Mastery still comes from doing the reps. Before agents, I got my reps as part of writing code: try different approaches out, debug what went wrong, review other’s code, read a lot. Agents can skip much of that work, so building your reps has to be deliberate. If I was new to the industry, I'd try to form a hypothesis before prompting. Ask "why" a lot, read the diffs, try to predict what might fail. Occasionally try to work through the problem myself manually. In my experience, good agent work depends on two abilities: 1. Deep expertise: you understand the problem domain well enough to define a good outcome. Understanding your user/product/business is part of this. 2. Applied judgment: use your taste to turn this into a clear, testable plan by choosing the right context, constraints, tests and verification. To build these the skills I'd practice are decision making, specifying, steering and verifying.