fix-3d-physics-collisions
A Unity skill for diagnosing 3D PhysX problems: collision or trigger callbacks that never fire, bodies that tunnel through one another, raycasts that fail to hit, and badly behaving Mesh Colliders.
What the skill teaches
A Unity skill for diagnosing 3D PhysX problems: collision or trigger callbacks that never fire, bodies that tunnel through one another, raycasts that fail to hit, and badly behaving Mesh Colliders. The agent identifies the symptom, works through the matching checklist (collisions, triggers, raycasts or other symptoms), reads console errors, and can use a bundled collision debugger script to inspect what the physics engine sees. It requires Unity 6000.3 or later, keeps to a tool budget, has a fixed report format, and works through the Unity CLI against the open Editor.
Capabilities
- Diagnose collision and trigger callbacks not firing
- Fix objects passing through each other
- Debug raycasts that miss
- Fix Mesh Collider problems
About
- Publisher
- Unity Technologies
- Tool
- Unity
Works with
Install
- Run this to add it to Any client:
npx skills add Unity-Technologies/skills
What's inside
- SECURITY.md
- references/collision-checklist.md
- references/collision-debugger.md
- references/other-symptoms.md
- references/raycast-checklist.md
- references/trigger-checklist.md
- scripts/CollisionDebugger.cs
MCP servers and skills can run code on your computer and act on your data. Review the source before installing.
This skill includes scripts that your agent may run.
Details
| Fact | Value | Source |
|---|---|---|
| Type | Skill | |
| Tool | Unity | |
| Publisher | Unity Technologies | source |
| Official status | Officialin Unity's own GitHub organisation; README says the skills are maintained by Unity | source |
| Needs an API key or sign-in | Not stated in its documentation | |
| Includes scripts | Yes | source |
| Platforms | Not stated in its documentation | |
| AI clients | Claude Code, Cursor, Cline | source |
| Licence | LicenseRef-Unity-Companion-License | source |
| Pricing | Not stated in its documentation | |
| Activity | Last commit Nov 6, 20261,239 GitHub starsDownload data not available (not on npm or PyPI) | source |
| Links | Repository |
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Sources
- GitHub repositorygithub.com/Unity-Technologies/skills · Backs: AI clients, Official status, PublisherNov 13, 2026
- Skill file (SKILL.md)github.com/Unity-Technologies/skills · Backs: LicenceNov 10, 2026
- Licence file (LICENSE.md)github.com/Unity-Technologies/skills · Backs: LicenceNov 13, 2026
- Folder in the repository (fix-3d-physics-collisions)github.com/Unity-Technologies/skills · Backs: Includes scriptsNov 10, 2026
- GitHub repositorygithub.com/unity-technologies/skills · Backs: ActivityNov 11, 2026