AutoCAD MCP Server

- Parameters:x1,y1,x2,y2

- Returns: Object ID of created line

- Parameters:center_x,center_y,radius

- Returns: Object ID of created circle

- Parameters:x,y,width,height

- Returns: List of object IDs (polyline + entities)

- Parameters:text,x,y,height

- Returns: Object ID of created text
- create_layer- Create a new layer

- Parameters:layer_name

- Returns: Layer name (or error if exists)

- No parameters

- Returns: List of layer names
- calculate_area- Calculate area of closed shape

- Parameters:object_id

- Returns: Calculated area value
- save_drawing- Save active drawing

- Parameters:file_path(optional, defaults to current)

- Returns: Success message with file path

- Parameters:output_path

- Returns: Success message with PDF path

- No parameters

- Returns: Document name and full path

- Windows 10/11(AutoCAD COM API is Windows-only)
- AutoCAD 2020+installed and running
- Python 3.11+with pip
- uvpackage manager (recommended)

git clone https://github.com/yourusername/autocad-mcp-server.git cd autocad-mcp-server

python -m venv venv venv\Scripts\activate pip install -r requirements.txt

After installing pywin32, register COM components:

python -m pip install --upgrade pywin32 python Scripts/pywin32_postinstall.py -install

uv run python -m pip install --upgrade pywin32 uv run python Scripts/pywin32_postinstall.py -install

# Test that AutoCAD COM is accessible python -c "import win32com.client; acad = win32com.client.GetObject(class='AutoCAD.Application'); print(f'AutoCAD {acad.Version} detected')"

The server connects to a running AutoCAD instance via COM:

# Start AutoCAD before running the MCP server # AutoCAD will be running in the background

2. Enable COM Automation (Usually Default)

AutoCAD COM is enabled by default. To verify:
- Open AutoCAD
- Go toTools→Options→System
- Ensure "OLE Support" isenabled

Create a.envfile (copy from.env.example):

# AutoCAD connection timeout in seconds AUTOCAD_TIMEOUT=10 # Connection retry attempts RETRY_ATTEMPTS=3 # Logging level: DEBUG, INFO, WARNING, ERROR LOG_LEVEL=INFO # Server host and port MCP_HOST=127.0.0.1 MCP_PORT=8000

# Terminal 1: Start AutoCAD (if not already running) # Open AutoCAD manually # Terminal 2: Start MCP server python -m src.server

- Detect running AutoCAD instance
- Register all tools with MCP
- Listen for tool calls
- Reconnect if AutoCAD restarts

When running locally, the server is available at:

Edit~/.config/Claude/claude_desktop_config.json(Windows):

Issue: AutoCAD crashes or becomes unresponsive

# Run all tests pytest # Run with coverage pytest --cov=src # Run specific test file pytest tests/test_models.py # Run with verbose output pytest -v

- ✅ Pydantic model validation
- ✅ Tool parameter validation
- ✅ AutoCAD connection logic
- ✅ API endpoint functionality
- ✅ Error handling and edge cases

autocad-mcp-server/ ├── src/ │ ├── __init__.py │ ├── server.py # MCP server entrypoint │ ├── autocad_client.py # AutoCAD COM wrapper │ ├── models.py # Pydantic validation models │ └── tools/ │ ├── __init__.py # Tool registry │ ├── drawing.py # Line, circle, rectangle, text │ ├── layers.py # Layer management │ ├── dimensions.py # Area calculation │ └── export.py # Save and PDF export ├── tests/ │ ├── test_models.py # Model validation tests │ ├── test_server.py # API endpoint tests │ └── test_tools.py # Tool handler tests ├── pyproject.toml # uv/pip dependencies ├── .env.example # Environment template └── README.md # This file

┌─────────────────────────────────────────┐ │ Claude Desktop / ChatGPT / etc │ └──────────────────┬──────────────────────┘ │ │ (MCP Protocol) │ ┌──────────────────▼──────────────────────┐ │ MCP Server (FastMCP) │ │ ├─ Tool Registry │ │ ├─ Request Dispatcher │ │ └─ Pydantic Validators │ └──────────────────┬──────────────────────┘ │ │ (Python API) │ ┌──────────────────▼──────────────────────┐ │ AutoCAD Client (pyautocad) │ │ ├─ Connection Manager │ │ ├─ Retry Logic │ │ └─ Error Handler │ └──────────────────┬──────────────────────┘ │ │ (COM Automation) │ ┌──────────────────▼──────────────────────┐ │ AutoCAD Application (COM) │ │ ├─ Drawing API │ │ ├─ Layer Management │ │ └─ Document Operations │ └─────────────────────────────────────────┘

- Fast- Direct COM calls, no network overhead
- Lightweight- Minimal dependencies
- Reliable- Auto-reconnection on AutoCAD restart
- Safe- Full input validation with Pydantic
- Concurrent- Handles multiple AI assistant requests

- ✅ Runs locally on Windows (no cloud exposure)
- ✅ Input validation on all tool parameters
- ✅ Type-safe with Pydantic models
- ✅ Error handling prevents information leakage
- ⚠️ AutoCAD file access - ensure proper file permissions
- ⚠️ When exposing via network, use authentication/TLS

Pull requests welcome! Areas for enhancement:

- Additional drawing primitives (arc, polyline, spline)
- Block/component support
- Dimension annotations
- Hatch patterns
- Custom properties
- Multi-document support
- macOS/Linux via parallel AutoCAD alternatives

- Initial release
- 10 core CAD tools
- Claude Desktop integration
- Full test coverage
- Production-ready code

- AutoCAD Web API support for cloud deployments
- Real-time drawing updates with WebSocket
- Advanced geometry operations (offset, trim, extend)
- Material/property management
- CAM integration
- Version control for drawing changes

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