executionMode property
ExecutionMode switches between one-shot and long-running. The RESULTING mode+schedule are validated together, so switching to long-running without a stored or supplied cron is refused rather than accepted into an agent the scheduler would skip forever. A switch INTO long-running counts against the per-org cap and can be a 409.
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? executionMode;