Unity UI Toolkit Skills

Unity UI Toolkit Skills

Use this module for Unity UI Toolkit only: UXML for structure, USS for styling, UIDocument for scene attachment, and PanelSettings for runtime rendering.

Requires Unity 2022.3+. Do not mix this module with ui_* UGUI/​Canvas skills. Localization: Match visible UI text to the user's language. Chinese conversation -> Chinese labels/​placeholders/​button text. USS class names and CSS variables stay English.

Operating Mode

• Approval：查询类 skill（uitk_read_file / uitk_find_files / uitk_get_panel_settings / uitk_list_documents / uitk_inspect_uxml / uitk_list_uss_variables / uitk_inspect_document，源码标 SkillMode.SemiAuto）直接执行；其余文件/场景写入类（uitk_create_* / uitk_write_file / uitk_add_* / uitk_modify_element 等，标 SkillMode.FullAuto）需用户 grant，grant 后服务端一步执行返结果。
• Auto / Bypass：未被禁列表拦截的 skill 直接执行。
• 本模块含 Delete 类 skill：uitk_delete_file、uitk_remove_element、uitk_remove_uss_rule 标记为 SkillOperation.Delete，被 IsForbiddenInSemi 静态拦截 —— 仅 Bypass 模式或加入 Allowlist 才能调用。
• Asset 重导行为：所有写文件/删文件 skill 通过 AssetDatabase.ImportAsset(path) 对单个 USS/​UXML 资产单独触发导入，不会调 AssetDatabase.Refresh() 触发全项目扫描；批量创建依次单独 Import。但 USS/​UXML 是 ScriptedImporter 类型，Import 仍会重建依赖此资产的 PanelSettings/​UIDocument 引用，触发 IMGUI 检查器刷新与场景视图重绘。

DO NOT (common hallucinations):

• uitoolkit_create_button / uitoolkit_create_label do not exist -> use uitk_add_element
• uitoolkit_set_style does not exist -> use uitk_add_uss_rule, uitk_remove_uss_rule, or uitk_modify_element
• uitoolkit_create_canvas does not exist -> UI Toolkit uses UIDocument, not Canvas
• uitk_* and ui_* are different systems. Do not mix UI Toolkit structure/​styling assumptions into UGUI workflows
• USS is not full CSS. display:grid, box-shadow, calc(), @media, ::before, z-index, and gradients are unsupported

Routing:

• For UGUI Canvas/​Button/​Text/​Image -> use the ui module
• For XR world-space Canvas conversion -> use xr_setup_ui_canvas
• For generated starter layouts -> use uitk_create_from_template
• For attaching an existing UXML to a scene object -> use uitk_create_document or uitk_set_document

Skills

File Skills

Scene Skills

UXML Structure Skills

USS Style Skills

Template and CodeGen Skills

Supported starter templates include menu, hud, dialog, settings, inventory, list, tab-view, toolbar, card, and notification.

Core Domain Knowledge

USS vs CSS

Common USS workarounds

High-Frequency Parameters

PanelSettings choices

• ScaleWithScreenSize: default for runtime HUD/​menu UI
• ConstantPixelSize: use when strict pixel mapping matters
• ConstantPhysicalSize: rare; only for physically sized UI requirements

Unity 6 world-space flows also need the scene-side document camera setup after configuring PanelSettings.

File and Structure Rules

• Prefer one UXML root that references shared token/​style files through <Style src="..."/>.
• Keep USS next to UXML when possible so relative style references stay short.
• Use uitk_inspect_uxml before complex structural edits if you did not create the file yourself.
• uitk_create_uxml can auto-reference a stylesheet when ussPath is provided.

Workflow Notes

1. Create USS/​UXML first, then attach them through uitk_create_document.
2. Runtime rendering needs a valid PanelSettings asset.
3. When USS and UXML are in the same folder, prefer <Style src="MyStyle.uss" />; use a full asset path only for cross-folder references.
4. Start with design tokens, then component rules, then layout containers.
5. For incremental edits, prefer uitk_read_file -> edit -> uitk_write_file.
6. When creating 2+ files, use uitk_create_batch.
7. Unity 6 world-space rendering uses PanelSettings world-space options plus the scene-side UIDocument camera setup.
8. Use uitk_create_from_template when the user needs a starter screen fast; use uitk_add_element / uitk_add_uss_rule for targeted edits on existing files.

Minimal Example

import unity_skills

unity_skills.call_skill("uitk_create_panel_settings",
    savePath="Assets/​UI/​GamePanel.asset",
    scaleMode="ScaleWithScreenSize",
    referenceResolutionX=1920,
    referenceResolutionY=1080
)

unity_skills.call_skill("uitk_create_uss",
    savePath="Assets/​UI/​HUD.uss",
    content=":root { --accent: #E8632B; } .title { color: var(--accent); }"
)

unity_skills.call_skill("uitk_create_uxml",
    savePath="Assets/​UI/​HUD.uxml",
    content="<?xml version=\"1.0\" encoding=\"utf-8\"?><engine:UXML xmlns:engine=\"UnityEngine.UIElements\"><Style src=\"HUD.uss\" /><engine:Label class=\"title\" text=\"Start\" /></​engine:UXML>"
)

unity_skills.call_skill("uitk_create_document",
    name="HUD",
    uxmlPath="Assets/​UI/​HUD.uxml",
    panelSettingsPath="Assets/​UI/​GamePanel.asset"
)

Exact Signatures

Exact names, parameters, defaults, and returns are defined by GET /​skills/​schema or unity_skills.get_skill_schema(), not by this file. Load USS_REFERENCE.md before generating non-trivial USS systems, layout patterns, component styles, or complete examples.