AutoCAD MCP Server - Complete Documentation

🏗️ A powerful Python-based Model Context Protocol (MCP) server that provides programmatic control over AutoCAD through COM automation.

Youtube video of the working demo https://www.youtube.com/watch?v=KQpxiXvF4cc

Transform your AutoCAD workflow with intelligent building structure creation, automatic layer management, and comprehensive entity manipulation - all through Claude and other MCP clients.

🚀 Quick Start (30 seconds)

# 1. Clone and setup
git clone https://github.com/yourusername/autocad-mcp-server
cd autocad-mcp-server
pip install -e .

# 2. Start AutoCAD (must be running)
# Open AutoCAD application

# 3. Test the server
python test_script.py

📋 Table of Contents

• Prerequisites

• Installation

• Configuration with Claude Desktop

• Running the Server

• Basic Usage Examples

• Advanced Features

• API Reference

• Troubleshooting

• Development

Prerequisites

System Requirements

• Operating System: Windows (COM automation requirement)

• AutoCAD: Any version 2000+ with COM support

• Python: 3.8 or higher

• Claude Desktop: Latest version (for MCP integration)

Required Software

1. AutoCAD Installation

   • Any AutoCAD version (AutoCAD, AutoCAD LT, Civil 3D, etc.)

   • Must have valid license and be able to run

   • COM automation must be enabled (default in most installations)

2. Python Environment

   • Python 3.8+ installed

   • Administrative privileges may be required for COM registration

Installation

Method 1: Using pip (Recommended)

# Clone the repository
git clone https://github.com/yourusername/autocad-mcp-server
cd autocad-mcp-server

# Create virtual environment
python -m venv venv

# Activate environment (Windows)
venv\Scripts\activate

# Install the package
pip install -e .

Method 2: Using uv (Faster)

# Install uv if not already installed
pip install uv

# Clone and setup
git clone https://github.com/yourusername/autocad-mcp-server
cd autocad-mcp-server

# Create environment and install
uv venv
uv pip install -e .

Dependencies Installed

• mcp>=1.0.0 - Model Context Protocol framework

• pywin32>=306 - Windows COM automation

Configuration with Claude Desktop

Step 1: Locate Claude Desktop Config

Find your Claude Desktop configuration file:

• Windows: %APPDATA%\Claude\claude_desktop_config.json

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

Step 2: Add MCP Server Configuration

Edit the config file to include your AutoCAD MCP server:

{
  "mcpServers": {
    "autocad-mcp": {
      "command": "python",
      "args": [
        "C:\\path\\to\\your\\autocad-mcp-server\\test_script.py"
      ],
      "env": {
        "PYTHONPATH": "C:\\path\\to\\your\\autocad-mcp-server"
      }
    }
  }
}

Important: Replace C:\\path\\to\\your\\autocad-mcp-server with your actual project path.

Step 3: Alternative Configuration (If Installed via pip)

If you installed the package globally:

{
  "mcpServers": {
    "autocad-mcp": {
      "command": "autocad-mcp",
      "args": []
    }
  }
}

Step 4: Restart Claude Desktop

1. Close Claude Desktop completely

2. Restart the application

3. Verify the MCP server appears in available tools

Running the Server

Method 1: Standalone Testing

# Activate your environment
venv\Scripts\activate  # Windows
# source venv/bin/activate  # macOS/Linux

# Start AutoCAD first (important!)
# Open AutoCAD application

# Run the test script
python test_script.py

Expected Output:

✅ Successfully connected to AutoCAD
📄 Drawing: Drawing1.dwg
📊 Entities: 0
🚀 MCP Server starting...
Server running and waiting for client connections...

Method 2: Through Claude Desktop

1. Start AutoCAD (must be running before Claude connects)

2. Open Claude Desktop

3. Start new conversation

4. Verify MCP connection - You should see "autocad-mcp" in available tools

5. Test with a simple command:

Hi! Can you check what AutoCAD drawing is currently open?

