IntroductionRecently, I discovered an invaluable resource called Learn Claude Code. Despite its name suggesting a guide to using Claude Code, it actually teaches you how to build a nano Claude Code-like agent from the ground up, adding one mechanism at a time through twelve progressive stages.Let me share the link again: https://learn.shareai.run/zh/The website opens with a refreshingly direct statement: All AI programming agents share the same fundamental loop—call the model, execute tools, return results. Production-grade systems layer str...