Kursach_StealthAction/.opencode/skills/terrain-add-layer/SKILL.md

name	description	metadata
terrain-add-layer	Add a `TerrainLayer` to a `Terrain`. Provide either the asset path of an existing `.terrainlayer` asset, or a texture asset path to build a new TerrainLayer from. Returns the index of the added layer.	generated-by mcp-plugin-dotnet

Terrain / Add Layer

Append a TerrainLayer to a Terrain's TerrainData.terrainLayers.

Inputs

• gameObjectRef — the GameObject hosting the Terrain (required).
• terrainLayerAssetPath — optional project path to an existing .terrainlayer asset to add.
• diffuseTextureAssetPath — optional project path to a Texture2D. When terrainLayerAssetPath is omitted, a new TerrainLayer is created in-memory with this diffuse texture and added.
• tileSizeX / tileSizeY — tile size (world units) for a newly-created layer (default 15,15).

Behavior

Loads or creates the TerrainLayer, appends it to TerrainData.terrainLayers, marks the asset + scene dirty, repaints, and returns the new layer index. Runs on the Unity main thread.

How to Call

unity-mcp-cli run-tool terrain-add-layer --input '{
  "gameObjectRef": "string_value",
  "terrainLayerAssetPath": "string_value",
  "diffuseTextureAssetPath": "string_value",
  "tileSizeX": 0,
  "tileSizeY": 0
}'

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

unity-mcp-cli run-tool terrain-add-layer --input-file args.json

Or pipe via stdin (recommended):

unity-mcp-cli run-tool terrain-add-layer --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
gameObjectRef	any	Yes	Reference to the GameObject containing the Terrain component.
terrainLayerAssetPath	string	No	Optional project path to an existing .terrainlayer asset to add.
diffuseTextureAssetPath	string	No	Optional project path to a Texture2D used to build a new TerrainLayer (when no asset path is given).
tileSizeX	number	No	Tile size X (world units) for a newly-created layer.
tileSizeY	number	No	Tile size Y (world units) for a newly-created layer.

Input JSON Schema

{
  "type": "object",
  "properties": {
    "gameObjectRef": {
      "$ref": "#/$defs/AIGD.GameObjectRef"
    },
    "terrainLayerAssetPath": {
      "type": "string"
    },
    "diffuseTextureAssetPath": {
      "type": "string"
    },
    "tileSizeX": {
      "type": "number"
    },
    "tileSizeY": {
      "type": "number"
    }
  },
  "$defs": {
    "UnityEngine.EntityId": {
      "type": "string",
      "pattern": "^[0-9]+$"
    },
    "System.Type": {
      "type": "string"
    },
    "AIGD.GameObjectRef": {
      "type": "object",
      "properties": {
        "instanceID": {
          "$ref": "#/$defs/UnityEngine.EntityId",
          "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": [
    "gameObjectRef"
  ]
}

Output

Output JSON Schema

{
  "type": "object",
  "properties": {
    "result": {
      "$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Editor.API.Tool_Terrain-TerrainAddLayerResponse"
    }
  },
  "$defs": {
    "AIGD.GameObjectRef": {
      "type": "object",
      "properties": {
        "instanceID": {
          "$ref": "#/$defs/UnityEngine.EntityId",
          "description": "instanceID of the UnityEngine.Object. If it is '0' and 'path', 'name', 'assetPath' and 'assetGuid' is not provided, empty or null, then it will be used as 'null'. Priority: 1 (Recommended)"
        },
        "path": {
          "type": "string",
          "description": "Path of a GameObject in the hierarchy Sample 'character/hand/finger/particle'. Priority: 2."
        },
        "name": {
          "type": "string",
          "description": "Name of a GameObject in hierarchy. Priority: 3."
        },
        "assetType": {
          "$ref": "#/$defs/System.Type",
          "description": "Type of the asset."
        },
        "assetPath": {
          "type": "string",
          "description": "Path to the asset within the project. Starts with 'Assets/'"
        },
        "assetGuid": {
          "type": "string",
          "description": "Unique identifier for the asset."
        }
      },
      "required": [
        "instanceID"
      ],
      "description": "Find GameObject in opened Prefab or in the active Scene."
    },
    "UnityEngine.EntityId": {
      "type": "string",
      "pattern": "^[0-9]+$"
    },
    "System.Type": {
      "type": "string"
    },
    "AIGD.ComponentRef": {
      "type": "object",
      "properties": {
        "index": {
          "type": "integer",
          "description": "Component 'index' attached to a gameObject. The first index is '0' and that is usually Transform or RectTransform. Priority: 2. Default value is -1."
        },
        "typeName": {
          "type": "string",
          "description": "Component type full name. Sample 'UnityEngine.Transform'. If the gameObject has two components of the same type, the output component is unpredictable. Priority: 3. Default value is null."
        },
        "instanceID": {
          "$ref": "#/$defs/UnityEngine.EntityId",
          "description": "instanceID of the UnityEngine.Object. If this is '0', then it will be used as 'null'."
        }
      },
      "required": [
        "index",
        "instanceID"
      ],
      "description": "Component reference. Used to find a Component at GameObject."
    },
    "com.IvanMurzak.Unity.MCP.Editor.API.Tool_Terrain-TerrainAddLayerResponse": {
      "type": "object",
      "properties": {
        "gameObjectRef": {
          "$ref": "#/$defs/AIGD.GameObjectRef",
          "description": "Reference to the Terrain GameObject."
        },
        "terrainRef": {
          "$ref": "#/$defs/AIGD.ComponentRef",
          "description": "Reference to the Terrain component."
        },
        "layerIndex": {
          "type": "integer",
          "description": "Index of the added TerrainLayer."
        },
        "layerCount": {
          "type": "integer",
          "description": "Total number of TerrainLayers after the add."
        },
        "success": {
          "type": "boolean",
          "description": "Whether the operation succeeded."
        }
      },
      "required": [
        "layerIndex",
        "layerCount",
        "success"
      ]
    }
  },
  "required": [
    "result"
  ]
}