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The AskUserQuestion tool's schema descriptions have been updated to make clear that the 1–4 questions and 2–4 options bounds are hard schema constraints validated at the tool-call layer — the model cannot exceed them even if the user requests more. The guidance now says to split into multiple calls instead.
Evidence
Updated schema description (search for "hard schema constraints; do not exceed them even if the user requests more") — AskUserQuestion schema modification at line ~44768
Strings lifted out of the shipped bundle, so the claim above can be checked against them.