onshape-mcp (gpambrozio)
Onshape MCP server with 93 tools for sketching, solid features, assemblies, drawings, and export, driven from any MCP client.
Summary rewritten from the vendor site because the catalog version did not match it.
What it does and how it connects
Onshape MCP Server drives Onshape CAD from an AI assistant, with 93 tools for documents, part studios, sketching, solid features, assemblies, drawings, measurement, and export. The example in the README has the assistant sketch a 60 by 40 by 10 mm bracket with 4 mm mounting holes and 2 mm fillets, measure the result, render it back into the conversation, and export an STL.
There is nothing to configure beyond installing it: the first tool call that needs Onshape opens a browser and asks the user to connect, and keys are verified against Onshape and stored in the OS keychain. Credentials never pass through the assistant, the model, or the project's authors, per the README. OAuth 2.0, pasted API keys, environment variables, and an existing onshape-cli credential are supported as alternatives.
It installs with npx for Claude Code, Cursor, VS Code, Windsurf, and Zed, or as a double-click .mcpb bundle for Claude Desktop. Node 20 or newer is required.
Alternatives
Compare side by side- onshape-mcp (altendky)
A self-hosted MCP server that gives AI assistants read and write access to Onshape documents through user-owned API credentials.
- Jarvis Onshape MCP
A Claude Code plugin for driving real Onshape CAD with vision-based decomposition and parametric iteration.
- cloudCAD-copilot
A demo AI assistant for Onshape that detects fastener holes from real assembly geometry and batch-inserts standard parts.
- fusion360-mcp-server
An MCP server that connects AI coding agents to Fusion 360 through an in-Fusion add-in bridge.
- solidworks-mcp (hjbaard)
An MCP server that lets AI agents build, measure, and verify parametric parts and assemblies in a live SolidWorks session over COM.
Recurring errors it addresses
Error Index entries this tool is built to reduce or work around.
- Drawing toolset is described as missing basic drafting capabilities and mark-up controls.Error Index
- Large-assembly handling and richer 3D communication workflows are described as limited compared with expectations.Error Index
- Onshape-exported URDF had a camera frame flipped 180 degrees and forearm roll axes 11.0 and 10.7 degrees off; editing the URDF is pointless because the export overwrites it, so a load-time correction table patches the model in memory.Error Index
- Onshape's URDF export puts a roll of -pi on the lidar joint, mirroring every scan, while the link's visual origin carries a compensating +pi so the model looks right in RViz and only the laser scan is wrong.Error Index
- A fillet fails with "both faces next to the edge must be planar" on a part the user built easily in Onshape.Error Index
Sources
Not verified
- Pricing: none stated on the repo.
- Real user voices (the only recent issue is a request about the security reporting channel, not a report on using the tool).
- A named individual builder beyond the repository owner handle gpambrozio
Last verified November 6, 2026. Listings are informational. The evidence score measures public, verifiable evidence and is not an endorsement or a compatibility claim.