You'll notice
A new diagnostics row reports auto mode's server classifier as Enabled or Disabled
What
A new diagnostics helper builds a status row labeled "Auto mode server" that reports either "Enabled" or "Disabled", based on a check of whether the auto-mode classifier resolves to server-side ("arbiter") mode and whether the current model is excluded from it.
Why
This gives users a direct way to see, in diagnostics output, whether their session is actually using the server-side auto-mode classifier or not, rather than having to infer it from behavior.
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Anthropic's release notes agree
Added an Auto mode server row to /status showing whether this session's auto mode classifier runs on the server