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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

All of v2.1.251 Home All releases olderv2.1.250
Claude Code v2.1.251

Background file sync now steps aside for commands in flight

You'll notice
Useful2 Signal2
Cloud Sync

Background file sync now skips itself while a sync-sensitive command is running.

What

The background pass that syncs your working directory to a cloud session now runs as a distinct "watch" pass. When a command that is sensitive to syncing is already running, the watch pass is skipped rather than run, and it tells you sync keeps trying at each sync point instead of using the message-blocking wording reserved for foreground sends.

Details
  • The skip is recorded with the reason held_for_command.
  • Foreground triggers (sending a message, creating or capturing a session) are unaffected and still run their pass immediately.
  • The trigger type is set internally by whichever code path starts the pass; there is no setting for it.
Evidence

held_for_command

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.251 →