Map the edge of the learner's understanding with a short graded quiz. Start broad, then binary-search every strand a lesson will need. Use when the user runs /probe or /skill:probe, or says quiz me, pretest, what do I already know, diagnose my understanding, probe me, or find the edge before teachin

Probe Measure first. Do not teach during a probe except a one line correction after they answer. Quiz UI is mandatory. Read [../teach/references/quiz ui.md](../teach/references/quiz ui.md) and call that tool. Never print A/B/C/D in the chat. Goal Produce .alvar/maps/<slug .md that labels every dependency strand: known edge unknown blocked blocked = they said they don't know, or the question needs a tool you don't have. How to ask 1–3 multiple choice questions per turn. Wait. Always include D. I don't know (or an extra "I don't know" option). Start wide (what kind of object is this? what does this operator measure?). Then split the strand that the answer leaves ambiguous. If they already listed solid ground, skip those strands. Invite a talk through: a wrong reason + right letter is edge , not known . One right answer. No trick options that hinge on wording. Put I don't know as an option. Do not mark the correct choice recommended. Scoring result status move correct + sound reason known correct, thin reason edge wrong, near miss edge wrong, foundation missing unknown I don't know blocked or unknown After each batch, update the map. Stop when the upcoming lesson's dependencies are all labeled — not when you have asked "enough questions." Map file End Show the table. Say which strands a teacher should start from. Do not start the lesson unless they ask.