Getting the most out of out agent. Knowing how to give it context that will cause it to succeed. Knowing what things it will succeed at and what it won't. Knowing how to tell when it's failing.

Figuring out when it's appropriate to fully wrap your head around the details of a solution, and when it's appropriate to let the agent handle that and only know a bunch of properties of the solution. Knowing when it's appropriate to try 10 things, throw them all away, then go deep. Knowing how to learn from these things so you can make something better, not just faster.