Autodesk Fusion

Kind: App MCP · Document: model.f3d · Install: brew install --cask autodesk-fusion · Override: CXDDIE_FUSION, CXDDIE_FUSION_MCP_URL

Cxddie connects to Fusion's own MCP server and serves the usual CAD session on the workspace's port, so agents get the same tools as everywhere else.

One-time setupCopy Anchor Link

Turn on Fusion's MCP server under Preferences → General → API, or install the Fusion MCP add-in. Fusion has to stay open while agents work. If Fusion isn't running, Start launches it and waits for the server.

Cxddie tries Autodesk's built-in server at http://127.0.0.1:27182/mcp, then the add-in's http://127.0.0.1:9100/. If your Fusion shows a different port, set CXDDIE_FUSION_MCP_URL.

One design per workspaceCopy Anchor Link

Every workspace gets its own design in the running Fusion. Cxddie tags it with the workspace's id and makes it active before every call. Workspaces using Fusion take turns, so several agents and a fan-out can share one Fusion safely.

save writes the design to the worktree as a Fusion archive (model.f3d), so Keep this commits and merges it like any other CAD file. An existing .f3d in the repo is opened when the workspace starts.

What agents getCopy Anchor Link

run_code runs a Fusion API Python script in the workspace's design, as one undo step. These are in scope:

• adsk (core, fusion), app, ui
• design — the workspace's adsk.fusion.Design
• root — its root component

Plain statements are fine. A script that defines run(context) itself also works.

Fusion's other tools, such as its API documentation search, are offered too, as fusion_<tool>.

Conventions agents are toldCopy Anchor Link

• Fusion's API works in centimetres. Divide millimetres by 10.
• Prefer parametric features (sketches, extrudes, fillets) on root, and name them.

sketch = root.sketches.add(root.xYConstructionPlane)
sketch.sketchCurves.sketchLines.addTwoPointRectangle(
    adsk.core.Point3D.create(0, 0, 0), adsk.core.Point3D.create(6, 3, 0))
root.features.extrudeFeatures.addSimple(
    sketch.profiles.item(0), adsk.core.ValueInput.createByString("6 mm"),
    adsk.fusion.FeatureOperations.NewBodyFeatureOperation)