After an interrupt, Claude keeps emitting messages about the request it
was told to kill — the notification for the tool it just stopped,
trailing assistant output. The router classified them as new work and
opened an autonomous turn, but the only message that could close that
turn is the interrupt result shouldSuppressStaleResult drops, so the
agent reported running forever.
Pre-existing, but masked until the steer-discard fix: the undiscarded
steer used to resume the turn and its result accidentally closed the
phantom one. pendingInterruptAbort already marks the window where
messages belong to the dying request, so the router now refuses to open
a turn while it is set.
Mohamed Boudra
f9e1def954