🎮 UnitySkills

The current official maintenance baseline is Unity 2022.3+. Some Unity 2021 compatibility logic may still remain in the codebase, but future feature work, regression testing, and adaptation will focus on 2022.3+ / Unity 6.

📈 Project Contribution Rankings

🤝 Acknowledgments

This project is a deep refactoring and feature extension based on the excellent concept of unity-mcp.

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🚀 Core Features

• 🛠️ 784 REST Skills Comprehensive Toolkit: Includes 54 functional source modules plus 24 advisory design modules, with Batch operations for multi-object control.
• ⚡ Revolutionary Efficiency Boost (v2.0.1+): Schema caching + exponential backoff polling + BATCH-FIRST guidance → Token consumption ↓ 96%, simple tasks 4-6 calls → 1 call (↓ 75-83%). Current: v2.4.3.
• 🔐 Three-Tier Permission Modes (v1.9.0+): Approval / Auto / Bypass with dual approval channels (Dialog / Panel), aligned with Claude Code permission modes; zero-impact upgrade for existing users.
• 🤖 5 Major IDEs Native Support: Claude Code / Antigravity / Codex / Cursor / OpenCode — one-click install and use.
• 🛡️ Transactional Atomicity: Failed operations auto-rollback, leaving scenes clean and safe.
• 🌍 Multi-Instance Simultaneous Control: Automatic port discovery and global registry for controlling multiple Unity projects at once.
• 🔗 Ultra-Stable Long Connections: Configurable request timeout (default 15 minutes), automatic recovery after Domain Reload, with retry hints during script compilation/asset updates.
• 🛡️ Anti-Hallucination Guardrails: Each Skill module includes DO NOT lists and routing rules to prevent calls to nonexistent commands or parameter errors.

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🛡️ Built for Trust: The Governance Layer

An AI driving the Editor writes to real scenes, prefabs and .meta files. The interesting question isn't whether it can — it's what happens when it gets something wrong. UnitySkills answers that at four points in the call lifecycle.

• Before execution — ?mode=dryRun / ?mode=plan: POST /skill/{name}?mode=dryRun writes nothing and returns parameter validation (missingParams / unknownParams / typeErrors / semanticErrors / warnings) plus an impact estimate (mutatesScene / mutatesAssets / mayTriggerReload / mayEnterPlayMode / riskLevel). Skills with a semantic planner also return steps / changes.
• At execution — per-operation risk gating: every skill declares RiskLevel / Operation / MayEnterPlayMode / MayTriggerReload in its [UnitySkill] metadata, and the server derives NeverInSemi from that metadata — gating never depends on the AI behaving well. Allowlist grants a persistent pass to individual skills; the optional ConfirmationToken handshake (off by default — ⚙ Settings → Runtime → Require Confirmation) adds one more gate on high-risk skills.
• After execution — JSONL audit trail: every call, grant, revoke and blocked hit is appended to Library/UnitySkillsAudit.jsonl (1 MB rotation, primary + 3 historical files), browsable and filterable in the panel. Deleting audit entries is itself recorded, as audit_deleted / audit_cleared.
• After a mistake — typed, persistent snapshot rollback: Workflow snapshots are typed (Modified / Created / Deleted / Moved / Setting), and the asset file and its .meta are content-addressed independently (fileHash / metaFileHash) under Library/UnitySkills/, so history survives Domain Reloads and editor restarts. workflow_undo_task rolls back one task, not the whole project.
• Batch as a transaction: POST /skills/batch supports fail-fast or continueOnError, cross-step $ref to reuse an earlier step's output, rollback on failure, and ?diff=1 for the aggregated net change.