Method 3: Direct MCP Client

For advanced users or custom integrations:

import asyncio
from autocad_mcp import AutoCADCOMServer

async def run_server():
    server = AutoCADCOMServer()
    await server.main()

asyncio.run(run_server())

Basic Usage Examples

Through Claude Desktop

Once configured, you can use natural language with Claude to control AutoCAD:

Example 1: Check Drawing Status

Claude: Can you tell me about the current AutoCAD drawing?

Claude will use the MCP server to get drawing information and respond with details about the current drawing, layers, and entity count.

Example 2: Create a Simple Room

Claude: Create a 12x10 foot room with walls that are 6 inches thick. Add a door on the south wall and a window on the east wall.

Claude will:

• Create a room structure using create_structure

• Add walls with proper thickness

• Place door and window openings

• Use appropriate layers (WALLS, DOORS, WINDOWS)

• Label the elements

Example 3: Layer Management

Claude: Show me all the layers in the current drawing and create a new layer called "HVAC" with red color.

Example 4: Entity Querying

Claude: List all the entities in the drawing grouped by layer. How many walls do we have?

Direct API Usage (Advanced)

If you're building custom applications:

from autocad_mcp import AutoCADCOMServer

# Initialize server
server = AutoCADCOMServer()

# Connect to AutoCAD
if server.connect_to_autocad():
    
    # Create a wall
    result = server.create_structure(
        structure_type="wall",
        geometry_data={
            "start": [0, 0],
            "end": [20, 0]
        },
        thickness=0.5,
        label="North Wall"
    )
    
    # Create a door
    door_result = server.create_structure(
        structure_type="door", 
        geometry_data={
            "start": [8, 0],
            "end": [11, 0],
            "width": 3
        },
        label="Main Entrance"
    )
    
    # Get all entities
    entities = server.get_entities()
    print(f"Total entities: {entities['total_count']}")

Advanced Features

Intelligent Layer Management

The server automatically assigns structures to appropriate layers:

# Automatically goes to WALLS layer
create_structure("wall", geometry_data)

# Automatically goes to ELECTRICAL layer  
create_structure("outlet", geometry_data)

# Custom layer assignment
create_structure("furniture", geometry_data, custom_layer="BEDROOM_FURNITURE")

Thickness and Styling

# Wall with thickness (creates parallel lines with end caps)
create_structure("wall", {
    "start": [0, 0], 
    "end": [20, 0]
}, thickness=0.5, color="white")

# Circle with thickness (creates concentric circles)
create_circle([10, 10], 5, color="red", thickness=0.2)

Batch Operations

# Get all entities
entities = get_entities()

# Delete by criteria
delete_entities_by_layer("TEMP_LAYER")
delete_entities_by_color("red")
delete_entities_by_type("AcDbText")

# Modify existing entities
for entity in entities['entities']:
    if entity['type'] == 'AcDbLine':
        change_entity_color(entity['handle'], 'blue')

Structure Labeling

# Create room with automatic labeling
create_structure("room", {
    "corner1": [0, 0],
    "corner2": [12, 8]
}, label="Living Room", thickness=0.25)

# Labels automatically go to ANNOTATION layer

API Reference

Core Information Tools

get_drawing_info()

Purpose: Get comprehensive drawing information Returns: Drawing metadata, layer info, entity counts

{
  "filename": "floor_plan.dwg",
  "path": "C:\\Projects\\floor_plan.dwg", 
  "entity_count": 150,
  "saved": true,
  "current_layer": "WALLS",
  "total_layers": 8,
  "available_layers": [...]
}

get_entities(max_entities?)

Purpose: Retrieve all entities with layer grouping Parameters:

• max_entities (optional): Limit number of entities returned

Returns: Complete entity list with metadata

{
  "entities": [...],
  "entities_by_layer": {
    "WALLS": [25 entities],
    "DOORS": [8 entities]
  },
  "total_count": 150,
  "layer_summary": {"WALLS": 25, "DOORS": 8}
}

Structure Creation

create_structure(type, geometry, options)

Purpose: Create intelligent building structures Parameters:

• structure_type: "wall", "door", "window", "room", "furniture", etc.

