plasticity-mcp
Local MCP server for native Plasticity CAD automation on macOS, with an optional model review and print preparation workbench.
What it does and how it connects
plasticity-mcp is a local MCP server that controls Plasticity from an MCP client: inspect and measure native CAD geometry, create and edit models, and export the result. It runs locally on macOS Apple Silicon with Plasticity 26.1.3, with experimental adapter support for a separately prepared 26.2.1 copy, and it connects to a Plasticity window the user selects. It cannot run as a standalone cloud CAD service.
The server uses Plasticity's own command factories and document history through a loopback-only Electron CDP endpoint, without patching or re-signing the application. Inspection covers scene state, precise B-rep measurements, and references to bodies, faces and edges; modelling is native creation and editing with document history, Undo and Redo; delivery covers document operations, import and export, and camera screenshots. Geometry inputs use millimeters and degrees.
An optional Workbench supports model review, dimensional feedback and print preparation, including tablet annotations on the same local network and an optional Creality Print workflow for slicing and print-job preparation. The agent waits for explicit user confirmation before starting a print.
What engineers report
Plasticity already supports proportional slide-curve CV, but the MCP tool does not expose its proportional controls, so agents can slide selected curve handles but cannot request native falloff across neighboring handles.
2026-11-05Read the original
Alternatives
Compare side by side- freecad-mcp (blwfish)
An MCP server exposing FreeCAD modeling, CAM and diagnostics to agents, rather than a local server for native Plasticity on macOS.
- RhinoAI (Rhino MCP Platform)
McNeel's first-party Rhino plugin and MCP server for Rhino and Grasshopper, rather than a Plasticity server.
- SolidCraft (tangency-labs)
An open-source parametric 3D CAD application in Rust with a built-in MCP server, rather than a bridge to the commercial Plasticity app.
- text-to-cad
A text-to-CAD plugin and skills set that generates CAD geometry from prompts, rather than a server driving an existing Plasticity session.
Recurring errors it addresses
Error Index entries this tool is built to reduce or work around.
Sources
Not verified
- Pricing: none stated on the repo.
Last verified November 6, 2026. Listings are informational. The evidence score measures public, verifiable evidence and is not an endorsement or a compatibility claim.