6.1The Core Principle

AI generates tests fast. You must review them carefully. The 10x Review pattern means spending 10% of the time generating and 90% reviewing. This is not a flaw of AI -- it is the correct allocation of human expertise.

Think of it this way: a prolific junior engineer can write 50 tests in an afternoon. A senior engineer's value is not in writing those 50 tests -- it is in identifying which 5 are tautologies, which 10 have brittle assertions, and which 3 are testing the mock instead of the code. AI is that prolific junior engineer. You are the senior reviewer.