Almost all the weight of a YouTube description sits in the first 150 characters, the part that shows before the more button. Everything after it is links, chapters and a tag set whose importance most people wildly overestimate. This prompt turns Claude, ChatGPT or Gemini into a description writer that gets the visible opening right, builds chapters that actually activate, and writes an honest tag list instead of padding to the limit.
Paste the prompt into a chat, a Claude Project, a custom GPT or a Gemini Gem, then give it your topic, your outline or transcript with real timings, and your links. It returns the visible opening printed alone with its character count, the full body, a validated timestamp block, a links block with the affiliate disclosure written in plain words, ten to fifteen tags, and a reusable footer for the rest of the series.
One file, one payment, yours forever. Pay once, keep forever, no login, no monthly fee. Use it on every video and every series you publish.