build123d MCP Server

by pzfreo Your server? Claim it

local only

build123d MCP runs on your own machine — the client starts it, so there is no endpoint to ping. 1 288 installs a week from pypi. Last commit 15 Oct 2026.

AI-driven 3D CAD via build123d: execute, render, measure, and export geometry interactively.

Installs per day peak 752 · avg 316 · -32% w/w

a month agotoday

1 288

Installs / week

pypi · build123d-mcp

137

Stars

60 open issues

15 Oct 2026

Last commit

from GitHub

Apache-2.0

License

Python

What the code does

We read the source, 4 d ago · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Unsafe deserialization src/build123d_mcp/_vtk_render_subprocess_worker.py:22, [пакет] src/build123d_mcp/_vtk_render_subprocess_worker.py:22, src/build123d_mcp/tools/render.py:506 и ещё 1

        args = pickle.load(f)

Runs an external command src/build123d_mcp/tools/_bounded.py:115, src/build123d_mcp/tools/locate.py:264, src/build123d_mcp/tools/render.py:35 и ещё 7

            proc = subprocess.run(

Builds a file path from a variable src/build123d_mcp/tools/_bounded.py:97, [пакет] src/build123d_mcp/tools/_bounded.py:97, src/build123d_mcp/tools/render.py:464 и ещё 1

    steps = {label: os.path.join(work, f"{i}.step") for i, label in enumerate(shape_map)}

Executes code built at runtime src/build123d_mcp/tools/library.py:160, [пакет] src/build123d_mcp/tools/library.py:160, src/build123d_mcp/tools/resolve.py:234 и ещё 3

    exec(compile(source, entry["path"], "exec"), namespace)  # noqa: S102

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

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

~/Library/Application Support/Claude/claude_desktop_config.json

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

~/.codex/config.toml

[mcp_servers.build123d-mcp]
command = "uvx"
args = ["build123d-mcp"]

.cursor/mcp.json

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

.vscode/mcp.json

{
  "servers": {
    "build123d-mcp": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "build123d-mcp"
      ]
    }
  }
}

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build123d MCP — questions

Answers built from our own checks of this server.

Why is there no uptime for build123d MCP?

build123d MCP runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the pypi package build123d-mcp was installed 1 288 times last week.

How do I connect build123d MCP?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It runs locally, so the command pulls build123d-mcp straight from pypi; nothing to host, nothing to sign up for.

How many people use build123d MCP?

The pypi package build123d-mcp was installed 1 288 times in the last week. Week over week that is -32%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is build123d MCP open source?

Yes — it is published under the Apache-2.0 licence, written in Python, 137 stars on GitHub and 60 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.