CADPilot is an MCP server that lets AI clients (Claude Code, OpenCode, ZCode) pilot FreeCAD — building constrained sketches, parametric features, and persistent-joint assemblies from natural language.
AI pilots FreeCAD. CADPilot is an MCP (Model Context Protocol) server that gives AI clients (Cherry Studio, Claude Code, ZCode, Kimi Code, Claude Desktop, …) full control of FreeCAD: create documents, build constrained sketches, run parametric features, assemble parts with persistent joints, and verify geometry — all via tool calls over XML-RPC.
Models built by the AI through CADPilot — demo files live in examples/:
Modern Bicycle (uncolored) Sports Car (colored) :---: :---:
Parametric modeling, end to end — spreadsheet-driven variables, fully constrained sketches, PartDesign features (pad/pocket/revolution/…), dress-up ops, and a multi-view 2D→3D visual hull, all through one unified cad() tool. Step recording & rollback — every mutation runs in a FreeCAD transaction and is recorded as a session step; sessionrollback backtracks via native undo, so the AI can experiment and retry instead of rebuilding from scratch. Persistence — sessions, patterns, and settings survive restarts as JSON under ~/.cadpilot/; pause a session today, resume it tomorrow. Geometry sensing — measure volumes/areas, inspect face/edge topology, and check interference after every step; quantitative feedback replaces guesswork on complex models. Data-driven assembly — named anchors, residual-checked mates, connectivity audits, and persistent joints (FreeCAD 1.1 Assembly workbench) with declarative priority trimming. Workflow memory — successful modeling recipes are stored as reusable patterns and recalled on demand; the agent gets better the more you use it. Token-friendly — text-first responses with o
From the project README.
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Stop your AI from making things up — it proposes, deterministic tools decide, every claim checked against ground truth with evidence. Grounded facts and context survive resets. Reverse engineering is
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