Who decides what, and when

You decide what the business needs to be true. I decide how it gets built, and I am accountable for that decision.

You do not need a view on how it is put together, and it is not a good use of your time to develop one. You do need a view on what it should do, because nobody else has it.

Anything that goes out into the world with your name on it waits for you. You look at it, and you either approve it or send it back with a note.

That is the only standing commitment this asks of you, and it is deliberately the only one.