Agent skill

assets-prefab-create

Create a prefab from a GameObject in the current active scene. The prefab will be saved in the project assets at the specified path. Creates folders recursively if they do not exist. If the source GameObject is already a prefab instance and 'connectGameObjectToPrefab' is true, a Prefab Variant is created automatically. To create a Prefab Variant from an existing prefab asset, provide 'sourcePrefabAssetPath' instead of 'gameObjectRef'. Use 'gameobject-find' tool to find the target GameObject first.

View SKILL.md on GitHub Repository
Stars 2,087
Forks 190

Install this agent skill to your Project

npx add-skill https://github.com/IvanMurzak/Unity-MCP/tree/main/Unity-MCP-Plugin/.claude/skills/assets-prefab-create

SKILL.md

Assets / Prefab / Create

How to Call

bash
unity-mcp-cli run-tool assets-prefab-create --input '{
  "prefabAssetPath": "string_value",
  "gameObjectRef": "string_value",
  "sourcePrefabAssetPath": "string_value",
  "connectGameObjectToPrefab": false
}'

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

bash
unity-mcp-cli run-tool assets-prefab-create --input-file args.json

Or pipe via stdin (recommended):

bash
unity-mcp-cli run-tool assets-prefab-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
prefabAssetPath string Yes Prefab asset path. Should be in the format 'Assets/Path/To/Prefab.prefab'.
gameObjectRef any No Reference to a scene GameObject to create the prefab from. If the GameObject is already a prefab instance, a Prefab Variant is created when 'connectGameObjectToPrefab' is true. Optional if 'sourcePrefabAssetPath' is provided.
sourcePrefabAssetPath string No Path to an existing prefab asset to create a Prefab Variant from (e.g. 'Assets/Prefabs/Base.prefab'). When provided, a temporary instance is created, saved as a Prefab Variant, and cleaned up. Optional if 'gameObjectRef' is provided.
connectGameObjectToPrefab boolean No If true, the scene GameObject will be connected to the new prefab (becoming a prefab instance). If the source is already a prefab instance, this creates a Prefab Variant. If false, the prefab asset is created but the scene GameObject remains unchanged. Ignored when 'sourcePrefabAssetPath' is used (always creates a variant).

Input JSON Schema

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

Output

Output JSON Schema

json
{
  "type": "object",
  "properties": {
    "result": {
      "$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Runtime.Data.AssetObjectRef",
      "description": "Reference to UnityEngine.Object asset instance. It could be Material, ScriptableObject, Prefab, and any other Asset. Anything located in the Assets and Packages folders."
    }
  },
  "$defs": {
    "System.Type": {
      "type": "string"
    },
    "com.IvanMurzak.Unity.MCP.Runtime.Data.AssetObjectRef": {
      "type": "object",
      "properties": {
        "instanceID": {
          "type": "integer",
          "description": "instanceID of the UnityEngine.Object. If this is '0' and 'assetPath' and 'assetGuid' is not provided, empty or null, then it will be used as 'null'."
        },
        "assetType": {
          "$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": "Reference to UnityEngine.Object asset instance. It could be Material, ScriptableObject, Prefab, and any other Asset. Anything located in the Assets and Packages folders."
    }
  },
  "required": [
    "result"
  ]
}

Recommended Agent Skills

Expand your agent's capabilities with these related and highly-rated skills.

IvanMurzak/Unity-MCP

github-pr-review-fix

Review and resolve PR comments from GitHub. Validates each comment, fixes legitimate issues.

2,087 190
Explore
IvanMurzak/Unity-MCP

build-cli

Build the unity-mcp-cli TypeScript CLI tool and link it globally for terminal use.

2,087 190
Explore
IvanMurzak/Unity-MCP

assets-material-create

Create new material asset with default parameters. Creates folders recursively if they do not exist. Provide proper 'shaderName' - use 'assets-shader-list-all' tool to find available shaders.

2,087 190
Explore
IvanMurzak/Unity-MCP

screenshot-scene-view

Captures a screenshot from the Unity Editor Scene View and returns it as an image. Returns the image directly for visual inspection by the LLM.

2,087 190
Explore
IvanMurzak/Unity-MCP

editor-application-get-state

Returns available information about 'UnityEditor.EditorApplication'. Use it to get information about the current state of the Unity Editor application. Such as: playmode, paused state, compilation state, etc.

2,087 190
Explore
IvanMurzak/Unity-MCP

scene-open

Open scene from the project asset file. Use 'assets-find' tool to find the scene asset first.

2,087 190
Explore

Didn't find tool you were looking for?

Be as detailed as possible for better results