With a /prompt selected, we should show a placeholder-styled text after the slash command with the prompt description.

Works for the Claude Code input and prompts would really benefit from a "how to", example or specific argument hints.

Now: Show the prompt description or fallback "add more optional details for this prompt".

Later: @aeschli I'd propose to extend the current frontmatter with placeholder to have more concrete way to guide users. description is overloaded for agentic flows and will usually not be a nice/short how-to for users.