Build123d

Verified Integration

Author: @exposing•Category: ServerApplication

GitHub Repository

JSON-RPC 2.0

Protocol Standard

Sub-second

Execution Latency

Active

Operational Status

Client Configuration

— Connect Build123d to Claude Desktop or Cursor in seconds

{
  "mcpServers": {
    "build123d": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-build123d"
      ],
      "env": {}
    }
  }
}

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows).

Architecture & Capabilities

System Overview

Enables AI assistants to build, inspect, and iterate on 3D geometry by exposing build123d CAD operations as tools.

Indexed Date

7/22/2026

License

Open Source

Protocol Layer

stdio / SSE RPC

Frequently Asked Questions

Architecture and operational details for Build123d

Build123d-mcp is an MCP (Model Context Protocol) server that exposes build123d CAD operations as tools, enabling AI assistants to interactively build, inspect, and iterate on 3D geometry.

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