Revert "[Feature] New UI system (#829)"

This reverts commit 6ab1069.

Author: Scriptwonder

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

@@ -158,7 +158,7 @@ uri="file:///full/path/to/file.cs"
 | **Editor** | `manage_editor`, `execute_menu_item`, `read_console` | Editor control |
 | **Testing** | `run_tests`, `get_test_job` | Unity Test Framework |
 | **Batch** | `batch_execute` | Parallel/bulk operations |
-| **UI** | `manage_ui`, `batch_execute` with `manage_gameobject` + `manage_components` | **UI Toolkit**: Use `manage_ui` to create UXML/USS files, attach UIDocument, inspect visual trees. **uGUI (Canvas)**: Use `batch_execute` for Canvas, Panel, Button, Text, Slider, Toggle, Input Field. **Read `mcpforunity://project/info` first** to detect uGUI/TMP/Input System/UI Toolkit availability. (see [UI workflows](references/workflows.md#ui-creation-workflows)) |
+| **UI** | `batch_execute` with `manage_gameobject` + `manage_components` | Canvas, Panel, Button, Text, Slider, Toggle, Input Field. **Read `mcpforunity://project/info` first** to detect uGUI/TMP/Input System availability. (see [UI workflows](references/workflows.md#ui-creation-workflows)) |
 
 ## Common Workflows
 

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

@@ -12,7 +12,6 @@ Complete reference for all MCP tools. Each tool includes parameters, types, and
 - [Script Tools](#script-tools)
 - [Asset Tools](#asset-tools)
 - [Material & Shader Tools](#material--shader-tools)
-- [UI Tools](#ui-tools)
 - [Editor Control Tools](#editor-control-tools)
 - [Testing Tools](#testing-tools)
 
@@ -36,12 +35,10 @@ Read `mcpforunity://project/info` to detect project capabilities before making a
 | `packages.ugui` | bool | `com.unity.ugui` installed (Canvas, Image, Button, etc.) |
 | `packages.textmeshpro` | bool | `com.unity.textmeshpro` installed (TMP_Text, TMP_InputField) |
 | `packages.inputsystem` | bool | `com.unity.inputsystem` installed (InputAction, PlayerInput) |
-| `packages.uiToolkit` | bool | Always `true` for Unity 2021.3+ (UIDocument, VisualElement, UXML/USS) |
-| `packages.screenCapture` | bool | `com.unity.modules.screencapture` enabled (ScreenCapture API for screenshots) |
 
 **Key decision points:**
 
-- **UI system**: If `packages.uiToolkit` is true (always for Unity 2021+), use `manage_ui` for UI Toolkit workflows (UXML/USS). If `packages.ugui` is true, use Canvas + uGUI components via `batch_execute`. UI Toolkit is preferred for new UI — it uses a frontend-like workflow (UXML for structure, USS for styling).
+- **UI system**: If `packages.ugui` is true, use Canvas + uGUI components. UI Toolkit (UIDocument/UXML) is built-in since Unity 2021+ but has no MCP tool support yet.
 - **Text**: If `packages.textmeshpro` is true, use `TextMeshProUGUI` instead of legacy `Text`.
 - **Input**: Use `activeInputHandler` to decide EventSystem module — `StandaloneInputModule` (Old) vs `InputSystemUIInputModule` (New). See [workflows.md — Input System](workflows.md#input-system-old-vs-new).
 - **Shaders**: Use `renderPipeline` to pick correct shader names — `Standard` (BuiltIn) vs `Universal Render Pipeline/Lit` (URP) vs `HDRP/Lit` (HDRP).
@@ -586,76 +583,6 @@ manage_texture(
 
