OptionalconversationOptionalentityOptionalloggerOptionalreferenceThe instant relative phrasing in the question ("last Tuesday") resolves against. Production leaves this unset and gets wall-clock; eval passes a frozen instant so a date-relative question stays reproducible.
OptionaluserAuthenticated user id — used for observability annotations only.
Client-generated id shared by every turn of one chat session. Becomes the LangSmith
thread_idso the Threads view groups the whole conversation.