ecto/vcad/skill

Name: skill
Author: ecto

Claude Code and agent skill by ecto/vcad

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Create 3D CAD models using vcad MCP tools. Use when the user asks to create 3D parts, mechanical components, plates with holes, brackets, or any parametric geometry. Supports primitives (cube, cylinder, sphere, cone), boolean operations, transforms, patterns, and export to STL/GLB.

Install

npx vskill@latest install ecto/vcad/skill

SKILL.md

vcad - Parametric CAD for AI Agents

Create 3D CAD models programmatically using the vcad MCP tools.

Available Tools

create_cad_document

Build geometry from structured primitives and operations.

export_cad

Export to STL (3D printing) or GLB (visualization).

inspect_cad

Get volume, surface area, bounding box, and triangle count.

Primitive Origins

Understanding where primitives are positioned is critical for correct placement:

Primitive	Origin	Extent
Cube	Corner at (0,0,0)	Extends to (size.x, size.y, size.z)
Cylinder	Base center at (0,0,0)	Height along +Z
Sphere	Center at (0,0,0)	Radius in all directions
Cone	Base center at (0,0,0)	Height along +Z

Positioning Operations

The at parameter accepts three formats:

Absolute: {x: 25, y: 15, z: 0} - exact coordinates in mm
Named: "center", "top-center", "bottom-center" - relative to base primitive
Percentage: {x: "50%", y: "50%"} - percentage of base primitive bounds

Common Patterns

Plate with Centered Hole

json

{
  "parts": [{
    "name": "plate",
    "primitive": {"type": "cube", "size": {"x": 50, "y": 50, "z": 5}},
    "operations": [
      {"type": "hole", "diameter": 6, "at": "center"}
    ]
  }]
}

Plate with Corner Holes

json

{
  "parts": [{
    "name": "mounting_plate",
    "primitive": {"type": "cube", "size": {"x": 100, "y": 60, "z": 5}},
    "operations": [
      {"type": "hole", "diameter": 4, "at": {"x": 10, "y": 10}},
      {"type": "hole", "diameter": 4, "at": {"x": 90, "y": 10}},
      {"type": "hole", "diameter": 4, "at": {"x": 10, "y": 50}},
      {"type": "hole", "diameter": 4, "at": {"x": 90, "y": 50}}
    ]
  }]
}

Cylinder with Blind Hole

json

{
  "parts": [{
    "name": "bushing",
    "primitive": {"type": "cylinder", "radius": 15, "height": 20},
    "operations": [
      {"type": "hole", "diameter": 10, "depth": 15, "at": "center"}
    ]
  }]
}

L-Bracket

json

{
  "parts": [{
    "name": "bracket",
    "primitive": {"type": "cube", "size": {"x": 40, "y": 40, "z": 5}},
    "operations": [
      {"type": "union", "primitive": {"type": "cube", "size": {"x": 5, "y": 40, "z": 30}}, "at": {"x": 0, "y": 0, "z": 5}},
      {"type": "hole", "diameter": 5, "at": {"x": 20, "y": 20}},
      {"type": "difference", "primitive": {"type": "cylinder", "radius": 2.5, "height": 40}, "at": {"x": 2.5, "y": 20, "z": 20}}
    ]
  }]
}

Linear Pattern of Holes

json

{
  "parts": [{
    "name": "rail",
    "primitive": {"type": "cube", "size": {"x": 200, "y": 20, "z": 10}},
    "operations": [
      {
        "type": "difference",
        "primitive": {"type": "cylinder", "radius": 3, "height": 15},
        "at": {"x": 20, "y": 10, "z": -2}
      },
      {
        "type": "linear_pattern",
        "direction": {"x": 1, "y": 0, "z": 0},
        "count": 5,
        "spacing": 40
      }
    ]
  }]
}

Circular Pattern

json

{
  "parts": [{
    "name": "flange",
    "primitive": {"type": "cylinder", "radius": 40, "height": 10},
    "operations": [
      {"type": "hole", "diameter": 20, "at": "center"},
      {
        "type": "difference",
        "primitive": {"type": "cylinder", "radius": 4, "height": 15},
        "at": {"x": 30, "y": 0, "z": -2}
      },
      {
        "type": "circular_pattern",
        "axis_origin": {"x": 0, "y": 0, "z": 0},
        "axis_dir": {"x": 0, "y": 0, "z": 1},
        "count": 6,
        "angle_deg": 360
      }
    ]
  }]
}

Workflow

Create: Use create_cad_document to build geometry
Inspect: Use inspect_cad to verify dimensions and volume
Export: Use export_cad to save as .stl or .glb

Tips

Holes default to through-holes; specify depth for blind holes
Use percentage positioning for parametric designs that scale
Cube origin is at corner - add half-size to center operations
Cylinder/cone origins are at base center - no X/Y offset needed for centered holes
Always extend cutting cylinders past the part (the hole operation does this automatically)

Setup

Recommended: Install the vcad Claude Code plugin for zero-config setup (includes MCP server, skills, and slash commands):

bash

claude plugin add vcad

Manual setup: Add the vcad MCP server to your Claude Code config:

json

{
  "mcpServers": {
    "vcad": {
      "command": "npx",
      "args": ["-y", "@vcad/mcp"]
    }
  }
}

Or run from local checkout:

json

{
  "mcpServers": {
    "vcad": {
      "command": "node",
      "args": ["packages/mcp/dist/index.js"]
    }
  }
}

Security

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Quality evaluation

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Source

SKILL.md in the repositoryCheckingskill/SKILL.md

Popularity

7-day trend score: 0

Refreshed 18 Mar 2026, 7 months ago.

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