How this compares

Dimension	UnitySkills	Typical MCP bridge	Unity's official AI Assistant
Permission granularity	Per-operation: three modes (Approval / Auto / Bypass) + risk metadata on every skill + per-skill Allowlist	No permission model — once connected, the whole tool surface is callable	Per-client trust (Pending Connections → Allow / Revoke); after approval, calls are not distinguished by operation
Audit	Structured JSONL for every call / grant / revoke / block, browsable in-panel; deletions are audited too	Process logs only; no structured per-call record	Surfaced as chat history and checkpoints rather than a per-operation audit record
Rollback granularity	Per-task, five snapshot types, file and .meta content-addressed, persists across sessions	Relies on Unity's native Undo stack; not guaranteed to survive a Domain Reload	Project-wide checkpoints taken per prompt — restoring rewinds the entire project to that point
Pre-execution preview	?mode=dryRun / ?mode=plan — semantic parameter validation + impact estimate, nothing written	No equivalent found	No pre-execution parameter validation or impact preview found
Batch transactions	POST /skills/batch — fail-fast / continueOnError, cross-step $ref, rollback, ?diff=1 net change	Per-call tool invocations, no transaction semantics	Not exposed as a batch transaction

The UnitySkills column describes mechanisms that exist in this repository and can be checked against the source or by calling the endpoints. The other two columns reflect public material and open-source repositories surveyed in 2026-07; they characterise a class of tooling rather than any specific project, and those capabilities may have changed since.

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🔐 Operating Modes (v1.9.0+)

UnitySkills ships with a true server-side permission system aligned with Claude Code permission modes. All mode switching happens in the Unity panel — open Window > UnitySkills, click the ⚙ (Settings) button, and use the Server section — chat trigger words are no longer supported.

Mode	Default	Behavior	Use Case
Approval	—	AI must request → user approves → execute (returns MODE_RESTRICTED + grant token)	Manual control, sensitive projects
Auto	New installs	AI runs FullAuto skills directly; server only blocks auto-detected high-risk ops (NeverInSemi)	Day-to-day development
Bypass	Existing installs (upgrade)	All skills run unrestricted; only ConfirmationToken gate remains for high-risk ops	Automation, CI, fast iteration

Two approval channels under Approval mode:

• Dialog (default) — AI explains intent + grant token, user agrees in chat, AI replays the token via POST /permission/grant
• Panel (opt-in) — grant token only takes effect after user clicks [Approve] in the Unity panel; AI-issued grants without panel approval return GRANT_PENDING_APPROVAL

Zero-impact upgrade for existing users: the plugin detects legacy UnitySkills_* EditorPrefs keys and keeps Bypass as the default, preserving the previous Full-Auto behavior with no action required. New installations default to Auto — FullAuto skills run directly, only NeverInSemi (Delete / MayEnterPlayMode / MayTriggerReload / high-risk) operations are blocked. Switch to Approval from the ⚙ Settings drawer's Server section if you need per-skill manual gating.

❌ Chat trigger words (e.g. "full auto" / "semi-auto") are no longer recognized. Switch modes via the ⚙ Settings button in Window > UnitySkills.

📜 Audit log: Library/UnitySkillsAudit.jsonl (per-project, jsonl, auto-rolls at 1MB, keeps 3 files) records every grant / revoke / restricted hit / call. Open it from the ⚙ Settings drawer → View Audit Log (or press Alt+Shift+L) to browse, filter, delete individual entries (✕), or wipe everything (🗑 Clear All) — deletions themselves are appended as audit_deleted / audit_cleared events so the log stays auditable.

🗑 The Skill Installer card shows a per-scope uninstall button that auto-adapts: disabled when nothing's installed, a single button labeled with its scope when only one is installed, and a dropdown (Uninstall ▾) listing Project / Global when both are installed.

24 advisory design modules (architecture, performance, design patterns, testability, package-specific source rules, etc.) are available in all modes and loaded on demand.

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🏗️ Quick Install Supported IDE/Terminals

This project has been deeply optimized for the following environments to ensure a continuous and stable development experience (tools not listed below are not necessarily unsupported — they just lack a quick installer; use Custom Installation to the corresponding directory):

AI Terminal	Support Status	Special Features
Antigravity	✅ Supported	Open Agent Skills standard via .agents/skills/ (workspace) and ~/.gemini/antigravity/skills/ (global).
Claude Code	✅ Supported	Intelligent Skill intent recognition, supports complex multi-step automation.
Codex	✅ Supported	Supports $skill explicit invocation and implicit intent recognition. Shares .agents/skills/ with Antigravity in workspace mode.
Cursor	✅ Supported	Auto-discovers .cursor/skills/ and .agents/skills/; supports /skill-name explicit invocation; visible in Settings → Rules.
OpenCode	✅ Supported	Native .opencode/skills/ workspace and ~/.config/opencode/skills/ global discovery.

