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# AutoCAD LT AutoLISP MCP Server
This MCP server enables natural language control of AutoCAD LT 2024/2025 through AutoLISP code generation and execution. It bridges Claude or other LLM clients with AutoCAD LT for creating engineering drawings through conversational prompts.
## Features
- Generates and executes AutoLISP code in AutoCAD LT
- Creates basic shapes (lines, circles, polylines, text)
- Handles block insertion with attribute management
- Supports connecting blocks with lines between named connection points
- Arranges multiple blocks in sequence with custom spacing
- Provides robust layer creation and management
- Creates hatches and dimensions for technical drawings
- Allows entity rotation and manipulation
- Supports direct custom AutoLISP code execution
- Enables text-to-CAD functionality through natural language
## Prerequisites
- AutoCAD LT 2024 or newer (with AutoLISP support)
- Python 3.10 or higher
- Claude Desktop or other MCP client application
## Setup Instructions
1. **Install Dependencies**:
```
git clone https://github.com/hvkshetry/autocad-mcp.git
cd autocad-mcp
python -m venv venv
venv\Scripts\activate
pip install -r requirements.txt
```
2. **Configure Claude Desktop**:
- Open Claude Desktop settings
- Edit the configuration file to include:
```json
{
"mcpServers": {
"autocad-lisp": {
"command": "path\\to\\autocad-mcp\\venv\\Scripts\\python.exe",
"args": ["path\\to\\autocad-mcp\\server_lisp.py"]
}
}
}
```
- Alternatively, you can use the included `claude_desktop_config_lisp.json` as a template
3. **Start AutoCAD LT**:
- Launch AutoCAD LT
- Create or open a drawing
- Ensure the AutoCAD window title includes "AutoCAD" and the drawing name (".dwg")
4. **Start the Server**:
- Run `start_lisp_server.bat` as Administrator
- Alternatively, use `restart_fixed_server.bat` if you encounter issues with LISP loading
5. **Test the Connection**:
- Run `test_connection.bat` to verify proper functionality
## Available Tools
- `get_autocad_status`: Check connection to AutoCAD
- `create_line`: Draw a line between two points
- `create_circle`: Create a circle with defined center and radius
- `create_text`: Add text labels at specified coordinates
- `insert_block`: Insert a block with optional ID attribute, scale, and rotation
- `connect_blocks`: Connect two blocks with a line between named connection points
- `label_block`: Add a text label to a block
- `arrange_blocks`: Arrange multiple blocks in a sequence with custom spacing
- `create_polyline`: Create a polyline from a series of points
- `create_rectangle`: Create a rectangle using two opposite corners
- `create_arc`: Create an arc from center, radius and start/end angles
- `create_ellipse`: Create an ellipse with major axis and ratio
- `create_mtext`: Add multiline text with width and optional formatting
- `create_wipeout_from_points`: Create a wipeout mask from a list of points
- `move_last_entity`: Move the most recently created entity by a delta
- `rotate_entity_by_id`: Rotate an entity around a base point
- `create_linear_dimension`: Add a linear dimension between two points
- `create_hatch`: Add hatching to a closed polyline area
- `set_layer_properties`: Create or modify layers with color, linetype, lineweight, etc.
- `execute_custom_autolisp`: Run custom AutoLISP code directly
## LISP Library Structure
The server loads multiple LISP files for functionality:
1. **error_handling.lsp**: Base error handling and validation functions
2. **basic_shapes.lsp**: Core functions for creating lines, circles, and text
3. **drafting_helpers.lsp**: Functions for block manipulation, layer management, and connecting elements
4. **block_id_helpers.lsp**: Functions for finding and manipulating blocks by ID attribute
5. **selection_and_file.lsp**: Selection set management and file operations
6. **advanced_geometry.lsp**: Extended geometry creation and manipulation
7. **advanced_entities.lsp**: Rectangle, arc, ellipse, mtext, and wipeout helpers
8. **entity_modification.lsp**: Basic entity modification commands
9. **annotation_helpers.lsp**: Text and dimension creation tools
10. **layout_management.lsp**: Functions for managing layouts and viewports
## Usage Examples
1. **Basic Drawing Operations**:
- "Draw a line from coordinates (100,100) to (200,150)"
- "Create a circle at (150,150) with radius 25"
- "Add text 'System Title' at position (100,200)"
- "Create a polyline with points at (10,10), (50,50), (100,10) and close it"
2. **Block Operations**:
- "Insert a block named 'PUMP' at position (100,100) with ID 'P-101'"
- "Label the block with ID 'P-101' as 'Feed Pump'"
- "Connect block 'P-101' to 'V-201' on the 'Piping' layer"
- "Rotate the block 'P-101' by 45 degrees around its insertion point"
3. **Multi-Block Operations**:
- "Arrange blocks 'PUMP', 'VALVE', and 'TANK' starting at (50,100) going right with 30 units spacing"
- "Create a layer named 'Equipment' with color 'yellow'"
- "Add a dimension between the two blocks showing the distance"
4. **Advanced Operations**:
- "Create a closed polyline and add ANSI31 hatching inside it"
- "Create a dimension showing the diameter of the circle"
- "Set the current layer to 'Dimensions' with color 'cyan' and lineweight '0.30mm'"
5. **Custom AutoLISP**:
- "Execute this AutoLISP code to create a custom function: (defun c:my-function ...)"
## Limitations
- Requires AutoCAD LT 2024 or newer with AutoLISP support
- Relies on window focus and keyboard simulation for command execution
- User should not interact with AutoCAD while commands are being sent
- Limited to 2D drawing operations
- Connection points for blocks use predefined connection point names (CONN_DEFAULT1, CONN_DEFAULT2)
- Layer colors must be specified as strings (e.g., "red", "yellow", "120")
## Recent Fixes
- Improved AutoCAD window detection so the server works even if the title only shows the drawing file name.
- Corrected the `insert_block` command construction which previously missed a space between scale and rotation values.
## Troubleshooting
See the [TROUBLESHOOTING.md](TROUBLESHOOTING.md) file for common issues and solutions. Common issues include:
- LISP files failing to load
- Window focus issues with AutoCAD
- Function cancelled errors
- Communication problems between the server and AutoCAD
## License
MIT
## Contributing
Contributions are welcome! Please feel free to submit a Pull Request.