• geometry_data: Geometry definition

• color (optional): Override default layer color

• thickness (optional): Structure thickness

• custom_layer (optional): Custom layer name

• label (optional): Text label

Examples:

# Wall
create_structure("wall", {
    "start": [0, 0], "end": [20, 0]
}, thickness=0.25, label="Exterior Wall")

# Room  
create_structure("room", {
    "corner1": [0, 0], "corner2": [12, 10]
}, label="Master Bedroom")

# Door with swing
create_structure("door", {
    "start": [8, 0], "end": [11, 0], "width": 3
}, label="Front Door")

Basic Entity Creation

create_line(start, end, color?, thickness?)

create_line([0, 0], [10, 0], "red", 0.1)

create_circle(center, radius, color?, thickness?)

create_circle([5, 5], 3, "blue", 0.05)

create_rectangle(corner1, corner2, color?, thickness?)

create_rectangle([0, 0], [10, 8], "green", 0.0)

create_text(position, text, height?, color?)

create_text([5, 5], "Room Label", 0.5, "black")

create_arc(center, radius, start_angle, end_angle, color?, thickness?)

create_arc([0, 0], 5, 0, 90, "cyan", 0.0)

Layer Management

create_or_get_layer(name, color?, description?)

create_or_get_layer("CUSTOM_LAYER", "yellow", "Custom elements")

set_current_layer(name)

set_current_layer("WALLS")

Entity Deletion

delete_entity_by_handle(handle)

delete_entity_by_handle("ABC123")

delete_entities_by_layer(layer_name)

delete_entities_by_layer("TEMP_LAYER")

delete_entities_by_type(entity_type)

delete_entities_by_type("AcDbText")  # Delete all text

delete_entities_by_color(color)

delete_entities_by_color("red")

delete_last_entities(count?)

delete_last_entities(5)  # Delete last 5 entities

Utility Tools

undo_last_operation()

undo_last_operation()  # Ctrl+Z equivalent

change_entity_color(handle, color)

change_entity_color("ABC123", "blue")

zoom_extents()

zoom_extents()  # Zoom to show all objects

Predefined Layer System

Automatic Layer Assignment

The system intelligently assigns layers based on keywords:

structure_mapping = {
    "wall", "partition" → "WALLS",
    "door", "opening" → "DOORS", 
    "window" → "WINDOWS",
    "furniture", "chair", "table", "bed" → "FURNITURE",
    "outlet", "switch", "light" → "ELECTRICAL",
    "toilet", "sink", "pipe" → "PLUMBING",
    "vent", "duct", "hvac" → "HVAC",
    "beam", "column" → "STRUCTURE",
    "text", "dimension" → "ANNOTATION"
}

Real-World Examples

Example 1: Complete Floor Plan with Claude

User to Claude:

Create a simple apartment floor plan:
- 20x15 foot room with 6-inch walls
- Front door (3 feet wide) on the south wall, centered
- Two windows (4 feet each) on the east and west walls
- Kitchen area in the northwest corner (8x6 feet)
- Add labels for each area

Claude's Response Process:

1. Uses create_structure("room", ...) for main room

2. Uses create_structure("door", ...) for entrance

3. Uses create_structure("window", ...) for windows

4. Uses create_structure("room", ...) for kitchen

5. Uses create_text(...) for labels

6. Uses zoom_extents() to show complete drawing

Example 2: Layer Management Workflow

User to Claude:

I need to organize my drawing. Can you:
1. Show me all current layers and their entity counts
2. Move all red entities to a new "HIGHLIGHTED" layer
3. Delete everything on the "TEMP" layer
4. Change all text to be green colored

Claude's Process:

1. get_entities() to analyze current state

2. create_or_get_layer("HIGHLIGHTED", "red")

3. Filter entities by color, move to new layer

4. delete_entities_by_layer("TEMP")

5. change_entity_color() for all text entities

Example 3: Electrical Layout

User to Claude:

Add electrical outlets and switches to this room:
- Outlets every 8 feet along the walls
- Light switches by each door
- Ceiling light in the center
- Put everything on the electrical layer with proper labels

Claude's Process:

