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AutopilotMonitor/docs/agent
Oliver Kieselbach 3aa8b95676 fix(agent): narrow the Shell-Core replay to the Hello-wizard rail
Round-four review, confirmed — and the cause sits a layer below where I had been
fixing. The IsBackfill return added last round only guarded the coordinator's own
completion logic. Upstream of it, ShellCoreTracker still raised
FinalizingSetupPhaseTriggered, the coordinator still forwarded EspExited to the
adapter before that return, and the adapter discards the args entirely
(OnEspExited(...) => EmitEspExiting()). So a replayed exit still arrived at the
reducer as an ordinary, unmarked EspExiting.

There it is decisive: HandleEspExitingV1 passes espFinalExitInFlight: true for
every arriving exit, and IsPostAccountSetupFinalExit orders exits by ingest
ordinal rather than timestamp — so a historic exit replayed today reads as
post-AccountSetup by construction. With state restored from the snapshot
(AccountSetup entered, a genuine IME user session, desktop arrived) arm C of
ShouldTransitionToAwaitingHello opens on the Device→Account handoff. The reducer
is itself a completion gate and cannot tell the two apart, so the fix has to be
upstream.

The replay is therefore narrowed to what is provably safe: the Hello-wizard start
(62404). That fact is conservative — it vetoes a premature "Hello is disabled"
skip and can never by itself complete a session, so replaying it can only make the
agent wait longer. It is also the observation session 772fe502 wrote the replay
for. A 62407 is no longer raised at all, neither exit nor failure: the exit
because Windows writes the identical description for the intermediate and the
final one and nothing downstream can order it, the failure because re-injecting it
as fresh can fail a session that recovered on retry (ANALYZE-ESP-006). Skipped
records are reported once as an agent_trace with counts and bounds — silently
dropping evidence is how this class of bug survives.

The cross-layer proof is now a pair, as the review asked:
ClassicEspExitingOnRestoredStateTests pins that the reducer opens on any arriving
exit (including one with an hour-old source timestamp), and
ShellCoreTrackerReplayScopeTests pins that the replay never produces one.

Dead machinery removed with it: EspExitedEventArgs.IsBackfill, allowEspExit, the
newest-exit selection, the IsBackfill return. The method is now called
BackfillRecentHelloWizardStart.

One pre-existing integration test drove EspExited through HandleBackfillRecord
because the replay is easier to call than the event-log watcher, and its class doc
claimed that was the production path — it never was, the replay had no caller when
that test was written. Switched to the live path and the doc corrected.

Agent V2.Core 2361, DecisionCore 538, Backend 4287, all green.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-19 19:05:14 +02:00
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