Optionalfinish_The overall finish reason for the completion.
Optionalrun_Number of model runs executed, including continuations triggered by tool calls.
Optionaltotal_Aggregate token usage across every run in the completion (including tool-call continuations), keyed by model ID.
OptionalusageToken usage for the final run, keyed by model ID.
Terminal event marking the end of a streaming chat completion (SSE
doneevent).