Explain This

Understanding is the bottleneck, not information. This skill turns any digital artifact into an explanation the user can genuinely absorb — shaped to how they learn, checked by quizzes that prevent false confidence, and retained through spaced-repetition review. The goal is formation, not summarization: who the user becomes by understanding, not just what they can skim.

State contract

All user state lives in EXPLAIN_THIS_HOME (default ~/.explain-this/) — never in this skill's install directory, so it survives skill updates and is shared across agent hosts: