Cloud file sync copies your project files into a cloud session started with --cloud. Sync now signs the synced files with a key tied to your computer. If that cannot be set up, sync stops with a message explaining why. This happens when the cloud did not register your computer as a device for the session, or its device key could not be read. The message suggests running without sync: CLAUDE_CODE_DIR_SYNC_ENGINE=none claude --cloud.
This part of file sync is off unless it is switched on remotely.
When device registration fails, sync now stops rather than sending unsigned files. The message gives you a way to keep working without sync.
tengu_violin_wood 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 v2.1.284: 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 v2.1.284. It isn't a statement about your account. What a flag value here can and cannot tell you
Whether this is controlled by the remote switch it appears to be is not confirmed.