Retrieve agent trace

Interaction steps including tool calls from this turn

Emoji reactions on this trace's bot response

Outcome of the agent's session-start hook for this trace's thread. The hook runs at most once per thread, so every trace in the same thread carries the same value. Absent entirely for organizations without the session-start hook feature. For organizations that have it, null means the agent has no session-start hook configured, or the hook never ran for this thread.