FreeCAD MCP servers and AI agent skills

How AI connects to FreeCAD

An MCP server or skill can only do what FreeCAD lets programs do. FreeCAD exposes 2 automation interfaces:

• FreeCAD Python API (Python): Almost everything in FreeCAD is reachable from its bundled Python, through the FreeCAD (App) and FreeCADGui modules, and the MCP servers here mostly forward Python into a running session. Mind the two interpreters: the addon runs inside FreeCAD's own Python (3.11 on some builds), while the external MCP server often needs 3.12 or later, so don't install server packages into FreeCAD's Python. Macros (.FCMacro files) are the same Python saved for reuse. Documentation
• Headless FreeCAD (freecadcmd) (Command line): freecadcmd runs FreeCAD without its GUI, which suits batch exports and heavy OpenCascade operations such as sweeps, lofts and big booleans that can crash or freeze the interface. One listed server sends such scripts to a separate freecadcmd process so a crash doesn't cost you open documents; another can import FreeCAD into its own process on Linux only. Documentation

What Open source offers

FreeCAD is developed by an open-source community rather than a software vendor, and the project has announced no AI assistant or MCP server of its own. Its blog, checked on 4 November 2026, covered the FreeCAD 26.3 release candidates and grant-funded work, with no AI integration. All FreeCAD MCP servers and AI workbenches listed here are independent community projects distributed as addons.

Checked 4 Nov 2026. Sources: FreeCAD news blog

What you can do with FreeCAD and AI

• Model a part such as a flange or bracket from a description, creating and editing objects in an open document and returning a screenshot after each change.
• Run a CalculiX FEM analysis on an existing FreeCAD analysis container and report peak von Mises stress and displacement.
• Send long OpenCascade operations, such as threaded sweeps or large booleans, to a headless freecadcmd process, then reload the saved file in the GUI.
• Insert standard parts from the FreeCAD parts library, then export STEP or STL.
• Diagnose a failed Pad or a broken external link by reading the Report View and sketch constraints.
• Generate CNC toolpaths and G-code through the CAM workbench (with a current development build).

Taken from the listings' own documentation. Check each listing for exactly what it supports.

Installing

The listings here document setup for Claude Code, Claude Desktop, Codex and Cursor. Install steps, copied from each project's own documentation, are on each listing's page. Most FreeCAD integrations run on your own computer next to FreeCAD, so you need FreeCAD installed and licensed on the same machine unless the listing says otherwise.