The harness delivers a finished background task to the agent by writing it as the user's next
message, so Claude's file holds a raw <task-notification> envelope as a user turn. Live it never
shows, because the same event travels separately as task:notification — it appeared only when a
refresh rebuilt the conversation from the file, as a bubble on the owner's side he never typed.
Same defect as INTERRUPTION_MARKERS and the same fix. Anchored to the start of the message so
quoting one inside a real message stays yours. Also skipped when picking a session's title, where
it is no more a title than a slash command is.
Verified against a live transcript: 38 user bubbles before, 32 after, the 6 removed being exactly
the notifications.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
pastilhasandClaude Opus 5
66b9cf634c