The Pain : You spent an afternoon tuning your agent. Next morning, it stares at you blankly — as if yesterday never happened. What You'll Learn : The 4-stage evolution (Prompt → Context → Harness → Loop), and a runnable 50-line Loop Agent that persists memory. 0. Prerequisites Python ≥ 3.10 pip install openai (openai ≥ 1.0.0) OpenAI API Key OS: macOS / Linux / Windows WSL Goal : Copy-paste the code, run it, and see a Loop Agent that doesn't forget. ...