puran-water/autocad-mcp

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Summary

autocad-mcp is an MCP server for AutoCAD LT v3.1 that enables freehand AutoLISP execution, 8 consolidated tools, File IPC and ezdxf backends, focus-free dispatch, undo/redo, P&ID symbols, and robust IPC with ESC prefix and UTF-8 fallback. It pairs with the companion agent skill puran-water/autocad-drafting.

Key features

• Freehand AutoLISP execution
• 8 consolidated tools
• File IPC and ezdxf backends
• Focus-free dispatch
• Undo/redo support
• P&ID symbols and robust IPC with ESC prefix and UTF-8 fallback

Use cases

• Automate AutoCAD LT drafting tasks via MCP
• Execute custom AutoLISP scripts without manual focus
• Integrate P&ID symbol insertion into workflows
• Leverage undo/redo for iterative design changes
• Use File IPC or ezdxf for flexible data exchange

README excerpt

# AutoCAD MCP Server MCP server for AutoCAD LT automation and headless DXF generation. Two backends, one API: | Backend | Runtime | Requires AutoCAD? | Screenshot | |---------|---------|-------------------|------------| | **File IPC** | Windows Python | Yes — AutoCAD LT 2024+ (Windows) | Win32 PrintWindow | | **ezdxf** | Any platform | No (headless) | matplotlib render | The server exposes **8 consolidated tools** (`drawing`, `entity`, `layer`, `block`, `annotation`, `pid`, `view`, `system`) over the MCP stdio transport. An MCP client (Claude Desktop, Claude Code, etc.) connects and drives AutoCAD through natural-language requests. ## Prerequisites (File IPC backend) - **Windows 10/11** (the File IPC backend uses Win32 APIs for focus-free window messaging) - **AutoCAD LT 2024 or newer** — AutoLISP support was added in LT 2024 for Windows. AutoCAD LT for Mac exists but does **not** support AutoLISP. - **Python 3.10+** (Windows native — not WSL Python) - **uv** package manager ([install guide](https://docs.astral.sh/uv/getting-started/installation/)) > The ezdxf headless backend works on any platform (Linux, macOS, WSL) for offline DXF generation without AutoCAD installed. ## Quick Start ### 1. Clone and install ```powershell git clone https://github.com/puran-water/autocad-mcp.git cd autocad-mcp uv sync ``` ### 2. Load the LISP dispatcher in AutoCAD LT Open AutoCAD LT and load `mcp_dispatch.lsp` using **APPLOAD**: 1. Type `APPLOAD` in the AutoCAD command line 2. Browse to `<repo>/lisp-code/mcp_dispatch.lsp` 3. Click **Load** 4. You should see: `=== MCP Dispatch v3.1 loaded ===` and `Ready for commands via (c:mcp-dispatch)` > **Tip:** Add the file to your AutoCAD Startup Suite (in the APPLOAD dialog) so it loads automatically with every drawing. ### 3. Conf

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