The outbox a RunHandle replies through; the outbox of outbox fits. The handle adds runId to the options.
outbox
runId
Queues a message in a thread and sends it.
The thread.
The Markdown text.
Further options of the outbox, with runId set by the handle.
The outbox entry.
The outbox a RunHandle replies through; the outbox of
outboxfits. The handle addsrunIdto the options.