Custom Agents are AI teammates that automate your busywork. Here are five tips to build your first one: 1) Pick one task you do repeatedly (tagging, routing, weekly recaps) 2) Write clear instructions: the goal, the format, and what to do when it's unsure 3) Add a trigger (on a schedule or when X happens) so it runs in the background 4) Start with the minimum permissions it needs. You can expand later. 5) Test run → tweak → test again.