AutoCAD LT AutoLISP MCP Server

The AutoCAD LT AutoLISP 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, 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 layer creation and management
• Allows direct custom AutoLISP code execution
• Supports 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:

bash git clone https://github.com/your-username/autocad-mcp.git cd autocad-mcp python -m venv venv venv\Scripts\activate pip install -r requirements.txt

1. Configure Claude Desktop:

2. Open Claude Desktop settings

3. 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"] } } }

1. Start AutoCAD LT:

2. Launch AutoCAD LT

3. Create or open a drawing

4. Make sure the window title contains "AutoCAD LT" and "Drawing"

5. Start the Server:

6. Run start_lisp_server.bat as Administrator

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
• set_layer_properties: Create or modify layers with color and linetype
• 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. annotation_helpers.lsp: Text and dimension creation tools
8. layout_management.lsp: Functions for managing layouts and viewports

Usage Examples

1. Basic Drawing Operations:
2. "Draw a line from coordinates (100,100) to (200,150)"
3. "Create a circle at (150,150) with radius 25"

4. "Add text 'System Title' at position (100,200)"

5. Block Operations:

6. "Insert a block named 'PUMP' at position (100,100) with ID 'P-101'"
7. "Label the block with ID 'P-101' as 'Feed Pump'"

8. "Connect block 'P-101' to 'V-201' on the 'Piping' layer"

9. Multi-Block Operations:

10. "Arrange blocks 'PUMP', 'VALVE', and 'TANK' starting at (50,100) going right with 30 units spacing"

11. "Create a layer named 'Equipment' with color 'yellow'"

12. Custom AutoLISP:

13. "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 are currently hard-coded (pointA, pointB)

Troubleshooting

See the TROUBLESHOOTING.md file for common issues and solutions.

License

MIT

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

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AutoCAD LT AutoLISP MCP Server

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• Common Lisp 53.8%
• Python 41.0%
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