Start with one job: a dog-walking owner needs bookings and a clear phone journey, not ten unfinished features. Write the complete first brief in Grafter, naming the customer, screens, saved details, rules and successful ending. Grafter opens the working preview beside the chat, where the app can be checked at a real phone width. Ask for one bounded revision: keep the booking flow and bring the prices closer to the top. Finish by completing the journey yourself, including an empty field and the final confirmation.