PlasticityMCP is an MCP server that lets an LLM read, create and modify real B-Rep geometry inside a running Plasticity window. No mouse: every box, extrude, fillet, boolean and export is a tool call, and every step lands in Plasticity's own undo history.

Everything in this video was modelled by a language model through the server — from drawings and photos: a Nintendo Entertainment System with two controllers and a cartridge, a Technics SL-1200 MK2, a Nikon F2 with an EL-Nikkor 50, and a full-suspension mountain bike. The line drawings are Plasticity's own export_drawing SVGs; the steel shots are Cycles renders of the exported meshes.

What it does • 144 tools covering the Indie command set: curves, profiles, extrude / revolve / sweep / loft, booleans, fillets & chamfers, face and edge ops, arrays, mirrors, instances, groups, materials, measurements, STEP / Parasolid / mesh / SVG export and import • Native channel over CDP — real Plasticity commands, undoable, no pointer • Compact catalog (--catalog=compact): 26 tools / ~5k tokens for small-context and local models • Modelling rules served by the server itself (modelling_guide)

Source, docs and the example models: https://github.com/ozymandi/PlasticityMCP