Bedrock Agentcore > Structures > MessageMetadata MessageMetadata¶ Structure Class¶ MessageMetadata dataclass ¶ Metadata information associated with this message. Attributes¶ event_id instance-attribute ¶ event_id: str The identifier of the event associated with this message. message_index instance-attribute ¶ message_index: int The position of this message within that event's ordered list of messages.