Kursach_StealthAction/.agent/skills/probuilder-extrude/SKILL.md

name	description	metadata
probuilder-extrude	Extrude selected faces of a `ProBuilderMesh` along their normals, creating new geometry. Supply either `faceIndices` (explicit) or `faceDirection` (semantic); exactly one is required. Positive `distance` extrudes outward, negative inward.	generated-by mcp-plugin-dotnet

Extrude ProBuilder faces

Extrude selected faces of a ProBuilderMesh along their normals, creating new geometry by pushing faces outward (positive distance) or inward (negative distance). Faces can be selected explicitly by index or semantically by direction.

Inputs

• gameObjectRef — the GameObject hosting the ProBuilderMesh component.
• faceIndices — explicit array of face indices to extrude.
• faceDirection — semantic alternative (Up, Down, Left, Right, Forward, Back). Exactly one of faceIndices / faceDirection is required.
• distance — extrusion distance. Positive = outward, negative = inward. Default 0.5.
• extrudeMethod — IndividualFaces (each face extrudes independently), FaceNormal (faces extrude as a group along the averaged normal — the default), or VertexNormal (vertices move along their normals).

Examples

• Extrude the top face up by 1 unit: faceDirection="up", distance=1.
• Extrude specific faces: faceIndices=[0, 2, 4].

Behavior

The mesh is rebuilt (ToMesh → Refresh), dirty-flagged, and the Editor repaints. The whole call runs on the Unity main thread.

How to Call

unity-mcp-cli run-tool probuilder-extrude --input '{
  "gameObjectRef": "string_value",
  "faceIndices": "string_value",
  "faceDirection": "string_value",
  "distance": 0,
  "extrudeMethod": "string_value"
}'

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

unity-mcp-cli run-tool probuilder-extrude --input-file args.json

Or pipe via stdin (recommended):

unity-mcp-cli run-tool probuilder-extrude --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 with a ProBuilderMesh component.
faceIndices	any	No	Array of face indices to extrude. Use this OR faceDirection, not both. Use ProBuilder_GetMeshInfo to get valid face indices.
faceDirection	any	No	Semantic face selection by direction. Use this OR faceIndices, not both.
distance	number	No	Distance to extrude the faces. Positive values extrude outward along face normals, negative values extrude inward.
extrudeMethod	string	No	Extrusion method: IndividualFaces (each face extrudes independently), FaceNormal (faces extrude as a group along averaged normal), VertexNormal (vertices move along their normals).

Input JSON Schema

{
  "type": "object",
  "properties": {
    "gameObjectRef": {
      "$ref": "#/$defs/AIGD.GameObjectRef"
    },
    "faceIndices": {
      "$ref": "#/$defs/System.Int32-1"
    },
    "faceDirection": {
      "$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Editor.API.FaceDirection"
    },
    "distance": {
      "type": "number"
    },
    "extrudeMethod": {
      "type": "string",
      "enum": [
        "IndividualFaces",
        "VertexNormal",
        "FaceNormal"
      ]
    }
  },
  "$defs": {
    "UnityEngine.EntityId": {
      "type": "string",
      "pattern": "^[0-9]+$"
    },
    "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."
    },
    "System.Int32-1": {
      "type": "array",
      "items": {
        "type": "integer"
      }
    },
    "com.IvanMurzak.Unity.MCP.Editor.API.FaceDirection": {
      "type": "string",
      "enum": [
        "Up",
        "Down",
        "Left",
        "Right",
        "Forward",
        "Back"
      ]
    }
  },
  "required": [
    "gameObjectRef"
  ]
}

Output

Output JSON Schema

{
  "type": "object",
  "properties": {
    "result": {
      "$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Editor.API.Tool_ProBuilder-ExtrudeResponse"
    }
  },
  "$defs": {
    "System.Int32-1": {
      "type": "array",
      "items": {
        "type": "integer"
      }
    },
    "com.IvanMurzak.Unity.MCP.Editor.API.Tool_ProBuilder-ExtrudeResponse": {
      "type": "object",
      "properties": {
        "extrudedFaceCount": {
          "type": "integer"
        },
        "selectionMethod": {
          "type": "string"
        },
        "extrudedFaceIndices": {
          "$ref": "#/$defs/System.Int32-1"
        },
        "extrudeMethod": {
          "type": "string"
        },
        "distance": {
          "type": "number"
        },
        "newFacesCreated": {
          "type": "integer"
        },
        "newFaceIndices": {
          "$ref": "#/$defs/System.Int32-1"
        },
        "totalFaceCount": {
          "type": "integer"
        },
        "totalVertexCount": {
          "type": "integer"
        },
        "totalEdgeCount": {
          "type": "integer"
        }
      },
      "required": [
        "extrudedFaceCount",
        "distance",
        "newFacesCreated",
        "totalFaceCount",
        "totalVertexCount",
        "totalEdgeCount"
      ]
    }
  },
  "required": [
    "result"
  ]
}