CADStack - CAD Automation Skill Pack

Generate, execute, and verify CAD scripts across FreeCAD, AutoCAD, SolidWorks, and Fusion 360 using natural language commands with safety checks.

CAD Automation Skill Pack

Control AutoCAD, SolidWorks, Fusion 360, and FreeCAD via Claude Code skills.

Why CADStack?

The problem: CAD tools require precise commands. Want a 10mm hole? You need to know the exact API call, parameter order, and coordinate system.

The solution: Describe what you want in natural language. CADStack generates the CAD script, validates it for safety, executes it, and verifies the output.

text

Traditional CAD:                    CADStack:
─────────────────────────────────    ─────────────────────────────────
1. Open CAD software                1. /cad "bracket with 4 holes"
2. Create sketch                      → Generated script
3. Draw rectangle                      → Safety validated
4. Add dimensions                      → Executed
5. Extrude                             → Dimensions verified
6. Create hole sketch                2. ✓ Done
7. Draw circle
8. Cut extrude
9. Repeat 3 more times
10. Export STEP

What makes CADStack different:

• Safety-first: Every script reviewed before execution
• Multi-backend: Same commands work across FreeCAD, AutoCAD, SolidWorks, Fusion 360
• Verification built-in: /cad-qa confirms dimensions match your intent
• Headless mode: FreeCAD works without opening a GUI

Available Skills

Skill	Description
/cad	Primary skill — Execute CAD commands: create, modify, export parts
/cad-plan	Plan complex multi-step CAD operations before execution
/cad-review	Review generated CAD scripts for safety/correctness
/cad-qa	Verify exported files, check dimensions, validate geometry
/cad-config	Set up and configure CAD backend connections

Which Skill to Use?

text

┌─────────────────────────────────────────────────────────────┐
│                    CADSTACK DECISION TREE                    │
├─────────────────────────────────────────────────────────────┤
│                                                              │
│  START                                                       │
│    │                                                         │
│    ▼                                                         │
│  "Is this your first time?" ──YES──► /cad-config            │
│    │                                (detect & configure)    │
│    NO                                                        │
│    │                                                         │
│    ▼                                                         │
│  "Simple operation?" ──YES──► /cad                          │
│  (single part, 1-3 steps)       (create, modify, export)    │
│    │                                                         │
│    NO                                                        │
│    │                                                         │
│    ▼                                                         │
│  "Multi-step or assembly?" ──► /cad-plan ──► /cad           │
│                                 (plan first)   (execute)    │
│                                                              │
│  AFTER /cad:                                                 │
│    • Need to verify output? ──► /cad-qa                     │
│    • Review script safety?  ──► /cad-review                 │
│                                                              │
└─────────────────────────────────────────────────────────────┘

Quick reference:

• Just want to make a part? → /cad
• Building something complex? → /cad-plan then /cad
• Not sure it worked? → /cad-qa
• Setting up for the first time? → /cad-config

Supported Platforms

• FreeCAD (Recommended) - Pure Python, headless mode, no license required
• AutoCAD - Requires AutoCAD running, uses COM automation
• SolidWorks - Requires SolidWorks running, uses COM automation
• Fusion 360 - Requires Fusion 360 running with bridge add-in

Quick Start

bash

# Install cadstack
git clone https://github.com/user/cadstack.git ~/.claude/skills/cadstack
cd ~/.claude/skills/cadstack && ./setup

Then in Claude Code:

text

/cad "Create a 100x50x20mm box with 5mm filleted edges"

First Run Experience

If this is your first time using cadstack, follow this sequence:

text

Step 1: Verify setup
┌─────────────────────────────────────────┐
│ /cad-config                             │
│                                         │
│ ✓ FreeCAD: available                    │
│ ✓ Output dir: ~/.claude/.../output      │
│ ✓ Default format: STEP                  │
└─────────────────────────────────────────┘

Step 2: Hello World (builds confidence)
┌─────────────────────────────────────────┐
│ /cad "create a 10mm cube"               │
│                                         │
│ ✓ Created: output/cube.step (2.1 KB)    │
│   Dimensions: 10 × 10 × 10 mm           │
└─────────────────────────────────────────┘

Step 3: Your first real part
┌─────────────────────────────────────────┐
│ /cad "create a 50×30×5mm plate with     │
│       four 5mm holes at corners"        │
└─────────────────────────────────────────┘

User Journey Storyboard

Step	User Action	User Feels	Skill Supports It
1	Install cadstack	Uncertain: "Will this work?"	/cad-config verifies setup
2	Create first cube	Relieved: "It works!"	Simple 10mm cube example
3	Create real part	Curious: "What else can I do?"	Examples in /cad skill
4	Complex operation	Confident but cautious	/cad-plan for structure
5	Verify output	Certain: "It's correct"	/cad-qa confirms dimensions
6	Error occurs	Frustrated	Minimal error → recovery command
7	Fix and retry	Satisfied	Clear path forward

Architecture

text

cadstack/
├── SKILL.md                 # This file
├── setup                    # Installation script
├── skills/                  # Skill definitions
│   ├── cad.md
│   ├── cad-plan.md
│   ├── cad-review.md
│   ├── cad-qa.md
│   └── cad-config.md
├── lib/                     # Core library
│   ├── cad_executor.py      # Script executor
│   ├── backends/            # Platform backends
│   └── utils/               # Helpers
└── templates/               # Script templates

Configuration

Add to your project's CLAUDE.md:

markdown

## cadstack
Available skills: /cad, /cad-plan, /cad-review, /cad-qa, /cad-config
Supported platforms: FreeCAD, AutoCAD, SolidWorks, Fusion 360
Default platform: freecad