After a failed heartbeat, Claude Code goes back to checking in more often.
What's wrong with this entry?
When the CLI heartbeat has been told by the server it can beat less often and a beat then fails with anything other than a 429, the longer idle interval is given up and the shorter starting interval takes effect immediately.
- Reported as a warning event named
cli_heartbeat_idle_reverted_on_failure. - A failed liveness-probe beat is now counted separately from a normal failed beat.
cli_heartbeat_idle_reverted_on_failure
Strings lifted out of the shipped bundle, so the claim above can be checked against them.