Build parametric parts
Create sketches and common features, then drive dimensions through first-class Variable Studios.
Cloud CAD MCP · Open source
Build, inspect, and refine Onshape with AI.
A performance-focused MCP toolkit for creating, inspecting, rendering, and refining parametric Onshape models with AI.
Onshape cloudAgentic MCP clientsPython + uv
Open-source projectAOTEAROA LABS
Ultron Onshape MCP
≈60CAD and inspection tools
CloudOnshape API workflow
MITopen-source licence
Overview
Built to be useful from the first minute.
Ultron connects MCP-capable agentic coding tools—including Codex and Claude Code—to real Onshape documents through the Onshape API. It supports parametric parts, assemblies, Variable Studios, FeatureScript, rendering, inspection, reference-image comparison, and common CAD exports.
Structured mutation results report what changed, expose regeneration warnings, and suggest the next move, helping the AI verify each modelling step instead of assuming it succeeded.
Ultron is an independent open-source project. It is not affiliated with or endorsed by Onshape or PTC.
What it does
Clear features, without the clutter.
See and compare
Render multiple views, inspect entities, and compare work in progress with a reference image.
Get truthful results
Structured mutation responses surface changes, warnings, regeneration failures, and useful recovery hints.
Go beyond primitives
Work with assemblies, FeatureScript, geometric diffs, measurements, and common export formats.
Availability
Use the official link.
Live buttons open the official store listing or project repository. Planned platforms are shown now so there is a clear place for future releases.
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