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 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

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

# Map — <goal>

Updated: <ISO date>
Goal: <one sentence>

## Strands
| strand | status | evidence |
|--------|--------|----------|
| … | known | Q2 + reason |

## Quiz log
- Q1 [strand] <letter> — correct|wrong|idk — <five words>

End

Show the table. Say which strands a teacher should start from. Do not start the lesson unless they ask.