What is build123d-mcp?
build123d-mcp is a MCP server by pzfreo that create, inspect and iterate on 3D geometry with build123d parametric CAD: render PNG/SVG views, measure geometry and export STEP/STL. It is listed under Media & design and has 115 GitHub stars.
| Type | Mcp server |
|---|---|
| Author | pzfreo |
| Repository | pzfreo/build123d-mcp |
| Popularity | 115 GitHub stars |
| Category | Media & design |
| Security | Low risk (84/100) |
| Rank | #552 of 4,418 MCP servers; #33 in Media & design |
| License | Apache-2.0 |
| Last commit | 2026-10-15 |
| Stars this week | +3 |
| Runs | Locally |
| Language | Python |
| Platforms | macOS, Windows, Linux |
Is build123d-mcp safe to install?
build123d-mcp scores 84/100 on the MCPMods security check: Low risk. Things to review: can take actions such as send, write or deploy. It passed 4 of 6 checks.
MCP server results come from listing signals: who publishes it, where your data goes and what it can do. The code itself is not scanned yet.
| Check | Result |
|---|---|
| Community-built server | Note |
| Runs on your machine only | Pass |
| No credentials mentioned | Pass |
| Can take actions such as send, write or deploy | Review |
| No code execution | Pass |
| Source on GitHub | Pass |
How do I install build123d-mcp?
- Find the launch command. The README says how the server starts (npx, uvx, docker or a remote URL) and which API keys it needs.
https://github.com/pzfreo/build123d-mcp
- Add it to Claude Code. Replace the part after -- with the command from the README. Remote servers use --transport http with a URL.
claude mcp add build123d-mcp -- <command from README> claude mcp add --transport http build123d-mcp <server-url>
- Check it connected. This lists your MCP servers and their status.
claude mcp list
Or ask Claude to set it up
Paste this into Claude Code and it installs build123d-mcp for you:
Add the "build123d-mcp" MCP server from https://github.com/pzfreo/build123d-mcp to Claude Code. Read its README for the launch command and any API keys I need, run claude mcp add, then check that it connects.