Retention Phase Intervention Selector

Use this skill to diagnose which retention phase (initial / medium / long-term) is broken for a user cohort and select the RIGHT type of intervention for that phase — because retention tactics that work for week-1 users fail completely for month-6 users. Reads cohort retention data, classifies the phase using product-type benchmarks (mobile ~1 day, SaaS ~1 month, e-commerce ~90 days), identifies where the curve breaks, and prescribes phase-appropriate hacks: aha-moment optimization for initial, habit formation + variable rewards for medium, feature velocity + ongoing onboarding for long-term. Includes a resurrection branch for dormant users and flags the churn-masking-by-acquisition anti-pattern. Triggers when a growth PM asks 'users churn after the first week', 'our month 2 retention drops off a cliff', 'retention is bad but I don't know why', 'cohort analysis help', 'how do I improve retention', 'retention curve diagnosis', 'initial vs long-term retention', 'Balfour three-phase retention', 'habit formation', 'variable rewards Hooked', 'zombie users resurrection', 'win-back campaign', 'feature bloat', or 'churn hidden by acquisition'. Also activates for 'my DAU looks good but retention is bad', 'we're growing but churning', or 'retention-first growth'.

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Install

Claude CodeClawhHubnpxCursorCodexGemini CLI

1. Add marketplace

› /plugin marketplace add bookforge-ai/bookforge-skills

2. Install plugin

› /plugin install hacking-growth@bookforge-skills

3. Use the skill

› /retention-phase-intervention-selector

CC-BY-SA · Open sourceGitHub

Source Book

Hacking Growth

Sean Ellis, Morgan Brown

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