Client-provided operation ID
Optionalcontext_Server's context ID
Optionaltask_Server's task ID
Agent ID
Task type/tool name
OptionalstatusTask status (completed, failed, needs_input, working, etc)
OptionalerrorError message if status is failed
Timestamp
Notification type
Optionalsequence_Sequence number of this notification
Optionalnext_When next notification is expected (not present for 'final')
Metadata for agent-initiated notifications Same as WebhookMetadata but includes notification-specific fields