SolidWorks MCP server

SolidWorks MCP

Let an AI agent (Claude, or any other MCP client) model real parametric parts and assemblies in your own SolidWorks — and check its own work. Every modelling call returns the measured volume, mass and bounding box, so the agent can compare the result with the spec and correct itself instead of guessing that it "looks about right".

<!-- mcp-name: io.github.hjbaard/solidworks-mcp -->

Built by the tools themselves: a mounting bracket (every step checked against a hand calculation), a revolved + shelled vase, a swept pipe, a lofted + shelled horn.

Why this server

dimensions and mates are measured back after the rebuild.

• It verifies, not just generates. Features report measured geometry;

holes, counterbores, slots and pockets on any face; fillets, chamfers, shells, patterns, ribs, equations and materials. Assemblies with mates and interference checks. STEP/STL/3MF export and screenshots. 46 tools in total.

• Real CAD, not just primitives. Extrude, revolve, sweep, loft and splines;

{ok: false, error} with the cause, never silently wrong geometry.

• It fails loud. A call that cannot do what was asked returns

agent can only do what the tools allow.

• A fixed, typed tool surface. There is no "run arbitrary code" tool; the

compares the result with a hand calculation.

• Tested against real SolidWorks. 187 tests; each feature's integration test

makes no network calls.

• Local. It talks to your running SolidWorks over COM; the server itself

Quickstart

instance — it does not launch one).

1. Install uv.
2. Start SolidWorks and leave it open (the server attaches to the running

1. Register the server with your MCP client.

Claude Code:

claude mcp add solidworks -- uvx solidworks-mcp

Claude Desktop (claudedesktopconfig.json) or any other client:

{
     "mcpServers": {
       "solidworks": {
         "command": "uvx",
         "args": ["solidworks-mcp"]
       }
     }
   }

It is also listed in the official MCP Registry as io.github.hjbaard/solidworks-mcp.

1. Ask for a part, for example:

Design a 100 × 80 × 8 mm mounting plate with a Ø16 mm centre bore, four

counterbored M5 holes 12 mm from the corners and R5 corners. Check the

volume against your own calculation, then export a fine STL.

Requirements and compatibility

exist since SOLIDWORKS 2020 SP2, so 2020–2025 should work, but that is untested. Tried another version? Please open an issue with the result, whether it worked or not.

• Windows, with SolidWorks installed, licensed and running.
• Python 3.11+ (uv fetches one if needed).
• Tested on SOLIDWORKS 2026 (3DEXPERIENCE R2026x). The API calls it uses

Shortened. The full README is on GitHub.