@XAMTO_AI: Want to write a coding agent yourself? You've read plenty of articles about the principles, but you get stuck at the first line when you actually start. Recently I found the Chinese tutorial *Hands-On Pi*, which starts with a real offline agent log and takes you through all 15 levels from the beginning. Truly build a complete coding agent from scratch—every step has runnable code...

Want to write a coding agent yourself? You've read plenty of articles about the principles, but you get stuck at the first line the moment you actually start. I recently found the Chinese tutorial *Hands-On Pi*, which starts with a real offline agent log and walks you through all 15 levels from the beginning. Build a complete coding agent from scratch—every step has runnable code, so you can clone it and verify it right away. Message and model protocols → tools and the agent loop → conversation tree storage → context compression → assemble a runtime and run evaluation. Each chapter comes with four things: the main text, a corresponding commit, focused tests, and failure experiments. The exercise directory is generated with a one-line command and comes without answers—just hand the instructions to an AI and let it be your sparring partner. Link: https://github.com/hahhforest/pi-textbook…