MessageAppendedEvent

Distinguish UI streams, extension notifications, and external replies. See the guide.

class zett_agent.extensions.events.MessageAppendedEvent(message, timing, usage=None)

One newly produced raw message; restoration and compaction do not emit it.

Parameters:

• message (AnyMessage)

• timing (MessageTiming)

• usage (ModelUsage | None)

usage: ModelUsage | None

Provider-reported usage for an assistant model response. User, system, tool, and directly imported messages do not consume a model response.