FlexBook

FlexBook is a booking platform connecting clients with personal trainers. Users can browse trainer profiles, view specializations and certifications, check real-time availability, and book training sessions. Trainers manage their schedules, set pricing, and track client progress. This project is part of the 777-1 Experiment, built with a "goldilocks zone" prompt that is intentionally underspecified to test how AI models handle ambiguity. After initial generation, 7 context engineer subagents (Amber, Kristy, Micaela, Lindsay, Eesha, Daniella, and Cassandra) will review the application in sequence, each focusing on their specialized domain. The findings will be documented in a case study that contributes to developing an algorithm for predicting prompt failures before they happen. As a complex project with implicit authentication (browse trainers freely, sign in to book), FlexBook tests state isolation challenges where trainer availability and client bookings must remain perfectly synchronized.