This one helps you apply behavioral science and cognitive bias research to marketing copy and design decisions. You'd reach for it when you're working on hooks, pricing pages, or any persuasion-oriented writing where framing matters. It's part of Corey Haines' marketing skills collection, designed to slot into Claude's planning flow so the agent can tighten copy using psychological principles without you having to remember which biases apply where. The upstream repo has the full workflow and references. Honestly most useful if you're already thinking about conversion optimization and want a second pair of eyes that knows the research.
npx skills add https://github.com/nexu-io/open-design --skill marketing-psychology