OptionalcreateServer-assigned time when the append commits. Values are nondecreasing within a session. Item listing orders by this timestamp; equal timestamps are resolved by committed append order.
OptionaldataComplete SDK-native, JSON-compatible item. The service stores and returns this value without
interpreting provider-specific fields such as type, role, or content.
OptionalitemStable service-generated item ID.
A transcript entry in a session's history.