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unity-package-management — Claude Code skill: UPM guide

Discovers, installs, and removes Unity packages outside the Editor using Pipeline commands or a headless C# fallback. Helpful for CI builds and fast project setups.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓ 
npx skills add Unity-Technologies/skills --skill unity-package-management -a claude-code
Open on GitHub

What unity-package-management does

The skill manages Unity Package Manager dependencies through the terminal instead of the GUI. Direct manual edits to Packages/manifest.json are forbidden because they break dependency resolution. The tool relies on precise API calls. When an Editor instance is running with com.unity.pipeline, it queries parameter schemas and invokes unity command package add or remove.

If no Editor is running, the skill falls back to a batchmode C# script. It writes Assets/Editor/ProjectBootstrap/PackageInstaller.cs and calls Client.AddAndRemove. Running this through unity run fails immediately. The default -quit flag terminates the process before asynchronous UPM downloads finish. Direct execution without -quit lets update ticks resolve dependencies and exit cleanly.

What it helps with

  • install UPM dependencies without editing manifest.json by hand
  • inspect package schemas and available versions from the terminal
  • configure required Unity packages headlessly in CI pipelines
  • remove unused default packages included by project templates

Example prompts for the agent

  • Add com.unity.inputsystem to the project using Pipeline commands.
  • Check installed UPM packages and list their current versions.
  • Remove unwanted default render pipeline packages headlessly.

How to install unity-package-management

1Skills CLI (Vercel)

npx skills add Unity-Technologies/skills --skill unity-package-management -a claude-code

2Manually: put the files in place

~/.claude/skills/unity-package-management/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/unity-package-management/

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

Questions about unity-package-management

How to install unity-package-management in Claude Code?

Run npx skills add Unity-Technologies/skills --skill unity-package-management -a claude-code in your terminal.

What does unity-package-management do?

It resolves, inspects, and modifies UPM packages outside the Editor window. It prioritizes the Editor's Pipeline command group and switches to headless C# scripts when needed.

Why does the headless fallback require launching the Editor without -quit?

UPM operations through Client.AddAndRemove are asynchronous and need EditorApplication.update ticks to complete. Using -quit kills the Editor immediately before the background process finishes resolving dependencies.

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