Unity-MCP 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.

install

source · Clone the upstream repo

git clone https://github.com/IvanMurzak/Unity-MCP

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/IvanMurzak/Unity-MCP "$T" && mkdir -p ~/.claude/skills && cp -r "$T/Unity-MCP-Plugin/.claude/skills/gameobject-create" ~/.claude/skills/ivanmurzak-unity-mcp-gameobject-create && rm -rf "$T"

manifest: Unity-MCP-Plugin/.claude/skills/gameobject-create/SKILL.md

source content

GameObject / Create

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

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/com.IvanMurzak.Unity.MCP.Runtime.Data.GameObjectRef"
    },
    "position": {
      "$ref": "#/$defs/UnityEngine.Vector3"
    },
    "rotation": {
      "$ref": "#/$defs/UnityEngine.Vector3"
    },
    "scale": {
      "$ref": "#/$defs/UnityEngine.Vector3"
    },
    "isLocalSpace": {
      "type": "boolean"
    },
    "primitiveType": {
      "$ref": "#/$defs/UnityEngine.PrimitiveType"
    }
  },
  "$defs": {
    "System.Type": {
      "type": "string"
    },
    "com.IvanMurzak.Unity.MCP.Runtime.Data.GameObjectRef": {
      "type": "object",
      "properties": {
        "instanceID": {
          "type": "integer",
          "description": "instanceID of the UnityEngine.Object. If it is '0' and 'path', 'name', 'assetPath' and 'assetGuid' is not provided, empty or null, then it will be used as 'null'. Priority: 1 (Recommended)"
        },
        "path": {
          "type": "string",
          "description": "Path of a GameObject in the hierarchy Sample 'character/hand/finger/particle'. Priority: 2."
        },
        "name": {
          "type": "string",
          "description": "Name of a GameObject in hierarchy. Priority: 3."
        },
        "assetType": {
          "$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/com.IvanMurzak.Unity.MCP.Runtime.Data.GameObjectRef",
      "description": "Find GameObject in opened Prefab or in the active Scene."
    }
  },
  "$defs": {
    "System.Type": {
      "type": "string"
    },
    "com.IvanMurzak.Unity.MCP.Runtime.Data.GameObjectRef": {
      "type": "object",
      "properties": {
        "instanceID": {
          "type": "integer",
          "description": "instanceID of the UnityEngine.Object. If it is '0' and 'path', 'name', 'assetPath' and 'assetGuid' is not provided, empty or null, then it will be used as 'null'. Priority: 1 (Recommended)"
        },
        "path": {
          "type": "string",
          "description": "Path of a GameObject in the hierarchy Sample 'character/hand/finger/particle'. Priority: 2."
        },
        "name": {
          "type": "string",
          "description": "Name of a GameObject in hierarchy. Priority: 3."
        },
        "assetType": {
          "$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"
  ]
}