Undo last action
+manage_editor(action="redo")               # Redo last undone action
+
 # Package deployment (no confirmation dialog — designed for LLM-driven iteration)
 manage_editor(action="deploy_package")     # Copy configured MCPForUnity source into installed package
 manage_editor(action="restore_package")    # Revert to pre-deployment backup

.gitignore

@@ -12,6 +12,7 @@
 __pycache__/
 __pycache__.meta
 build/
+!MCPForUnity/**/Build/
 dist/
 wheels/
 *.egg-info

MCPForUnity/Editor/Helpers/ComponentOps.cs

@@ -592,7 +592,7 @@ private static bool SetSerializedPropertyRecursive(SerializedProperty prop, JTok
             }
         }
 
-        private static bool SetObjectReference(SerializedProperty prop, JToken value, out string error)
+        internal static bool SetObjectReference(SerializedProperty prop, JToken value, out string error)
         {
             error = null;
 
@@ -647,12 +647,18 @@ private static bool SetObjectReference(SerializedProperty prop, JToken value, ou
                     {
                         string spriteName = spriteNameToken.ToString();
                         var allAssets = AssetDatabase.LoadAllAssetsAtPath(path);
+                        var originalRef = prop.objectReferenceValue;
                         foreach (var asset in allAssets)
                         {
                             if (asset is Sprite sprite && sprite.name == spriteName)
                             {
                                 prop.objectReferenceValue = sprite;
-                                return true;
+                                if (prop.objectReferenceValue != null)
+                                    return true;
+                                // Unity rejected the type — restore and report
+                                prop.objectReferenceValue = originalRef;
+                                error = $"Sprite '{spriteName}' found but is not compatible with the property type.";
+                                return false;
                             }
                         }
 
@@ -667,6 +673,7 @@ private static bool SetObjectReference(SerializedProperty prop, JToken value, ou
                         if (targetFileId != 0)
                         {
                             var allAssets = AssetDatabase.LoadAllAssetsAtPath(path);
+                            var originalRef = prop.objectReferenceValue;
                             foreach (var asset in allAssets)
                             {
                                 if (asset is Sprite sprite)
@@ -675,7 +682,11 @@ private static bool SetObjectReference(SerializedProperty prop, JToken value, ou
                                     if (spriteFileId == targetFileId)
                                     {
                                         prop.objectReferenceValue = sprite;
-                                        return true;
+                                        if (prop.objectReferenceValue != null)
+                                            return true;
+                                        prop.objectReferenceValue = originalRef;
+                                        error = $"Sprite with fileID '{targetFileId}' found but is not compatible with the property type.";
+                                        return false;
                                     }
                                 }
                             }
@@ -785,6 +796,43 @@ private static bool AssignObjectReference(SerializedProperty prop, UnityEngine.O
             if (prop.objectReferenceValue != null)
                 return true;
 
+            // Sub-asset fallback: e.g., Texture2D → Sprite
+            string subAssetPath = AssetDatabase.GetAssetPath(resolved);
+            if (!string.IsNullOrEmpty(subAssetPath))
+            {
+                var subAssets = AssetDatabase.LoadAllAssetsAtPath(subAssetPath);
+                UnityEngine.Object match = null;
+                int matchCount = 0;
+                foreach (var sub in subAssets)
+                {
+                    if (sub == null || sub == resolved) continue;
+                    prop.objectReferenceValue = sub;
+                    if (prop.objectReferenceValue != null)
+                    {
+                        match = sub;
+                        matchCount++;
+                        if (matchCount > 1) break;
+                    }
+                }
+
+                if (matchCount == 1)
+                {
+                    prop.objectReferenceValue = match;
+                    return true;
+                }
+
+                // Clean up: probing may have left the property dirty
+                prop.objectReferenceValue = null;
+
+                if (matchCount > 1)
+                {
+                    error = $"Multiple compatible sub-assets found in '{subAssetPath}'. " +
+                            "Use {\"guid\": \"...\", \"spriteName\": \"<name>\"} or " +
+                            "{\"guid\": \"...\", \"fileID\": <id>} for precise selection.";
+                    return false;
+                }
+            }
+
             // If the resolved object is a GameObject but the property expects a Component,
             // try each component on the GameObject until one is accepted.
             if (resolved is GameObject go)

MCPForUnity/Editor/Services/IToolDiscoveryService.cs

@@ -17,6 +17,7 @@ public class ToolMetadata
         public bool AutoRegister { get; set; } = true;
         public bool RequiresPolling { get; set; } = false;
         public string PollAction { get; set; } = "status";
+        public int MaxPollSeconds { get; set; } = 0;
         public bool IsBuiltIn { get; set; }
         public string Group { get; set; } = "core";
     }

MCPForUnity/Editor/Services/ToolDiscoveryService.cs

@@ -133,6 +133,7 @@ private ToolMetadata ExtractToolMetadata(Type type, McpForUnityToolAttribute too
                     AutoRegister = toolAttr.AutoRegister,
                     RequiresPolling = toolAttr.RequiresPolling,
                     PollAction = string.IsNullOrEmpty(toolAttr.PollAction) ? "status" : toolAttr.PollAction,
+                    MaxPollSeconds = toolAttr.MaxPollSeconds,
                     Group = toolAttr.Group ?? "core"
                 };
 

MCPForUnity/Editor/Services/Transport/Transports/WebSocketTransportClient.cs

@@ -541,6 +541,7 @@ private async Task SendRegisterToolsAsync(CancellationToken token)
                     ["structured_output"] = tool.StructuredOutput,
                     ["requires_polling"] = tool.RequiresPolling,
                     ["poll_action"] = tool.PollAction,
+                    ["max_poll_seconds"] = tool.MaxPollSeconds,
                     ["group"] = string.IsNullOrWhiteSpace(tool.Group) ? "core" : tool.Group
                 };