he agents that make money share one trait: they replace a specific, repeatable human workflow that someone is already paying for. Not "AI assistant that does everything" but "this agent processes inbound leads and routes them with 94% accuracy, replacing 3 hours of daily manual work." The ROI calculation is trivial when framed that way. Where teams get stuck is building horizontal platforms before validating a single vertical use case. Pick one workflow, measure the before/after, ship it. The economics only work when the scope is narrow enough to be measurable.