The Course grades what you shipped. The Loop grades how you got there. You're handed a failing build and a live failure log; you read the repros, steer the agent, verify, and close it out — graded on the loop, not the prose. As models get better, this is the skill that doesn't get automated away. It's the automating.
Coming from the spec holes? ← The Course
More arenas land here on their own terms — The Conductor (author an orchestration that survives a distribution of tasks), understanding-needs duels, real agent-architecture problems. The Loop is where the product is going.