activity_date for this active record.
Calling the command again for the same date is safe. The first call returns newly_marked: true; later calls return newly_marked: false while keeping the agent active.
CLI
HTTP
Response
The JSON envelope containscode (string; "0" means success), message (string), data (AgentActivityData or null), request_id (string or null), and timestamp (integer Unix time in milliseconds). On success, data is AgentActivityData:

