The poll loop had a bare-text routing fallback in dispatchResultText: when
the agent produced text without <message to="..."> wrapping, it would auto-
route to the session's originating channel (via a frozen RoutingContext) or
to the single configured destination. This caused three problems:
1. Routing drift: RoutingContext was extracted once from the initial batch
and never refreshed. When the initial batch was a null-routed cron task
and a real chat arrived mid-query, replies were silently dropped to
scratchpad because the frozen routing had all-null fields.
2. Cross-channel thread bleed: sendToDestination applied a single
routing.threadId to every outbound message regardless of destination.
In agent-shared sessions (multiple channels sharing one session), one
channel's thread ID was stamped onto messages to a different channel.
3. Inconsistent formatting: task, webhook, and system messages had no
origin metadata in their formatted output, so the agent couldn't tell
which destination they came from — even when the underlying messages_in
rows carried routing fields.
Changes:
- Remove the bare-text routing fallbacks in dispatchResultText (both the
routing-based and single-destination shortcuts). All agent output must
be wrapped in <message to="name">...</message>. Bare text is scratchpad.
- Update buildDestinationsSection() to require explicit wrapping for all
groups, including single-destination. No more "no special wrapping
needed" shortcut.
- Resolve thread_id per-destination via resolveDestinationThread(), which
queries messages_in for the most recent message matching the target
channel+platform. Falls back to null (top-level channel message) when
no prior inbound exists for that destination.
- Extract originAttr() helper in formatter.ts and apply it to all message
types. Tasks now render as <task from="dest" time="...">, webhooks as
<webhook from="dest" source="..." event="...">, system responses as
<system_response from="dest" ...>. The agent always sees where a
message originated.
- Add a PreCompact shell hook (compact-instructions.ts) that outputs
custom compaction instructions, telling the compactor to preserve
recent message XML structure and routing metadata in the summary.
Wired via settings.json in the .claude-shared scaffold, with a
migration path (ensurePreCompactHook) for existing groups.
Relation to open PRs:
- #2277 (mergeRouting) becomes unnecessary — the routing fallback it
patches no longer exists. Can be closed.
- #2327 (post-compaction destination reminder) is complementary — it
handles the post-compaction push, this handles pre-compaction
instructions. Both can merge independently.
- #2328 (default routing instruction) is complementary — it adds "reply
to the from= destination" guidance to the multi-destination section.
Compatible with the unified instruction format here.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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