SendNodeInput

Process scope: the subflow that undoes this node's effect if the instance is cancelled or fails later.

From each outlet the node type declares to the id of the next node; every declared outlet is mapped.

Named ZEN expressions evaluated before the node runs, typed against the node's input schema.

Writes fields of the node's output to declared slots (conversation) or vars (process).

What to say; exactly one of template and prompt.

Every node that waits has one, with a default per type.