Branch

Pick one subtree out of several, with a no-match outcome and a confidence floor.

LIVE DEMO →which chart answers the question

Branch asks a Choice question and renders the matching child. It is the right primitive when the options are unordered and exactly one should win.

<Branch
  ask="Which view best answers the question in `data.question`?"
  data={{ question }}
  minConfidence={0.5}
  onResolved={(cost) => console.log(cost.shareUsd)}
>
  <Option k="line" when="The question is about a trend across many time periods.">
    <LineChart />
  </Option>
  <Option k="table" when="The question needs exact per-row numbers.">
    <Table />
  </Option>
  <Option fallback>
    <Table />
  </Option>
</Branch>

Props

prop	type	what it does
ask	string	The question. Backticked paths scope which state it receives.
data	Json	Local state for this judgment, read as `data.*`.
minConfidence	number	Below this, the fallback renders instead of the winner.
pending	ReactNode	Rendered while resolving. Defaults to the fallback.
onVerdict	(v) => void	The selected key, confidence, distribution, and why.
pick	Channel[]	Narrow which state channels it receives. Default: all of them.
onResolved	(cost) => void	What the request that answered this Branch cost.
id	string	A readable id for the Inspector. Does not affect fixtures.

How it becomes a question

your code	the question object
ask="…"	instructions
<Option k="line" when="…">	criteria.line
(automatic)	criteria.__none__
data={{ … }}	state.data.<id>
minConfidence, fallback	never sent — applied to the answer in code

When the fallback renders

Confidence is below minConfidence — the model reports it is not sure, so do not act on a guess.
The model picked the no-match option, meaning none of your options fit the state.
The judgment failed outright. The failure is recorded and visible in the Inspector rather than swallowed.

Low confidence on a Choice often means no option is a clear winner, not that the model is broken. Several acceptable alternatives spread probability too — a harmless preference does not need a high floor.