 ---
 
-## UI Tools
-
-### manage_ui
-
-Manage Unity UI Toolkit elements: UXML documents, USS stylesheets, UIDocument components, and visual tree inspection.
-
-```python
-# Create a UXML file
-manage_ui(
-    action="create",
-    path="Assets/UI/MainMenu.uxml",
-    contents='<ui:UXML xmlns:ui="UnityEngine.UIElements"><ui:Label text="Hello" /></ui:UXML>'
-)
-
-# Create a USS stylesheet
-manage_ui(
-    action="create",
-    path="Assets/UI/Styles.uss",
-    contents=".title { font-size: 32px; color: white; }"
-)
-
-# Read a UXML/USS file
-manage_ui(
-    action="read",
-    path="Assets/UI/MainMenu.uxml"
-)
-# Returns: {"success": true, "data": {"contents": "...", "path": "..."}}
-
-# Update an existing file
-manage_ui(
-    action="update",
-    path="Assets/UI/Styles.uss",
-    contents=".title { font-size: 48px; color: yellow; -unity-font-style: bold; }"
-)
-
-# Attach UIDocument to a GameObject
-manage_ui(
-    action="attach_ui_document",
-    target="UICanvas",                    # GameObject name or path
-    source_asset="Assets/UI/MainMenu.uxml",
-    panel_settings="Assets/UI/Panel.asset",  # optional, auto-creates if omitted
-    sort_order=0                          # optional, default 0
-)
-
-# Create PanelSettings asset
-manage_ui(
-    action="create_panel_settings",
-    path="Assets/UI/Panel.asset",
-    scale_mode="ScaleWithScreenSize",     # optional: "ConstantPixelSize"|"ConstantPhysicalSize"|"ScaleWithScreenSize"
-    reference_resolution={"width": 1920, "height": 1080}  # optional, for ScaleWithScreenSize
-)
-
-# Inspect the visual tree of a UIDocument
-manage_ui(
-    action="get_visual_tree",
-    target="UICanvas",                    # GameObject with UIDocument
-    max_depth=10                          # optional, default 10
-)
-# Returns: hierarchy of VisualElements with type, name, classes, styles, text, children
-```
-
-**UI Toolkit workflow:**
-
-1. Create UXML (structure, like HTML) and USS (styling, like CSS) files
-2. Create a PanelSettings asset (or let `attach_ui_document` auto-create one)
-3. Create an empty GameObject and attach UIDocument with the UXML source
-4. Use `get_visual_tree` to inspect the result
-
----
-
 ## Editor Control Tools
 
 ### manage_editor

.claude/skills/unity-mcp-skill/references/workflows.md

@@ -561,7 +561,7 @@ manage_scene(action="screenshot")
 
 ## UI Creation Workflows
 
-Unity has two UI systems: **UI Toolkit** (modern, recommended) and **uGUI** (Canvas-based, legacy). Use `manage_ui` for UI Toolkit workflows, and `batch_execute` with `manage_gameobject` + `manage_components` for uGUI.
+Unity UI (Canvas-based UGUI) requires specific component hierarchies. Use `batch_execute` with `fail_fast=True` to create complete UI elements in a single call.
 
