Do I need AutoCAD LT installed to use this server?
Only for the File IPC backend. The ezdxf backend works on any platform without AutoCAD.
AutoCAD LT AutoLISP MCP Server
@puran-water
基本情報
AutoCAD LT AutoLISP MCP Server について
MCP server for AutoCAD LT v3.1: freehand AutoLISP execution, 8 consolidated tools, File IPC + ezdxf backends, focus-free dispatch, undo/redo, P&ID symbols, and robust IPC with ESC prefix and UTF-8 fallback. Companion agent skill: puran-water/autocad-drafting
AutoCAD LT AutoLISP MCP Server の設定
AutoCAD LT AutoLISP MCP Server のツール
ツール一覧はまだありません
この掲載には表示できるツール一覧がまだありません。サーバーにツールがないという意味ではありません。対応機能はプロジェクトのドキュメントをご確認ください。
ツールは README から自動的に抽出されます。メンテナーは ## Tools という見出しの下に記載することで、このタブに反映できます。
概要
What is AutoCAD LT AutoLISP MCP Server?
An MCP server that automates AutoCAD LT and generates DXF files headless. It provides two backends—File IPC (requires AutoCAD LT 2024+ on Windows) and ezdxf (any platform, no AutoCAD needed)—and exposes 8 consolidated tools over the MCP stdio transport, enabling an MCP client to drive AutoCAD through natural-language requests.
How to use AutoCAD LT AutoLISP MCP Server?
Clone the repository, install dependencies with uv sync, load mcp_dispatch.lsp in AutoCAD LT via APPLOAD, then configure your MCP client (e.g., Claude Desktop) with the command pointing to the Python interpreter in the project venv. Set the AUTOCAD_MCP_BACKEND environment variable to auto, file_ipc, or ezdxf. Verify by calling system(operation="status") from the client.
Key features of AutoCAD LT AutoLISP MCP Server
- Two backends: File IPC (AutoCAD LT required) and ezdxf (headless, any platform)
- 8 consolidated tools: drawing, entity, layer, block, annotation, pid, view, system
- Focus‑free automation: sends keystrokes without stealing window focus
- Arbitrary AutoLISP execution via
execute_lisp - Headless DXF generation with matplotlib rendering
- Screenshot capture even when AutoCAD is minimized
Use cases of AutoCAD LT AutoLISP MCP Server
- Automate drawing creation and modification in AutoCAD LT using natural language
- Generate DXF files headless on any platform (Linux, macOS, WSL)
- Insert P&ID symbols from the CAD Tools Online library
- Manage layers, blocks, and annotations programmatically
- Run custom AutoLISP scripts through the MCP interface
よくある質問
Can I use the File IPC backend on macOS?
No. AutoLISP support in AutoCAD LT is Windows‑only (LT 2024+). AutoCAD LT for Mac does not support AutoLISP.
How does the server communicate with AutoCAD?
The File IPC backend writes JSON commands to a shared directory (default `C:/temp`) and sends keystrokes to AutoCAD’s MDIClient window via `PostMessageW(WM_CHAR)`, triggering the `(c:mcp-dispatch)` AutoLISP command.
Which MCP transport does this server use?
Stdio (JSON‑RPC). No authentication is described.
Does the ezdxf backend support all operations?
No. Operations such as `offset`, `fillet`, `chamfer`, `plot_pdf`, undo/redo, and some P&ID operations are File IPC only.
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