# Unity Physics Audit

> Use to audit Unity physics: classic 3D/2D modules, Unity Physics (ECS), and Physics Core 2D (Unity 6.3–6.5).

- Skill: `rachitkumarrastogi/unity-physics-audit` (Agent Skill)
- Install (CLI): `npx skillmds@latest add rachitkumarrastogi/unity-physics-audit`
- Raw SKILL.md: https://api.skillmd.com/api/skills/rachitkumarrastogi/unity-physics-audit/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security
- Author: rachitkumarrastogi (https://skillmd.com/u/rachitkumarrastogi)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/rachitkumarrastogi/unity-physics-audit

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# Physics audit

## Discovery

1. `get_physics_stack` — packages, module hints, script labels
2. `get_physics_settings` — DynamicsManager / Physics2D settings
3. `get_layer_collision_matrix` — layer collision matrix
4. `list_packages` — `com.unity.physics`, Havok, U2D Physics

## Checklist

- Know which backend ships: classic PhysX / Box2D vs Unity Physics vs Physics Core 2D.
- Unity 6.4+ allows **disabling** built-in physics modules to shrink builds — only if unused.
- Physics Core 2D was renamed from LowLevelPhysics2D (`Unity.U2D.Physics`) in 6.5.
- For ECS projects, confirm baking/authoring components and no accidental dual simulation.

## Related

- `unity-dots-subscenes`, `unity-2d-tilemap-sprites`, `unity-build-size-optimization`