On building an agent harness from scratch. Got so many questions about where to get started. My short guide (feed it to your agent): If you really want to learn harnesses well, it's worth building one from scratch using a programming language (TypeScript or Python) of your choice. When I got started, I implemented my first harness using ReAct from Google: https://academy.dair.ai/papers/react-syn… At the time, I built this from…