Gateway-level truncation (MAX_PLATFORM_OUTPUT=4000) was pre-empting
adapter-side message splitting. Discord and Telegram both chunk long
content natively in their send() via truncate_message(), but the
delivery router truncated to 3800 chars + footer before the adapter
ever saw the full payload — so long cron output was cut short instead
of being delivered as multiple messages (issue #50126).
Changes:
- HERMES_DELIVERY_MAX_PLATFORM_OUTPUT env var makes the cap configurable
(default 4000, backward compatible). Set to 0 to disable truncation.
- TRUNCATED_VISIBLE (3800) removed — visible portion now derived
dynamically from max_output minus the actual footer length.
- New BasePlatformAdapter.splits_long_messages capability flag (default
False). Adapters that chunk in send() set True; delivery skips
truncation for them but still saves full output to disk as audit.
- Flagged Discord and Telegram (both verified to chunk in send()).
Fixes#50126
86e4521cb1