Anthropic's internal ELI5 skill: explain like I'm five, with HTML visuals
Anthropic has been using an ELI5 Skill internally, triggered by /eli5 <topic>. It instructs the agent to explain a subject to a complete newcomer: avoid jargon, favor one big picture over dense text, and render complex ideas through an HTML artifact. The real payoff, as the post argues, is not simpler wording but forced knowledge restructuring — the agent must establish a mental model before diving into details and edge cases. Borrowed from Reddit's 'explain like I'm five' culture, this is a reusable output constraint for agent prompts, independent of any specific model, and easy to replicate in tools that support slash commands or custom skills. Useful for engineers tuning Claude or other agent output formats.