When a gateway session with resume_pending=True is not recovered within the
auto-continue freshness window (e.g. because repeated API calls timed out on a
large context), get_or_create_session correctly creates a new session. However
two gaps existed:
1. The user received no notification — resume_pending_expired fell through the
generic "inactive for Xh" else-branch in run.py, which produces wrong wording
and (for session_reset.mode: none users) is gated on policy.notify that
evaluates to False.
2. The old session was ended in state.db with the hardcoded generic reason
"session_reset", making it impossible to distinguish from a normal idle/daily
reset in post-mortem analysis.
Fix:
- gateway/run.py: add an explicit resume_pending_expired case for the agent
context note ("gateway restart recovery timed out") and the user-facing
notification. Always notify for this reason — like suspended — because the
user had an active session that was silently replaced.
- gateway/session.py: pass auto_reset_reason as the DB end_reason instead of
the hardcoded "session_reset", so all auto-reset paths are auditable.
- tests: extend TestResumePendingExpiredAutoReset in test_session_reset_notify.py
with five new cases that cover the reason, activity flag, DB end_reason,
non-regression of the idle path, and freshness-disabled bypass.
Closes#58933
Co-authored-by: Cursor <cursoragent@cursor.com>
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