ProgressStatus

A progress step's status. Open: new values may be added. succeeded and failed are final.

A string. The SDKs keep a value they do not know yet as the string itself (Python: an unknown member carrying it), so a newer server never breaks an older SDK.

Value	Description
running	The step is running.
succeeded	The step finished. Final.
failed	The step failed. Final.

Used by ResumeConversationStream, SendMessage.