2026-06-24
Becoming an AI-Era PM 05 | Leave It Vague and AI Will Fill the Gaps for You
This is the fifth piece in the series Becoming an AI-Era PM. You tell AI "build me a login," and in one breath it settles a dozen things you never mentioned: email or phone, how many wrong passwords before it locks, how long the lock lasts, what the error message says. AI doesn't ask you back the way a person would — it's a yes-machine: it does what you said, not what you meant. The moment a requirement goes fuzzy, it fills the gap with the most generic default, and that default is usually not the one you wanted. OpenAI's Sean Grove says code is only 10–20% of a developer's value; the other 80–90% is saying clearly what to build. This piece gives you four things you can actually do: swap adjectives for numbers, write out every state, list the edge cases, and self-check with a zero-context test.