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🏁 Quick Start

Overview: Install Unity Plugin → Start UnitySkills Server → AI Uses Skills

1. Install Unity Plugin

Add via Unity Package Manager using Git URL:

Stable Version (main):

https://github.com/Besty0728/Unity-Skills.git?path=/SkillsForUnity

Beta Version (beta):

https://github.com/Besty0728/Unity-Skills.git?path=/SkillsForUnity#beta

Specific Version (e.g., v1.6.0):

https://github.com/Besty0728/Unity-Skills.git?path=/SkillsForUnity#v1.6.0

📦 All version packages are available on the Releases page

2. Open the Panel & Start Server

In Unity, open menu: Window > UnitySkills (or press Alt+Shift+U). Use the server toggle switch in the top bar to start it; once started it auto-restarts across domain reloads.

⏳ script_*, debug_force_recompile, debug_set_defines, some asset reimports, and package changes may trigger compilation or Domain Reload. Temporary REST unavailability during that window is expected; wait a moment and retry.

3. One-Click AI Skills Configuration

1. Open Window > UnitySkills and go to the AI Config tab.
2. Select the corresponding terminal icon (Claude / Antigravity / Codex / Cursor / OpenCode).
3. Click "Install" to complete the environment configuration without manual code copying.

The installer copies the unity-skills~/ template directory from the package to the target location.

Installer output files (generated in target directory):

• SKILL.md
• skills/
• references/
• scripts/unity_skills.py
• scripts/agent_config.json (contains Agent identifier)

Codex Note: Antigravity and Codex share .agents/skills/ in workspace mode — installing once for either makes the skill available to both. Codex auto-discovers skills in .agents/skills/; no AGENTS.md declaration needed.

📘 For complete installation and usage instructions, see: Setup Guide | 安装指南

If one-click installation is not supported or preferred, follow this standard procedure for manual deployment (applicable to all tools supporting Skills):

✅ Standard Installation Method A

1. Custom Installation: In the installation interface, select the "Custom Path" option to install Skills to any directory you specify (e.g., Assets/MyTools/AI) for easier project management.

✅ Standard Installation Method B

1. Locate Skills Source Directory: The SkillsForUnity/unity-skills~/ directory in the UPM package is the distributable Skills template (root directory contains SKILL.md).
2. Find the Tool's Skills Root Directory: Different tools have different paths; refer to the tool's documentation first.
3. Copy Completely: Copy the entire contents of unity-skills~/ to the tool's Skills root directory (rename to unity-skills/).
4. Create agent_config.json: Create an agent_config.json file in the unity-skills/scripts/ directory:

   {"agentId": "your-agent-name", "installedAt": "2026-02-11T00:00:00Z"}
   

   Replace your-agent-name with the name of your AI tool (e.g., claude-code, antigravity, codex, cursor).
5. Directory Structure Requirements: After copying, maintain the structure as follows (example):
   • unity-skills/SKILL.md
   • unity-skills/skills/
   • unity-skills/references/
   • unity-skills/scripts/unity_skills.py
   • unity-skills/scripts/agent_config.json
6. Restart the Tool: Let the tool reload the Skills list.
7. Verify Loading: Trigger the Skills list/command in the tool (or execute a simple skill call) to confirm availability.

🔎 Common Tool Directory Reference

The following are verified default directories (if the tool has a custom path configured, use that instead):

• Claude Code: ~/.claude/skills/
• Antigravity: ~/.gemini/antigravity/skills/ (global) or .agents/skills/ (workspace)
• OpenAI Codex: ~/.agents/skills/ (global) or .agents/skills/ (workspace, shared with Antigravity)
• Cursor: ~/.cursor/skills/ (global) or .cursor/skills/ (workspace); also auto-discovers .agents/skills/
• OpenCode: ~/.config/opencode/skills/ (global) or .opencode/skills/ (workspace)

🧩 Other Tools Supporting Skills

If you're using other tools that support Skills, install according to the Skills root directory specified in that tool's documentation. As long as the standard installation specification is met (root directory contains SKILL.md and maintains skills/, references/, and scripts/ structure), it will be correctly recognized.

