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cad-mcp-server

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from mattmohandiss

MCP server for AI-assisted STEP CAD inspection, geometry queries, PMI hints, and revision comparison

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CAD MCP Server

Give your AI assistant the ability to inspect, measure, and compare 3D CAD models. Drop in a STEP file, ask engineering questions, get measured answers. Runs entirely on your machine — no cloud, no CAD license, no setup.

Why Engineers Use It

  • Zero setup. One command. No CAD software, licenses, Docker, or cloud API.

  • Runs locally. Your STEP files never leave your machine.

  • Deterministic answers. Backed by the Open CASCADE kernel, not LLM guessing.

  • Read-only. Inspects geometry without modifying anything.

What It Can Do

Tool Example question inspect_step "What are the overall dimensions and volume?" query_faces "Find all cylindrical faces. Which ones are holes vs bosses?" query_edges "What's the smallest fillet radius on this part?" measure_step "Check wall thickness around every hole. Flag anything below 2mm." diff_step "What changed between revision A and revision B?"

The AI assistant interprets the measurements. You get engineering answers, not raw numbers.

Example Prompts

  • "Review this part for injection molding: check draft angles with +Z pull, measure minimum wall thickness, identify undercuts."

  • "Prepare a first-pass CNC plan: likely setups, drilling directions, features that drive cost."

  • "Compare these two revisions and flag what needs rechecking before tooling."

  • "Which holes are blind vs through? What's the depth of the blind hole?"

  • "Find the thinnest wall section on this part. Is it above the 1.5mm minimum?"

See docs/EXAMPLE_PROMPTS.md for more.

License

MIT. The bundled OCCT kernel uses LGPL-2.1. See THIRD_PARTY_NOTICES.md.