The built-in AskUserQuestion tool in claude code 2.x reads
`updatedInput.answers` keyed by the question text and expects each
value to be a single string (multi-select selections joined by
commas), then echoes them verbatim from
`mapToolResultToToolResultBlockParam`. HAPI was filling `answers` as
`Record<questionIndex, string[]>`, so claude's lookup
`answers[question.question]` missed every entry, every question fell
through to `(no option selected)`, the filter dropped them all, and
the tool result content arrived as
"User has answered your questions: . You can now continue with
the user's answers in mind."
— a sentence with no answers. Sessions appeared to hang after the
user clicked an option, because claude had nothing actionable to act
on and never produced another turn.
Walk `input.questions` and rebuild the answers map keyed by the
question text, joining multi-select selections with commas. The
codex `request_user_input` path keeps its existing nested-shape
builder.
Verified end-to-end: re-spawned a HAPI session with the patched
binary, asked claude to use AskUserQuestion, picked options in the
web UI, and the turn resumed normally with answers visible in the
tool result content.
