build123d MCP

build123d-mcp is not a standalone chatbot or CAD program. It is a CAD toolbox that an AI/LLM app can use through MCP. It runs locally over stdio via the published package.

People who work with build123d, cad and python3 and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-09-04 · ★ 88 · #48 OF 945 MAINTAINED OTHER · VERIFIED 2026-09-18

Apache-2.0 · Python servers · how we verify → /methodology

01 · Install build123d MCP

Claude Code

claude mcp add pzfreo-build123d-mcp -- uvx build123d-mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "pzfreo-build123d-mcp": {
      "command": "uvx",
      "args": [
        "build123d-mcp"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license Apache-2.0 - declared in the repository

pypi package build123d-mcp - check the name against the project README before installing (PyPI has no namespace ownership)

registry namespace io.github.pzfreo is GitHub-verified and matches the repo owner

03 · What build123d MCP can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

v0.3.84 · 2026-09-04

Patch release focused on reliable source-backed CAD generation and editing evidence. · Highlights: · Add shared recognise_features evidence for edit workflows, including run-local recognition handles and stale-handle…

v0.3.83 · 2026-08-28

Subtract internal voids from cross_sections areas (#454) · Distinguish interpenetrating solids from disjoint ones in validate() (#453) · resolve() reports an entity's centre, not a point on it (#456) · Anchor…

v0.3.82 · 2026-08-09

Migrate to MCP Python SDK v2 and gate on the official conformance suite · Isolate HTTP clients into per-handle CAD sessions · Add native 3MF export format · Stream the 3MF mesh into the zip instead of building an…

04 · Who maintains build123d MCP

build123d MCP is maintained by pzfreo. It's the only MCP server we track from this author; the repo dates to Apr 2026.

05 · Facts

repository: github.com/pzfreo/build123d-mcp
category: other - ranked #48 of 945 actively-maintained other servers as of 2026-09-18.
release cadence: 10+ releases in the last 90 days (latest 2026-09-04)
registry: io.github.pzfreo/build123d-mcp (active, first published 2026-05-05 · 69 versions)
packages: pypi:build123d-mcp

06 · build123d MCP FAQ

What is build123d MCP?

build123d-mcp is not a standalone chatbot or CAD program. It is a CAD toolbox that an AI/LLM app can use through MCP. It runs locally over stdio via the published package.

Is build123d MCP still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-04 and it shipped 10+ releases in the last 90 days. We re-verify nightly.

How do I install build123d MCP?

Run `uvx build123d-mcp`. You can also paste the ready-made client config above.

Does build123d MCP run locally?

Yes - it's a stdio server: it runs on your machine (via uvx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to build123d MCP

Alternatives to build123d MCP

Maintained other servers if build123d MCP isn't the fit.

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