What problem does it solve? Users sign up but never return, and teams lack a structured way to diagnose why engagement stalls. This Skill applies Nir Eyal's Hook Model (Trigger, Action, Variable Reward, Investment) to audit, score, and improve product engagement loops so usage becomes habitual rather than dependent on constant reminders. ## Core Features & Use Cases - Four-Phase Loop Audit: Evaluate triggers, actions, variable rewards, and investments with a 0-10 scoring rubric and concrete fixes to reach 10/10. - Habit Testing Framework: Apply the 5% habitual-user rule, identify the Habit Path, and diagnose which Hook phase is failing. - Ethics Evaluation: Use the Manipulation Matrix and dark-pattern checklists to ensure engagement mechanics serve users rather than exploit them. - Use Case: A PM notices users churn after onboarding. Run the onboarding audit checklist to find that investment is requested before the first reward, then reorder the flow and add a variable reward to the first session. ## Quick Start Audit my product's onboarding flow using the Hook Model and score each phase from 0 to 10 with specific improvements.
