ClassCAD MCP
ClassCAD CAD MCP server: an agent builds parts and assemblies with scripts, views snapshots and saves STEP and STL
- 185 ★ on the repository
- Last commit
Extended access
Why this level
- The daemon listens on local ports and a session link opens it to another person
- The server downloads and runs an engine build from the network
Install
- Works in
In your terminal, with SkillFoxx CLI
npx skillfoxx add mcp/classcad-mcpDetects the agents on your machine, shows the access level and pins the version.
Other ways to install
Access and checks
How we reviewExtended accessThe tool runs code or makes network calls and only reads external data.
- The daemon listens on local ports and a session link opens it to another person
- The server downloads and runs an engine build from the network
This is third-party code. Review the repository files before installing.
What it does
The `@classcad/mcp` package connects Claude Code, Claude Desktop, VS Code Copilot and Cursor to a live session of the ClassCAD CAD engine. The agent builds parts and assemblies with parametric scripts, inspects the model tree, renders snapshots and saves and loads STEP, STL and OFB files. The engine runs inside the server as a WASM build, so no separate CAD server or key is needed: signing in once to a free classcad.ch account is enough. The session is shared. The Buerligons app docks into the same engine: you rotate, select and edit the same model the agent builds. A session link can be sent to a colleague or opened on another device through a relay. One daemon per machine serves all client tabs and each drawing gets its own engine. The repository also holds a skill with learning material, a script, a renderer and an in-app agent for buerli apps.
Who it is for. Engineers and designers who model parts parametrically and want an agent to build geometry while a human edits it in the same window.
Good fit when
- A flanged part with holes is needed and the agent builds it with a dimensioned script
- The agent builds geometry and you edit it in the Buerligons app in the same session
- The session model is saved to STEP or STL for handoff to manufacturing
- A colleague gets a link to the live session and sees the same edits on their device
- The result is checked with snapshots and numbers and not by the agent description
Not a fit when
- You need FreeCAD or AutoCAD work: the server is tied to the ClassCAD engine only
- You need strength calculation or a tolerance stack by standard: the tool builds geometry
- You have no classcad.ch account and do not want to sign in: the engine needs a key from the free account
Example request
Build a flanged bushing with four bolt holes, show a snapshot and save the model as STEPMCP
- Transport
- stdio
- Authentication
- OAuth
Limitations
Node.js 20 or newer and internet access are needed on first launch: the package comes from npm and the engine build of about 16 MB downloads once from `awvstatic.com`. Work requires signing in to a free classcad.ch account through Google, GitHub or email. On Windows clients cannot start `npx` directly, so the command is `cmd` with arguments `/c npx -y @classcad/mcp@latest`. The daemon listens on local ports 9097 and 9098. The repository root has no license file.
How to disable. Remove the server in the client (`claude mcp remove classcad`) and stop the daemon by closing the linked client tabs.
FAQ
How do I connect ClassCAD to Claude Code?
Run `claude mcp add classcad --scope user -- npx -y @classcad/mcp@latest`. On Windows use `cmd /c npx -y @classcad/mcp@latest`.
Do I need a separate CAD server?
No, the ClassCAD engine is built in as a WASM build and runs in a daemon thread. You only need a free classcad.ch account for the engine key.
Which formats are supported?
Saving and loading STEP, STL and OFB, plus snapshots for viewing the result.
How does the shared session work?
The Buerligons app docks into the same engine, so you edit the same model together with the agent. A link goes to a colleague through the relay.
How many processes start?
One daemon per machine. Each client tab starts a thin stdio shim that finds the daemon on `127.0.0.1:9097` or starts it.
Discussion
No questions or reviews yet.
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Comparison with similar tools
Cards that share the main search query, and how they differ.
| Tool | Official | Authentication | Repository stars | Main difference |
|---|---|---|---|---|
| ClassCAD MCP (this card) | yes | OAuth | 185 | |
| CAD-MCP Server | no | not required | 693 | drives an external CAD application; here the engine is built into the server and a human and an agent share the session |
| FreeCAD MCP | no | not required | 3,310 | drives an installed FreeCAD; here a separate ClassCAD engine with no install |
README in short
The root README presents the repository as five parts: a skill, a script, a renderer, an MCP server and an in-app agent. Installation and daemon details live in the `packages/mcp` README.