Agent Skills: promote-post

Write a promotional tweet for a published article. Takes a post URL (Substack, X Article, blog) and crafts a teaser tweet that opens the story and draws readers in — not a summary, but a hook that leads naturally into clicking the link. Use when user says "promote this post", "write a tweet for this article", "推广这篇文章", or provides a link and asks to write a promo tweet.