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The inbox first. The model comes later.
Choosing the model first is like choosing the truck brand before knowing what you're hauling. The task says what has to be read, what must never be made up and which mistake is serious. A model that writes well but invents an order number is useless for that task, however slick the demo.
The scope names the inbox, the document type or the exception. “We want to use AI” isn't a scope. “Incident emails arrive classified with a draft reply, and nobody publishes without reviewing it” is. If it can't be explained with a real example from last week, we don't automate yet.
The example is the contract: this email yes, this email no, this field gets filled, this field is left empty on purpose. Without that sentence, the workflow fills gaps with inventions and the team stops trusting it by the third time.