phase property
Phase is what shape the run is in: running, blocked, done, error, or unknown when nothing has estimated it yet. blocked means the transcript shows the run waiting on something — an approval, a credential, an answer — which is the one state the running surface cannot report about itself. error only ever comes from the session's own terminal status.
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? phase;