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Category	Count	Core Functions
YooAsset	40	Hot-update bundle builds/Collector full CRUD/BuildReport asset and dependency analysis/PlayMode runtime validation/Reporter-Debugger-AssetArtScanner tools
Behavior	10	Unity Behavior graph assets/agents/blackboard variables (com.unity.behavior, reflection-based)
HybridCLR	12	HybridCLR hot-update settings/codegen/DLL compile & copy pipeline (com.code-philosophy.hybridclr, reflection-based)
Workflow	40	Persistent history/Tiered task snapshots/Content-addressed file store/Auto-clean/Session-level undo/Rollback/Clear history/Bookmarks/Batch query-preview-execute jobs
Cinemachine	34	2.x/3.x dual version auto-install/MixingCamera/ClearShot/TargetGroup/Spline
Netcode	39	Netcode for GameObjects setup/prefabs/lifecycle/host-server-client workflows/NGO 2.5+ attachable & component-controller helpers
UI	29	Canvas/Button/Text/InputField/Dropdown/ScrollView/Layout/Alignment/Image and selectable utilities
UI Toolkit	31	UXML/USS file management/UIDocument/PanelSettings full property read-write/Template generation/Structure inspection/Batch create/Runtime data binding/UXML upgrade/World-space panels
ShaderGraph	23	Shader Graph create/inspect/blackboard edit/constrained node editing
ProBuilder	22	ProBuilder shape creation/face-edge operations/UV tools/pivot edits/batch creation/mesh combination
XR	22	XR rig setup/interactors/interactables/teleportation/continuous move/UI/haptics/interaction layers
Material	21	Batch material property modification/HDR/PBR/Emission/Keywords/Render queue
PostProcess	10	SRP post-processing effect management
GameObject	19	Create/Find/Transform sync/Batch operations/Hierarchy management/Rename/Duplicate
Perception	18	Scene summary/health checks/stack detection/context export/dependency analysis/hotspots/diff/tag-layer stats/performance hints
Volume	9	VolumeProfile/Volume/VolumeComponent creation and parameter editing
Validation	16	Project validation/Empty folder cleanup/Reference detection/Mesh collider/Shader errors
URP	7	URP asset/renderer/renderer feature inspection and edits
Decal	7	URP Decal Projector create/inspect/configure/delete workflows
DOTween	21	DOTweenAnimation editor-time setup and tuning
PrimeTween	5	PrimeTween Free inspection, factory discovery, and runtime tween/sequence script generation
Editor	16	Play mode runtime capture/Frame stepping/Live state inspect/Selection/Undo-Redo/Context retrieval/Change journal/Menu execution
Physics	12	Raycast/SphereCast/BoxCast/Physics materials/Layer collision matrix
Script	12	C# script create/Read/Replace/List/Info/Rename/Move/Analyze
Timeline	12	Track create/Delete/Clip management/Playback control/Binding/Duration
Asset	12	Asset import/Delete/Move/Copy/Search/Folders/Batch folder creation/Batch operations/Refresh
AssetImport	11	Texture/Model/Audio/Sprite import settings/Label management/Reimport
Camera	12	Scene View control/Game Camera create/Properties/Screenshot/Orthographic toggle/List
Graphics	11	GraphicsSettings/QualitySettings/SRP asset operations
Package	11	Package management/Install/Remove/Search/Versions/Dependencies/Cinemachine/Splines
Prefab	11	Create/Instantiate/Override apply & revert/Batch instantiate/Variants/Find instances/Asset property editing
Shader	11	Shader create/URP templates/Compile check/Keywords/Variant analysis/Global keywords
Test	13	Test run/Run by name/Categories/Template create/Summary statistics
Animator	10	Animation controller/Parameters/State machine/Transitions/Assign/Play
Audio	10	Audio import settings/AudioSource/AudioClip/AudioMixer/Batch
Cleaner	10	Unused assets/Duplicate files/Empty folders/Missing script fix/Dependency tree
Component	14	Add/Remove/Property config/Batch operations/Copy/Enable-Disable
Console	10	Log capture/Clear/Export/Statistics/Pause control/Collapse/Clear on play
Debug	11	Error logs/Compile check/Stack trace/Assemblies/Define symbols/Memory info/Editor health diagnose
Event	11	UnityEvent listener management/Batch add/Copy/State control/List
Light	10	Light create/Type config/Intensity-Color/Batch toggle/Probe groups/Reflection probes/Lightmaps
Model	10	Model import settings/Mesh info/Material mapping/Animation/Skeleton/Batch
NavMesh	10	Bake/Path calculation/Agent/Obstacle/Sampling/Area cost
Optimization	10	Texture compression/Mesh compression/Audio compression/Scene analysis/Static flags/LOD/Duplicate materials/Overdraw
Profiler	10	FPS/Memory/Texture/Mesh/Material/Audio/Rendering stats/Object count/AssetBundle
Scene	10	Multi-scene load/Unload/Activate/Screenshot/Context/Dependency analysis/Report export
ScriptableObject	13	Create/Read-Write/Serialized-property path write (nested/array/reference)/Batch set/Delete/Find/JSON import-export
Smart	10	Scene SQL query/Spatial query/Auto layout/Snap to ground/Grid snap/Randomize/Replace
Terrain	10	Terrain create/Heightmap/Perlin noise/Smooth/Flatten/Texture painting
Texture	10	Texture import settings/Platform settings/Sprite/Type/Size search/Batch
Project	10	Player builds/Render pipeline/Build settings/Package management/Layer/Tag/PlayerSettings/Quality
Addressables	8	Addressable asset groups/Profiles/Labels/Build paths/Build/Entry add-remove (com.unity.addressables, reflection-based)
Sample	8	Basic examples: Create/Delete/Transform/Scene info

