I wanted to build Jarvis from day one.

One agent that ran my whole life. Handled the business, wrote the blog, managed the calendar. The whole thing. From week one.

That was the real mistake. Cost me about three months.

I finally wrote down everything I got wrong while building Wiz since October.

Nine mistakes, a step-by-step walk-through of a real first build, and the one mental model that makes the whole thing click for beginners (the architecture of your AI agent is literally its folder structure, nothing hidden behind it).

If you're thinking about building your first agent, or you're already stuck, this is the post I wish someone had handed me six months ago.