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learn
Learn a new domain the way that actually sticks: map the whole terrain first (the big picture, as a navigable HTML map), then take guided first-principles deep-dives one small chunk at a time, with Feynman teach-back gates and spaced repetition so it stays in memory. Use whenever the user wants to get into a broad or unfamiliar field over time — "teach me X from scratch", "I want to learn this domain", "help me understand this field", "build me a learning map for X", "map out X for me", "where do I even start with X", "I keep forgetting X, help me retain it", "make me a study plan for X". Persists a per-topic map you can reopen and resume. Do NOT use it to explain a single artifact already in front of you in one sitting (a specific diff, PR, function, or paper) — that is the tutor skill. Reach for learn when the unit is a whole domain and the horizon is weeks, not one answer.