gameobject-create

Create a new GameObject in the currently opened Prefab or active Scene, optionally parented under another GameObject and pre-positioned. Pass `primitiveType` to spawn a Unity primitive (Cube, Sphere, etc.) instead of an empty GameObject.

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GameObject / Create

Create a new GameObject in opened Prefab or in a Scene. If needed - provide proper 'position', 'rotation' and 'scale' to reduce amount of operations.

Inputs

name — required non-empty name.
parentGameObjectRef (optional) — when provided, the new GameObject is parented under this one (SetParent(parent, worldPositionStays: false)); otherwise it's created at scene/prefab root.
position / rotation / scale — optional transform; default to zero / zero / one.
isLocalSpace — when true, applies the transform in local space relative to the parent.
primitiveType (optional) — when set, the GameObject is created via GameObject.CreatePrimitive (adds the appropriate renderer/collider for the primitive shape).

How to Call

unity-mcp-cli run-tool gameobject-create --input '{
  "name": "string_value",
  "parentGameObjectRef": "string_value",
  "position": "string_value",
  "rotation": "string_value",
  "scale": "string_value",
  "isLocalSpace": false,
  "primitiveType": "string_value"
}'

For complex input (multi-line strings, code), save the JSON to a file and use:
unity-mcp-cli run-tool gameobject-create --input-file args.json
Or pipe via stdin (recommended):
unity-mcp-cli run-tool gameobject-create --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

Name	Type	Required	Description
`name`	`string`	Yes	Name of the new GameObject.
`parentGameObjectRef`	`any`	No	Parent GameObject reference. If not provided, the GameObject will be created at the root of the scene or prefab.
`position`	`any`	No	Transform position of the GameObject.
`rotation`	`any`	No	Transform rotation of the GameObject. Euler angles in degrees.
`scale`	`any`	No	Transform scale of the GameObject.
`isLocalSpace`	`boolean`	No	World or Local space of transform.
`primitiveType`	`any`	No

Input JSON Schema

{
  "type": "object",
  "properties": {
    "name": {
      "type": "string"
    },
    "parentGameObjectRef": {
      "$ref": "#/$defs/AIGD.GameObjectRef"
    },
    "position": {
      "$ref": "#/$defs/UnityEngine.Vector3"
    },
    "rotation": {
      "$ref": "#/$defs/UnityEngine.Vector3"
    },
    "scale": {
      "$ref": "#/$defs/UnityEngine.Vector3"
    },
    "isLocalSpace": {
      "type": "boolean"
    },
    "primitiveType": {
      "$ref": "#/$defs/UnityEngine.PrimitiveType"
    }
  },
  "$defs": {
    "System.Type": {
      "type": "string"
    },
    "AIGD.GameObjectRef": {
      "type": "object",
      "properties": {
        "instanceID": {
          "type": "integer",
          "description": "instanceID of the UnityEngine.Object. If it is '0' and 'path', 'name', 'assetPath' and 'assetGuid' is not provided, empty or null, then it will be used as 'null'. Priority: 1 (Recommended)"
        },
        "path": {
          "type": "string",
          "description": "Path of a GameObject in the hierarchy Sample 'character/hand/finger/particle'. Priority: 2."
        },
        "name": {
          "type": "string",
          "description": "Name of a GameObject in hierarchy. Priority: 3."
        },
        "assetType": {
          "$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."
    },
    "UnityEngine.Vector3": {
      "type": "object",
      "properties": {
        "x": {
          "type": "number"
        },
        "y": {
          "type": "number"
        },
        "z": {
          "type": "number"
        }
      },
      "required": [
        "x",
        "y",
        "z"
      ],
      "additionalProperties": false
    },
    "UnityEngine.PrimitiveType": {
      "type": "string",
      "enum": [
        "Sphere",
        "Capsule",
        "Cylinder",
        "Cube",
        "Plane",
        "Quad"
      ]
    }
  },
  "required": [
    "name"
  ]
}

Output

Output JSON Schema

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

Repository: IvanMurzak/Unity-MCP
Path: Unity-MCP-Plugin/.claude/skills/gameobject-create/SKILL.md
Commit: e0a24ef

Last updated: about 12 hours ago
First committed: 2 months ago

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