In one sentence
A prompt set is the fixed list of questions a brand tracks across answer engines, chosen to represent how real buyers ask about its category. Holding the set stable is what makes AI visibility measurements comparable over time.
A usable prompt set spans the buying journey: awareness questions that do not name any brand, consideration questions that compare options, evaluation questions about price, integration or compliance, and decision questions that name you directly.
Most teams start with 40 to 60 prompts per brand and grow from there. Fewer than about 30 and weekly noise swamps the signal; changing the set mid-quarter breaks every trend line you were building.
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