OptionalmetadataOptionalprocessProjection of the return value to record instead of the value itself.
OptionalrunSpan run type. Deterministic steps are chains (the default).
OptionaltraceOptional non-PII projection of the arguments to record as the span's inputs. Defaults to no inputs — the return value (auto-captured) is usually the debug signal, and raw args (message histories, document maps) are large and low-signal even though the BAA permits them.
Extra non-PII metadata for the span.