cad-agent

AI-driven CAD modeling agent with a visual feedback loop built on build123d and MCP for 3D-printable parts.

AgentSource-availableStaleMCAD

What it does and how it connects

CAD Agent gives an AI agent eyes for CAD. The agent sends modeling commands to a self-contained container, which does the work with build123d and returns renders the agent can interpret, so the agent creates, sees, evaluates, and iterates without a human relaying screenshots.

All CAD logic runs inside the container: the external agent only sends commands over HTTP or MCP, receives JSON and PNG results, and decides what to do next. The container renders with VTK, produces 2D technical drawings, exports STL, STEP, and 3MF, and runs printability analysis.

It runs as a Docker container serving on port 8123, with a workspace volume mounted in. The README states the agent should never do STL manipulation, rendering, or modeling outside the container, since that defeats the purpose and leads to fragile results.

What engineers report

The container always return error: Security Error: Forbidden keyword 'import' detected.
2026-03-08Read the original

Alternatives

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CADAM
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CQAsk
An open source LLM-powered CAD generation tool that produces 3D models from natural language using CadQuery.
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cadquery-mcp-server
An MCP server that exposes CadQuery-based CAD generation and automated model validation tools to AI assistants.
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freecad-ai
A FreeCAD workbench with a chat interface that builds and edits 3D models from natural language through 50 structured tools and 24 LLM providers.
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Recurring errors it addresses

Error Index entries this tool is built to reduce or work around.

A build123d assembly exported STEP with every product named ASSEMBLY or SOLID, so the downstream drawing editor could not list parts. Each CNC part, spacer and stock screw now gets a label; a full prototype build with real threads still segfaults in a boolean inside the thread code.Error Index

Sources

Not verified

No GitHub releases exist, so latest release fields are null.
Pricing: none stated on the repo.
Activity: last push 2026-02-17, so the project looks quiet; no releases exist.
A named individual builder beyond the Svetlana-DAO-LLC organization

Last verified November 6, 2026. Listings are informational. The evidence score measures public, verifiable evidence and is not an endorsement or a compatibility claim.