 > **Template warning:** This section is a skill template library, not a guaranteed source of truth. Examples may be inaccurate for your Unity version, package setup, or project conventions.
 > **Use safely:**
@@ -582,9 +582,7 @@ Unity has two UI systems: **UI Toolkit** (modern, recommended) and **uGUI** (Can
 #   "packages": {
 #     "ugui": true/false,        — com.unity.ugui (Canvas, Image, Button, etc.)
 #     "textmeshpro": true/false,  — com.unity.textmeshpro (TextMeshProUGUI)
-#     "inputsystem": true/false,  — com.unity.inputsystem (new Input System)
-#     "uiToolkit": true/false,    — UI Toolkit (always true for Unity 2021.3+)
-#     "screenCapture": true/false  — ScreenCapture module enabled
+#     "inputsystem": true/false   — com.unity.inputsystem (new Input System)
 #   }
 # }
 ```
@@ -593,116 +591,13 @@ Unity has two UI systems: **UI Toolkit** (modern, recommended) and **uGUI** (Can
 
 | project_info field | Value | What to use |
 |---|---|---|
-| `packages.uiToolkit` | `true` | **Preferred:** Use `manage_ui` for UI Toolkit (UXML/USS) |
-| `packages.ugui` | `true` | Canvas-based UI (Image, Button, etc.) via `batch_execute` |
-| `packages.textmeshpro` | `true` | `TextMeshProUGUI` for text (uGUI) |
+| `packages.ugui` | `true` | Canvas-based UI (Image, Button, etc.) |
+| `packages.textmeshpro` | `true` | `TextMeshProUGUI` for text |
 | `packages.textmeshpro` | `false` | `UnityEngine.UI.Text` (legacy, lower quality) |
-| `activeInputHandler` | `"Old"` | `StandaloneInputModule` for EventSystem (uGUI) |
-| `activeInputHandler` | `"New"` | `InputSystemUIInputModule` for EventSystem (uGUI) |
+| `activeInputHandler` | `"Old"` | `StandaloneInputModule` for EventSystem |
+| `activeInputHandler` | `"New"` | `InputSystemUIInputModule` for EventSystem |
 | `activeInputHandler` | `"Both"` | Either works; prefer `InputSystemUIInputModule` for UI |
 
-### UI Toolkit Workflows (manage_ui)
-
-UI Toolkit uses a web-like approach: **UXML** (like HTML) for structure, **USS** (like CSS) for styling. This is the preferred UI system for new projects.
-
-#### Create a Complete UI Screen
-
-```python
-# 1. Create UXML document (structure)
-manage_ui(
-    action="create",
-    path="Assets/UI/MainMenu.uxml",
-    contents='''<ui:UXML xmlns:ui="UnityEngine.UIElements" xmlns:uie="UnityEditor.UIElements">
-    <ui:Style src="Assets/UI/MainMenu.uss" />
-    <ui:VisualElement name="root" class="root-container">
-        <ui:Label text="My Game" class="title" />
-        <ui:Button text="Play" name="play-btn" class="menu-button" />
-        <ui:Button text="Settings" name="settings-btn" class="menu-button" />
-        <ui:Button text="Quit" name="quit-btn" class="menu-button" />
-    </ui:VisualElement>
-</ui:UXML>'''
-)
-
-# 2. Create USS stylesheet (styling)
-manage_ui(
-    action="create",
-    path="Assets/UI/MainMenu.uss",
-    contents='''.root-container {
-    flex-grow: 1;
-    justify-content: center;
-    align-items: center;
-    background-color: rgba(0, 0, 0, 0.8);
-}
-.title {
-    font-size: 48px;
-    color: white;
-    -unity-font-style: bold;
-    margin-bottom: 40px;
-}
-.menu-button {
-    width: 300px;
-    height: 60px;
-    font-size: 24px;
-    margin: 8px;
-    background-color: rgb(50, 120, 200);
-    color: white;
-    border-radius: 8px;
-}
-.menu-button:hover {
-    background-color: rgb(70, 140, 220);
-}'''
-)
-
-# 3. Create a GameObject and attach UIDocument
-manage_gameobject(action="create", name="UIRoot")
-manage_ui(
-    action="attach_ui_document",
-    target="UIRoot",
-    source_asset="Assets/UI/MainMenu.uxml"
-    # panel_settings auto-created if omitted
-)
-
-# 4. Verify the visual tree
-manage_ui(action="get_visual_tree", target="UIRoot", max_depth=5)
-```
-
-#### Update Existing UI
-
-```python
-# Read current content
-result = manage_ui(action="read", path="Assets/UI/MainMenu.uss")
-# Modify and update
-manage_ui(
-    action="update",
-    path="Assets/UI/MainMenu.uss",
-    contents=".title { font-size: 64px; color: yellow; }"
-)
-```
-
-#### Custom PanelSettings
-
-```python
-# Create PanelSettings with ScaleWithScreenSize
-manage_ui(
-    action="create_panel_settings",
-    path="Assets/UI/GamePanelSettings.asset",
-    scale_mode="ScaleWithScreenSize",
-    reference_resolution={"width": 1920, "height": 1080}
-)
-
-# Attach UIDocument with custom PanelSettings
-manage_ui(
-    action="attach_ui_document",
-    target="UIRoot",
-    source_asset="Assets/UI/MainMenu.uxml",
-    panel_settings="Assets/UI/GamePanelSettings.asset"
-)
-```
-
-### uGUI (Canvas-Based) Workflows
-
-The sections below cover legacy Canvas-based UI using `batch_execute`. Use these when working with existing uGUI projects or when UI Toolkit is not suitable.
-
 ### RectTransform Sizing (Critical for All UI Children)
 
 Every GameObject under a Canvas gets a `RectTransform` instead of `Transform`. **Without setting anchor/size, UI elements default to zero size and won't be visible.** Use `set_property` on `RectTransform`:

MCPForUnity/Editor/Resources/Project/ProjectInfo.cs

@@ -37,8 +37,6 @@ public static object HandleCommand(JObject @params)
                         ugui = IsPackageInstalled("com.unity.ugui"),
                         textmeshpro = IsPackageInstalled("com.unity.textmeshpro"),
                         inputsystem = IsPackageInstalled("com.unity.inputsystem"),
-                        uiToolkit = true,
-                        screenCapture = MCPForUnity.Runtime.Helpers.ScreenshotUtility.IsScreenCaptureModuleAvailable,
                     }
                 };