GameObject / Duplicate

Duplicate GameObjects in opened Prefab or in a Scene. Use 'gameobject-find' tool to find the target GameObjects first.

Inputs

• gameObjectRefs — GameObjectRefList of source GameObjects.

Behavior

Resolves every input ref on the main thread (throwing on any unresolved entry to keep the batch atomic). Sets Selection.entityIds/instanceIDs to the sources and invokes Unsupported.DuplicateGameObjectsUsingPasteboard() (Unity's canonical duplicate routine). Marks every distinct affected scene dirty so the duplicated objects are saved with the scene. Returns refs to the sources (the duplicates are reachable via the post-call Selection).

How to Call

unity-mcp-cli run-tool gameobject-duplicate --input '{
  "gameObjectRefs": "string_value"
}'

For complex input (multi-line strings, code), save the JSON to a file and use:

unity-mcp-cli run-tool gameobject-duplicate --input-file args.json

Or pipe via stdin (recommended):

unity-mcp-cli run-tool gameobject-duplicate --input-file - <<'EOF'
{"param": "value"}
EOF

Troubleshooting

If unity-mcp-cli is not found, either install it globally (npm install -g unity-mcp-cli) or use npx unity-mcp-cli instead. Read the /unity-initial-setup skill for detailed installation instructions.

Input

Input JSON Schema

{
  "type": "object",
  "properties": {
    "gameObjectRefs": {
      "$ref": "#/$defs/AIGD.GameObjectRefList"
    }
  },
  "$defs": {
    "AIGD.GameObjectRef": {
      "type": "object",
      "properties": {
        "instanceID": {
          "type": "integer",
          "description": "instanceID of the UnityEngine.Object. If it is '0' and 'path', 'name', 'assetPath' and 'assetGuid' is not provided, empty or null, then it will be used as 'null'. Priority: 1 (Recommended)"
        },
        "path": {
          "type": "string",
          "description": "Path of a GameObject in the hierarchy Sample 'character/hand/finger/particle'. Priority: 2."
        },
        "name": {
          "type": "string",
          "description": "Name of a GameObject in hierarchy. Priority: 3."
        },
        "assetType": {
          "$ref": "#/$defs/System.Type",
          "description": "Type of the asset."
        },
        "assetPath": {
          "type": "string",
          "description": "Path to the asset within the project. Starts with 'Assets/'"
        },
        "assetGuid": {
          "type": "string",
          "description": "Unique identifier for the asset."
        }
      },
      "required": [
        "instanceID"
      ],
      "description": "Find GameObject in opened Prefab or in the active Scene."
    },
    "System.Type": {
      "type": "string"
    },
    "AIGD.GameObjectRefList": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/AIGD.GameObjectRef",
        "description": "Find GameObject in opened Prefab or in the active Scene."
      },
      "description": "Array of GameObjects in opened Prefab or in the active Scene."
    }
  },
  "required": [
    "gameObjectRefs"
  ]
}

Output

Output JSON Schema

{
  "type": "object",
  "properties": {
    "result": {
      "$ref": "#/$defs/System.Collections.Generic.List(AIGD.GameObjectRef)"
    }
  },
  "$defs": {
    "AIGD.GameObjectRef": {
      "type": "object",
      "properties": {
        "instanceID": {
          "type": "integer",
          "description": "instanceID of the UnityEngine.Object. If it is '0' and 'path', 'name', 'assetPath' and 'assetGuid' is not provided, empty or null, then it will be used as 'null'. Priority: 1 (Recommended)"
        },
        "path": {
          "type": "string",
          "description": "Path of a GameObject in the hierarchy Sample 'character/hand/finger/particle'. Priority: 2."
        },
        "name": {
          "type": "string",
          "description": "Name of a GameObject in hierarchy. Priority: 3."
        },
        "assetType": {
          "$ref": "#/$defs/System.Type",
          "description": "Type of the asset."
        },
        "assetPath": {
          "type": "string",
          "description": "Path to the asset within the project. Starts with 'Assets/'"
        },
        "assetGuid": {
          "type": "string",
          "description": "Unique identifier for the asset."
        }
      },
      "required": [
        "instanceID"
      ],
      "description": "Find GameObject in opened Prefab or in the active Scene."
    },
    "System.Type": {
      "type": "string"
    },
    "System.Collections.Generic.List(AIGD.GameObjectRef)": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/AIGD.GameObjectRef",
        "description": "Find GameObject in opened Prefab or in the active Scene."
      }
    }
  },
  "required": [
    "result"
  ]
}