Last weekend I built Pact, a Chrome extension that puts Claude in the side panel to think and Fo (an AI assistant) to act, so a good idea turns into a booked next step instead of a note you forget. Two days, an empty folder, and a live site at withpact.vercel.app at the end of it.
What worked was one rule: Pact proposes, you decide. Claude drafts the thinking, Fo handles the real-world part, and nothing happens until I approve it. That boundary kept the weekend from turning into a debugging session, because nothing the agents did ever happened without me seeing it first.
By Sunday night it had taken a recipe page and turned it into a proposed calendar block and a categorized shopping list, both checked. I expected the hard part to be the AI. It wasn't. The hard part was deciding what an agent is allowed to do on its own, and getting that decision right early is why it shipped.