_authed_call checks the dead-grant marker before calling, retries a
confirmed auth failure once after a forced refresh, and records the
failure for the one-time notice. Operations re-resolve their peer and
session objects inside the call, so a retry after a client rebuild no
longer reuses objects bound to the old transport. Tool handlers now
return an explicit auth error instead of an empty result, and non-auth
failures keep their fail-open behavior.
Erosika
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