Gameobject Create

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: > ``bash > unity-mcp-cli run-tool gameobject-create --input-file args.json > ` > > Or pipe via stdin (recommended): > `bash > unity-mcp-cli run-tool gameobject-create --input-file - {"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"
  ]
}

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: IvanMurzak
• Source: IvanMurzak/Unity-MCP
• License: Apache-2.0
• Homepage: https://ai-game.dev

Install and usage instructions live in the source repository linked above.