OwlCAD’s interesting claim is not simply turning a text prompt into a pretty mesh. Its browser CAD tool creates dimensioned solids and editable operations: sketches, extrusions, fillets, booleans, patterns and threads. It advertises STEP, STL, 3MF, OBJ, GLB and DXF exports. Those are the kinds of outputs that can actually enter a fabrication workflow.
More intriguing for your Plasticity work is its hosted MCP server. The developer says an MCP-capable assistant can author a node tree, run it through the CAD kernel, inspect the render and return a project that remains editable. Manual modeling is advertised as free without an account; MCP integration is a Pro feature.
An editable model means you can change a dimension instead of asking AI to regenerate a new triangle soup. A witness stick, bracket or small enclosure with exact millimeter dimensions is a better test than an elaborate sculpture.
Treat the agent and STEP claims as vendor claims, not proven production capabilities. You should confirm that changing a dimension preserves topology and that the STEP export behaves sensibly in Plasticity. There is no need to switch to Windows or abandon existing tools.
What to do: Start in the free browser editor: make a 30×20×5 mm plate with two holes, alter one dimension, then test STEP/STL export before considering MCP Pro.