Act on this, mostly signal

Unofficial Onshape MCP server drives a signed-in Chromium browser

What to do

Try the unofficial Onshape MCP server if you want agent CAD access without API keys, on macOS only.

Why

It is reverse engineered and tested only on macOS, and native commands may break with Onshape releases.

What the research found

Unofficial reverse-engineered Onshape MCP server that drives a signed-in Chromium browser via extension, needing no API keys; full browser setup tested only on macOS and native commands may break with Onshape releases.

Claims and how well the evidence supports them

No Onshape API keys are required; it uses the browser-signed-in session via a browser extension 99%
Full browser setup has been tested on macOS only 99%
Complete Onshape API/UI parity is not guaranteed and it is unofficial 99%
Requires uv, Python 3.12, and a Chromium browser on the same computer as the AI client 91%

Evidence

github.com https://github.com/godbrigero/onshape-native

Actionability rated low.