⚠️ Most modules support *_batch batch operations. When operating on multiple objects, prioritize batch Skills for better performance.

🧠 unity-skills/skills/ also includes 24 advisory design modules for architecture, script design, performance, maintainability, Inspector guidance, and package-specific source rules.

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📂 Project Structure

.
├── SkillsForUnity/                 # Unity Editor Plugin (UPM Package)
│   ├── package.json                # com.besty.unity-skills
│   ├── unity-skills~/              # Cross-platform AI Skill Template (tilde-hidden, bundled with package)
│   │   ├── SKILL.md                # Main Skill Definitions (AI-readable)
│   │   ├── scripts/
│   │   │   └── unity_skills.py     # Python Client Library
│   │   ├── skills/                 # 74 module docs (50 REST/module docs + 24 advisory docs)
│   │   └── references/             # Unity Development References
│   └── Editor/Skills/              # Core Skill Logic (54 functional source modules, 55 *Skills.cs files, 784 Skills)
│       ├── SkillsHttpServer.cs     # HTTP Server Core (Producer-Consumer)
│       ├── SkillRouter.cs          # Request Routing & Reflection-based Skill Discovery
│       ├── WorkflowManager.cs      # Persistent Workflow (Task/Session/Snapshot)
│       ├── RegistryService.cs      # Global Registry (Multi-instance Discovery)
│       ├── GameObjectFinder.cs     # Unified GO Finder (name/instanceId/path)
│       ├── BatchExecutor.cs        # Generic Batch Processing Framework
│       ├── GameObjectSkills.cs     # GameObject Operations (18 skills)
│       ├── MaterialSkills.cs       # Material Operations (21 skills)
│       ├── CinemachineSkills.cs    # Cinemachine 2.x/3.x (34 skills)
│       ├── WorkflowSkills.cs       # Workflow Undo/Rollback (24 skills)
│       ├── PerceptionSkills.cs     # Scene Understanding (18 skills)
│       └── ...                     # 784 Skills source code
├── docs/
│   └── SETUP_GUIDE.md              # Complete Setup & Usage Guide
├── CHANGELOG.md                    # Version Update Log
└── LICENSE                         # MIT License

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⭐Star History

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📄 License

This project is licensed under the MIT License.

Bundled font (separate license): the editor window bundles a subsetted CJK font SkillsForUnity/Editor/UI/Fonts/UnitySkillsCN-Regular.ttf, derived from Maple Mono (CN variant), licensed under the SIL Open Font License 1.1 — not MIT. The full license and attribution travel with the font in that folder (OFL.txt, THIRD-PARTY-NOTICES.md).