Type Alias: UntilGuard

UntilGuard = (ctx) => boolean

Defined in: src/core-flow/Loop.ts:88

Predicate evaluated AFTER each body iteration. Return true to exit the loop.

latestOutput is the body's STRING output — by design (B15): the whole core-flow layer composes Runner<{ message: string }, string>, and the Loop chart's outputMapper coerces any non-string body output to ''. For structured exit conditions today, have the body emit JSON (e.g. an Agent with .outputSchema(...)) and parse inside the guard:

.until(({ latestOutput }) => {
  try { return (JSON.parse(latestOutput) as { done: boolean }).done; }
  catch { return false; } // not JSON (yet) — keep looping
})

A typed guard (Loop<T> with a structured body output) would require genericizing the Runner output contract shared by Sequence / Parallel / Conditional — tracked as a future enhancement, not in core today.

Parameters

ctx

iteration

number

latestOutput

string

startMs

number

Returns

boolean