Interrupt a running Anthropic session before archiving it - #71465
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The API refuses to archive **or** delete a session while its status is ``running``, rejecting both with a 400. ``AnthropicAgentSessionOperator`` treats archiving as best-effort teardown on every failure path, so a session that will not stop on its own is left behind with no way to release it -- and it keeps accruing ``active_seconds``, which the SDK describes as the duration the session's runtime cost is priced on. Observed directly: two sessions halted by a $0.01 budget sat at status ``running`` for over 40 minutes with model spend frozen at the ceiling while ``active_seconds`` kept climbing. ``archive`` and ``delete`` both returned 400. Sending ``user.interrupt`` moved them to ``idle`` immediately, after which archiving succeeded. ``AnthropicHook.archive_session`` now interrupts and retries when the first archive attempt fails, and ``interrupt_session`` exposes the event on its own. The retry is bounded, so an unarchivable session still surfaces its error rather than looping. This is reachable well beyond budgets -- any session still working when a task fails, times out, or is killed hits the same 400 -- but a budget halt makes it routine, because that is a session which has stopped spending without stopping. The interrupt-then-archive sequence was verified by hand against the live API on two genuinely stuck sessions. Its wiring through ``archive_session`` is covered by unit tests rather than a live run.
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The API refuses to archive **or** delete a session while its status is ``running``, rejecting both with a 400. ``AnthropicAgentSessionOperator`` treats archiving as best-effort teardown on every failure path, so a session that will not stop on its own is left behind with no way to release it -- and it keeps accruing ``active_seconds``, which the SDK describes as the duration the session's runtime cost is priced on. Observed directly: two sessions halted by a $0.01 budget sat at status ``running`` for over 40 minutes with model spend frozen at the ceiling while ``active_seconds`` kept climbing. ``archive`` and ``delete`` both returned 400. Sending ``user.interrupt`` moved them to ``idle`` immediately, after which archiving succeeded. ``AnthropicHook.archive_session`` now interrupts and retries when the first archive attempt fails, and ``interrupt_session`` exposes the event on its own. The retry is bounded, so an unarchivable session still surfaces its error rather than looping. This is reachable well beyond budgets -- any session still working when a task fails, times out, or is killed hits the same 400 -- but a budget halt makes it routine, because that is a session which has stopped spending without stopping. The interrupt-then-archive sequence was verified by hand against the live API on two genuinely stuck sessions. Its wiring through ``archive_session`` is covered by unit tests rather than a live run.
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The API refuses to archive **or** delete a session while its status is ``running``, rejecting both with a 400. ``AnthropicAgentSessionOperator`` treats archiving as best-effort teardown on every failure path, so a session that will not stop on its own is left behind with no way to release it -- and it keeps accruing ``active_seconds``, which the SDK describes as the duration the session's runtime cost is priced on. Observed directly: two sessions halted by a $0.01 budget sat at status ``running`` for over 40 minutes with model spend frozen at the ceiling while ``active_seconds`` kept climbing. ``archive`` and ``delete`` both returned 400. Sending ``user.interrupt`` moved them to ``idle`` immediately, after which archiving succeeded. ``AnthropicHook.archive_session`` now interrupts and retries when the first archive attempt fails, and ``interrupt_session`` exposes the event on its own. The retry is bounded, so an unarchivable session still surfaces its error rather than looping. This is reachable well beyond budgets -- any session still working when a task fails, times out, or is killed hits the same 400 -- but a budget halt makes it routine, because that is a session which has stopped spending without stopping. The interrupt-then-archive sequence was verified by hand against the live API on two genuinely stuck sessions. Its wiring through ``archive_session`` is covered by unit tests rather than a live run.
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Problem
The API refuses to archive or delete a session while its status is
running, rejectingboth with a 400.
AnthropicAgentSessionOperatortreats archiving as best-effort teardown onevery failure path, so a session that will not stop on its own is left behind with no way to
release it -- and it keeps accruing
active_seconds, which the SDK describes as theduration the session's runtime cost is priced on.
Evidence
Two sessions halted by a $0.01 budget sat at status
runningfor over 40 minutes. Modelspend was frozen at the ceiling, but
active_secondskept climbing across successivesamples (777 to 838 seconds over one 60-second window). Both
archiveanddeletereturned400. Sending
user.interruptmoved them toidleimmediately, after which archivingsucceeded.
Solution
AnthropicHook.archive_sessionnow interrupts and retries when the first archive attemptfails, and
interrupt_sessionexposes the event on its own. The retry is bounded, so asession that genuinely cannot be archived still surfaces its error rather than looping.
This is reachable well beyond budgets: any session still working when a task fails, times
out, or is killed hits the same 400. A budget halt just makes it routine, because that is a
session which has stopped spending without stopping.
Scope
The interrupt-then-archive sequence was verified by hand against the live API on two
genuinely stuck sessions. Its wiring through
archive_sessionis covered by unit testsrather than a live run.