agentcad

agentcad is a specialized tool that acts as a bridge between AI coding assistants and the world of computer-aided design (CAD). It's an open-source MCP server and command-line interface that allows an AI agent, like Claude Code or Cursor, to write Python scripts that generate real 3D geometry. Instead of you manually operating CAD software, you give a prompt to your AI agent, and it uses agentcad to execute the code, check the results, and produce usable CAD files. The tool handles the entire pipeline from script execution to final export.

What makes agentcad stand out is its focus on creating a tight feedback loop for the AI. When the agent runs a script, agentcad doesn't just execute it; it automatically generates a versioned STEP file, calculates geometric metrics (like volume and face count), and renders PNG previews from multiple angles. The AI can see these renders and metrics, allowing it to inspect its own work and catch geometry mistakes before presenting the final design to you. It supports exports to common formats like STL and GLB for 3D printing and integrates seamlessly via the Model Context Protocol (MCP) with popular AI coding environments.

This tool is a powerful asset for engineers, product designers, and hobbyists who prototype with 3D models. If you frequently design simple enclosures, brackets, or custom parts, you can describe your need in plain English to your AI assistant and get a printable 3D model in minutes. It's also useful for educators and students exploring generative design, as it turns conceptual prompts into tangible, valid geometry without requiring deep CAD software expertise.