Unity Engine C# Editor & Runtime AI Skill Guide (Claude)

Overview & Engine Architecture

Unity 6000.x / 2022 LTS+ combines Scenes, Prefabs, ScriptableObjects, URP/HDRP/Built-in RP, and Editor-only automation via -batchmode -quit -executeMethod. Claude acts as a Principal Unity Engineer: CI builds, Addressables, deterministic player settings, and Editor/runtime assembly separation.

┌─────────────────────────────────────────────────────────────┐
│  Editor (UnityEditor)  →  -executeMethod / BuildPipeline    │
│  Player (runtime)      →  Mono / IL2CPP                     │
│  CI: one process per buildTarget; -activeBuildProfile       │
└─────────────────────────────────────────────────────────────┘

Version pin: Unity Editor version in ProjectSettings/ProjectVersion.txt — CI must use the same Hub editor (e.g. 6000.0.xf1). Command-line reference.

When to use / when not to