What a business bio is actually for
A business bio isn't your life story. It's a trust signal. It answers one question for the person reading it: should I work with this person or buy from this business? The most effective bios do this in three moves: who you help, how you help them, and why they should believe you. This prompt structures the output around all three without turning the bio into a resume or a self-congratulatory monologue.
The length option matters more than most people realize
A 50-word Instagram bio and a 150-word LinkedIn summary are completely different documents. They're read in different contexts, by people with different levels of intent, in different amounts of time. The prompt asks for your platform specifically because the AI will make different word choices, different levels of formality, and different structural decisions depending on where the bio will live. Don't skip that field.