skill CX Codex

create-2d-physics — Claude Code skill: what it does, how to install

Q: How to install create-2d-physics in Claude Code?

Run `npx skills add Unity-Technologies/skills --skill create-2d-physics -a claude-code` in your terminal.

Configures and repairs Unity 2D physics setups. It supports both the modern 2D Physics Core and legacy Rigidbody 2D workflows.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓

npx skills add Unity-Technologies/skills --skill create-2d-physics -a claude-code

Open on GitHub

What create-2d-physics does

Unity has two completely disconnected 2D physics architectures. Legacy relies on Rigidbody2D and Collider2D, while modern 2D Physics Core uses PhysicsPose or the Unity.U2D.Physics namespace. Because their codebases do not communicate, running instructions meant for the other stack yields silent failures. The skill probes the loaded assemblies first. If the project contains 3D physics, the agent stops immediately.

The workflow depends on the unity command CLI alongside unity-cli and unity-pipeline. Code fragments run through eval as statement blocks, which means using directives trigger compilation errors. Every type must be fully qualified. Before applying changes, the skill creates a rollback restore point. It also strips out temporary runtime logs after checking behavior. Testing the wrong physics route will compile cleanly but change nothing.

What it helps with

configure components for the com.unity.2d.physics package
resolve collision setups using legacy Rigidbody2D
probe assemblies to detect the active 2D physics engine
execute C# snippets safely through eval without namespace errors

Example prompts for the agent

Detect which 2D physics system this Unity project uses and configure the player collider
Fix the CS0246 compilation error in our 2D Physics Core eval script
Set up a legacy Rigidbody2D simulation baseline before changing gravity

How to install create-2d-physics

1Skills CLI (Vercel)

npx skills add Unity-Technologies/skills --skill create-2d-physics -a claude-code

2Manually: put the files in place

~/.claude/skills/create-2d-physics/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/create-2d-physics/

1Skills CLI (Vercel)

npx skills add Unity-Technologies/skills --skill create-2d-physics -a codex

2Manually: put the files in place

.agents/skills/create-2d-physics/SKILL.md

For all projects use ~/.agents/skills/

1Skills CLI (Vercel)

npx skills add Unity-Technologies/skills --skill create-2d-physics -a cursor

2Manually: put the files in place

.cursor/skills/create-2d-physics/SKILL.md

Cursor also reads .agents/skills/ and .claude/skills/

1GitHub CLI

gh skill install Unity-Technologies/skills create-2d-physics

2Manually: put the files in place

.github/skills/create-2d-physics/SKILL.md

1Skills CLI (Vercel)

npx skills add Unity-Technologies/skills --skill create-2d-physics -a gemini-cli

2Platform CLI

gemini skills install https://github.com/Unity-Technologies/skills --path skills/create-2d-physics

Manually: put the files in place

.devin/skills/create-2d-physics/SKILL.md

The legacy .windsurf/skills/ path still works

Skills CLI (Vercel)

npx skills add Unity-Technologies/skills --skill create-2d-physics -a opencode

Step by step, with commands for each platform: How to install skills in Claude Code: five ways

Questions about create-2d-physics

How to install create-2d-physics in Claude Code?

Run npx skills add Unity-Technologies/skills --skill create-2d-physics -a claude-code in your terminal.

What does create-2d-physics do?

It configures and fixes Unity 2D physics across both legacy Rigidbody 2D and modern 2D Physics Core pipelines.

Does create-2d-physics handle 3D physics?

No, the skill only supports 2D physics. If 3D physics components are detected, the agent stops without making changes.

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