Claude Code adds a keepalive so remote classifier calls don't time out during long coordination checks
Claude Code has a new keepalive mechanism for the 'api_call' activity classifier, a background process that periodically checks in with a remote service during coordination sessions. While a classifier call to that remote service is still in progress, Claude Code now holds a session-activity hold (called classifier-check-hold) open and restarts a deadline timer so the check isn't cut off early. If the hold isn't cleared before the deadline, it logs an event called session_activity_classifier_hold_expired.
A new environment variable, CLAUDE_CODE_AUTO_MODE_CLASSIFIER_OVERLAP, controls whether more than one classifier call can run at the same time within a lane (a track of concurrent work).
This reduces the chance that a slow remote classifier call gets treated as timed-out or dropped mid-check, and gives a way to see when that still happens via the new hold-expired log event.
tengu_ccr_classifier_keepalive_enabled Off in both readingsThe flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.
This account: off · anonymous baseline: off · compiled default in v2.1.280: off
These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.
Read once, for one account on one subscription tier, against v2.1.280. It isn't a statement about your account. What a flag value here can and cannot tell you
New in this build: tengu_ccr_classifier_keepalive_enabled