build123d-mcp

MCP serverCommunity

A build123d session server that lets the assistant model step by step, render, measure and export. By pzfreo.

141 starsUpdated 3 weeks agoGitHub data from 5 Nov 2026

At a glance

Type: MCP server
Works with: build123d
How it connects: Reads and writes files; the tool isn't needed
Access: Can modify models
Tool versions: Python 3.11 to 3.14
Operating systems: Not stated in its documentation
Needs a build123d licence: No
Transport: Local (stdio), Remote (HTTP)
AI clients documented: Claude Code, Claude Desktop, Cursor, VS Code, Continue, Cline, Codex
Licence: Apache-2.0
Language: Python

What it can do

Keeps a persistent build123d session so a part can be built in small, checked steps, with snapshots to save and restore.
Renders PNG, SVG and DXF previews and 2D drawing previews.
Measures volume, area, bounding boxes, topology and centre of mass, and finds holes, bosses and countersinks.
Checks printability and fit, imports STEP or STL for comparison, and exports STEP, STL, DXF and SVG.

Limitations

HTTP mode is for self-hosted deployments only.
Under active development.

Install

{
  "mcpServers": {
    "build123d-mcp": {
      "command": "uv",
      "args": ["tool", "run", "--python", "3.12", "build123d-mcp@latest"]
    }
  }
}

Source: github.com/pzfreo/build123d-mcp#claude-code

MCP servers and skills run code on your computer. Review the source before installing.

AI-generated models, drawings and results must be checked by a qualified engineer before use.