A webhook route that delivers to telegram/discord/... runs in an ephemeral
webhook:<route>:<delivery_id> session. The delivered text never reaches
the target chat's own session, so when the user replies there ("so he's
out?") the agent has no idea it just sent them anything and asks what
they mean.
After a successful cross-platform send, mirror the delivered text into the
target chat's transcript as a labelled user turn ("[Webhook delivery:
<route>]\n..."), the same path and role convention cron briefs use
(cron.scheduler_delivery._maybe_mirror_cron_delivery, #2221). Best-effort:
never fails the delivery, skipped when the chat has no session yet.
Route opt-out via mirror_to_session: false. delivery_info now carries the
route name and the flag for both agent-run and deliver_only routes.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CZ15jNgPUHdPsMw4wWon6v
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