MachineEventName

The name of an event a transition handles (1.58.0): a deterministic event such as slot.filled, tool.returned, timer.<name>, decision.verdict, turn.closed, action.done or transfer.failed, a proposal (propose.transition, propose.handoff, observer.proposed, observer.takeover), or a custom name a Policy raises. The reserved session.started and session.ended are never named.

A value of type string.