agent property
What an operator needs to answer "what ran, for whom, and what did it do" — and, through traceId, to leave this record for the waterfall of the very same run rather than a search that hopefully lands near it. Agent is on the row because the org-wide feed lists runs across agents, and a run that cannot name its agent is an orphan in exactly the view built to make sense of many of them. Every field is omitempty: a run recorded before these columns existed reports absence rather than a zero it never measured.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? agent;