1. get_entities() to find existing walls and doors

2. Calculate outlet positions along walls

3. create_structure("outlet", ...) for each outlet

4. create_structure("switch", ...) by doors

5. create_structure("light", ...) at room center

6. All automatically go to ELECTRICAL layer

Troubleshooting

Common Issues and Solutions

❌ "Not connected to AutoCAD"

Symptoms:

• Error messages about AutoCAD connection

• Server fails to start

Solutions:

1. Start AutoCAD First

   # Always start AutoCAD before the MCP server
   # Open AutoCAD application manually

2. Check AutoCAD Installation

   # Verify AutoCAD is installed and licensed
   # Try opening AutoCAD manually

3. Administrative Privileges

   # Run command prompt as Administrator
   # Try running the server with elevated privileges

4. COM Registration Issues

   # Re-register AutoCAD COM components
   # Run as Administrator:
   regsvr32 "C:\Program Files\Autodesk\AutoCAD 202X\acad.exe" /regserver

❌ Claude Desktop Not Connecting

Symptoms:

• MCP server not appearing in Claude

• Tools not available

Solutions:

1. Check Configuration Path

   // Verify paths in claude_desktop_config.json are correct
   {
     "mcpServers": {
       "autocad-mcp": {
         "command": "python",
         "args": ["C:\\CORRECT\\PATH\\test_script.py"]
       }
     }
   }

2. Restart Claude Desktop

   • Close Claude completely (check system tray)

   • Restart the application

   • Wait for full initialization

3. Check Python Environment

   # Verify Python and dependencies are accessible
   python -c "import mcp; print('MCP available')"
   python -c "import win32com.client; print('COM available')"

4. Test Server Standalone

   # Test the server works independently
   python test_script.py

❌ COM Timeout Errors

Symptoms:

• Operations taking too long

• "COM operation timed out" errors

Solutions:

1. Close Unnecessary AutoCAD Drawings

   • Keep only one drawing open

   • Close large/complex drawings

2. Increase Delay Parameters

   # In server.py, increase delay in safe_operation
   def safe_operation(self, operation_func, delay: float = 2.0):  # Increased delay

3. Process in Smaller Batches

   # For large operations, break into smaller chunks
   entities = get_entities(max_entities=100)  # Limit batch size

❌ Layer Creation Issues

Symptoms:

• Layers not being created

• "Layer already exists" errors

Solutions:

1. Check Drawing Permissions

   • Ensure drawing is not read-only

   • Save the drawing first

2. Verify Layer Names

   # Use valid layer names (no special characters)
   create_or_get_layer("VALID_LAYER_NAME", "white")

3. Layer Naming Conflicts

   • Check for existing layers with same name

   • Use unique layer names

❌ Performance Issues

Symptoms:

• Slow response times

• High memory usage

• AutoCAD becomes unresponsive

Solutions:

1. Optimize Entity Queries

   # Use max_entities for large drawings
   entities = get_entities(max_entities=500)
   
   # Query specific layers instead of all entities
   delete_entities_by_layer("TARGET_LAYER")

2. Batch Operations

   # Group similar operations together
   handles = ["handle1", "handle2", "handle3"]
   delete_entities_by_handles(handles)  # Batch delete

3. AutoCAD Settings

   • Turn off automatic save during operations

   • Disable visual effects/animations

   • Close unnecessary AutoCAD palettes

Debugging Tips

Enable Verbose Logging

# Add to test_script.py for debugging
import logging
logging.basicConfig(level=logging.DEBUG)

# Add debug prints in operations
print(f"DEBUG: Operation started - {operation_name}")

Test Individual Components

# Test AutoCAD connection separately
from autocad_mcp import AutoCADCOMServer
server = AutoCADCOMServer()
print(f"Connection: {server.connect_to_autocad()}")

# Test specific operations
result = server.create_line([0,0], [10,0])
print(f"Line creation: {result}")

Monitor AutoCAD State

# Check AutoCAD responsiveness
info = server.get_drawing_info()
print(f"AutoCAD responsive: {'error' not in info}")

Development

Extending the Server

Adding New Structure Types

1. Define Layer Mapping

# Add to layer_definitions in server.py
self.layer_definitions["custom_type"] = {
    "name": "CUSTOM_LAYER", 
    "color": "yellow", 
    "description": "Custom structure type"
}

2. Create Structure Method

def create_custom_structure(self, geometry_data, color="yellow", thickness=0.0):
    """Create custom structure"""
    # Implementation here
    pass

3. Add to Structure Mapping

# Add to get_layer_for_structure_type method
if "custom" in structure_type_lower:
    return "CUSTOM_LAYER"

4. Update MCP Tools

# Add to setup_tools method
types.Tool(
    name="create_custom_structure",
    description="Create custom structure type",
    inputSchema={...}
)

Adding New Entity Properties

def create_line_with_custom_properties(self, start, end, **kwargs):
    """Enhanced line creation with custom properties"""
    line = self.create_line(start, end, kwargs.get('color', 'white'))
    
    # Add custom properties
    if 'lineweight' in kwargs:
        line.Lineweight = kwargs['lineweight']
    
    if 'linetype' in kwargs:
        line.Linetype = kwargs['linetype']
    
    return line

Testing

Unit Tests

# tests/test_server.py
import unittest
from autocad_mcp import AutoCADCOMServer

class TestAutoCADServer(unittest.TestCase):
    def setUp(self):
        self.server = AutoCADCOMServer()
    
    def test_connection(self):
        result = self.server.connect_to_autocad()
        self.assertTrue(result)
    
    def test_layer_creation(self):
        result = self.server.create_or_get_layer("TEST_LAYER")
        self.assertTrue(result)

Integration Tests

# Test complete workflows
def test_room_creation_workflow():
    server = AutoCADCOMServer()
    
    # Create room
    result = server.create_structure("room", {
        "corner1": [0, 0],
        "corner2": [10, 10]
    }, label="Test Room")
    
    assert result["success"]
    
    # Verify entities created
    entities = server.get_entities()
    assert entities["total_count"] > 0

Performance Optimization

For Large Drawings

# Batch processing for large operations
def process_large_dataset(self, data_list, batch_size=100):
    """Process large datasets in batches"""
    for i in range(0, len(data_list), batch_size):
        batch = data_list[i:i+batch_size]
        self.process_batch(batch)
        time.sleep(0.1)  # Prevent COM overload

Memory Management

# Clean up COM objects explicitly
def cleanup_com_objects(self):
    """Clean up COM references"""
    if self.doc:
        self.doc = None
    if self.acad_app:
        self.acad_app = None
    pythoncom.CoUninitialize()

Contributing

1. Fork the repository

2. Create feature branch: git checkout -b feature/new-feature

3. Add tests for new functionality

4. Update documentation

5. Submit pull request

Code Style

• Follow PEP 8 guidelines

• Use type hints where possible

• Add docstrings for all public methods

• Include error handling for COM operations

Testing Requirements

• All new features must include tests

• Maintain >90% code coverage

• Test with multiple AutoCAD versions if possible

FAQ

Q: Can I use this with AutoCAD LT?

A: Yes, AutoCAD LT supports COM automation and should work with this server.

Q: Does this work with other CAD software?

A: This server is specifically designed for AutoCAD's COM interface. Other CAD software would require different implementations.

Q: Can I run multiple instances?

A: You can connect to multiple AutoCAD instances, but each MCP server instance connects to one AutoCAD instance.

Q: Is this compatible with AutoCAD on Mac?

A: No, this uses Windows COM automation which is not available on Mac. AutoCAD for Mac uses a different architecture.

Q: Can I modify existing drawings?

A: Yes, the server can modify any drawing that AutoCAD can open, including reading entities, modifying properties, and adding new content.

Q: How do I handle coordinate systems?

A: The server uses AutoCAD's current coordinate system. All coordinates are in AutoCAD's current units (typically decimal units).

License

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.

Legal Notice

This software requires a valid AutoCAD license for operation. AutoCAD is a trademark of Autodesk, Inc. This project is not affiliated with or endorsed by Autodesk.

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