Assets / Prefab / Open

Open prefab edit mode for a specific GameObject. In the Edit mode you can modify the prefab. The modification will be applied to all instances of the prefab across the project. Note: Please use 'assets-prefab-close' tool later to exit prefab editing mode.

Inputs

• gameObjectRef — reference to a scene prefab instance OR a prefab asset GameObject. The tool resolves the prefab asset path via PrefabUtility.GetPrefabAssetPathOfNearestInstanceRoot and opens the appropriate prefab stage.

Behavior

Asset-side GameObjects open via the simple OpenPrefab(path) overload. Scene-instance GameObjects open via OpenPrefab(path, gameObject) so the editor remembers which instance prompted the edit. Editor windows are repainted before returning. Throws when the GameObject cannot be resolved or the stage fails to open.

How to Call

unity-mcp-cli run-tool assets-prefab-open --input '{
  "gameObjectRef": "string_value"
}'