email-subject-line-optimizer

Quick Review

The skill addresses a useful marketing task (email subject line optimization) with clear novelty potential, but severely lacks implementation details. The SKILL.md is essentially a template with placeholder text rather than actual copywriting frameworks, A/B testing methods, or open rate prediction logic. It provides no concrete examples of subject line variations, no copywriting frameworks (e.g., AIDA, PAS, curiosity gaps), no historical performance data or prediction models, and no specific A/B testing criteria. The description promises 'proven copywriting frameworks' and 'predict open rates based on historical performance' but delivers only generic instructions. A CLI agent would struggle to invoke this meaningfully without substantial additional prompting. Structure is reasonable but content is insufficient for practical use.