email-subject-line-optimizer

Quick Review

The skill addresses a valuable marketing use case (subject line optimization with A/B testing and open rate prediction) but lacks concrete implementation details. The SKILL.md provides only generic templating guidance without specific copywriting frameworks, predictive models, or A/B testing methodologies mentioned in the description. No actual frameworks (AIDA, curiosity gap, urgency triggers, etc.) are documented, no open rate prediction logic is provided, and no historical data handling is specified. While the structure is clean and the concept is novel enough to warrant a skill, it reads more like a boilerplate template than a functional skill with domain expertise. To score higher, it needs: specific copywriting frameworks with examples, clear A/B testing criteria, open rate prediction methodology (even rule-based heuristics), and concrete subject line generation patterns.