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build123d MCP

build123d MCP is an MCP server that adds tools to AI assistants such as Claude Desktop, Claude Code and Cursor. AI-driven 3D CAD via build123d: execute, render, measure, and export geometry interactively. It has 106 GitHub stars, is released under the Apache-2.0 license and runs locally with uvx build123d-mcp.

github.com/pzfreo/build123d-mcp (opens in a new tab)

  • Other
  • Apache-2.0
  • Actively maintained
View on GitHub (opens in a new tab)

Install build123d MCP

Generated from the server's MCP registry entry. Replace your-value with your own values.

Claude Desktop

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

Settings > Developer > Edit Config. macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\. Restart Claude Desktop afterwards.

Claude Code

claude mcp add --transport stdio build123d-mcp -- uvx build123d-mcp

Cursor

.cursor/mcp.json
{
  "mcpServers": {
    "build123d-mcp": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "build123d-mcp"
      ]
    }
  }
}

Project file; use ~/.cursor/mcp.json to enable it in every project.

VS Code

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

Config formats checked against the official docs on Oct 7, 2026: modelcontextprotocol.io (opens in a new tab), code.claude.com (opens in a new tab), cursor.com (opens in a new tab), code.visualstudio.com (opens in a new tab).

About 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. With an LLM app such as Claude, Cursor, VS Code, Continue, Cline, or Codex CLI, build123d-mcp lets the assistant create build123d CAD models, render previews, measure geometry, fix mistakes, and export files such as STEP, STL, SVG, and DXF. Instead of writing a whole CAD script blindly, the assistant can build a part in small steps and check the result as it goes.

  • ai-tools
  • build123d
  • cad
  • mcp
  • mcp-server
  • python3

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FAQ

build123d MCP FAQ

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What is build123d MCP?

build123d MCP is an MCP server that adds tools to AI assistants such as Claude Desktop, Claude Code and Cursor. AI-driven 3D CAD via build123d: execute, render, measure, and export geometry interactively. It has 106 GitHub stars, is released under the Apache-2.0 license and runs locally with uvx build123d-mcp. The source code is at github.com/pzfreo/build123d-mcp.

How do I install the build123d MCP MCP server?

Add the command uvx build123d-mcp to your MCP client: put it in claude_desktop_config.json for Claude Desktop, run claude mcp add for Claude Code, or add it to .cursor/mcp.json (Cursor) or .vscode/mcp.json (VS Code). The snippets on this page are ready to paste.

Is build123d MCP free?

The server is open source under the Apache-2.0 license, so running it is free. It does not declare any required API key.

Is build123d MCP actively maintained?

The most recent commit was on Sep 25, 2026. The latest release is v0.3.90, published Sep 25, 2026. appsgit only lists MCP servers with a commit in the last six months and re-checks every server daily.