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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.

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Claude Code v2.1.248

Unknown words in CLAUDE_CODE_DIR_SYNC_ENGINE are now called out in the session

Use it now
Useful2 Signal2
File Sync not in their notes

An unrecognised CLAUDE_CODE_DIR_SYNC_ENGINE value is now flagged in the status line.

CLAUDE_CODE_DIR_SYNC_ENGINE
What

If you set the CLAUDE_CODE_DIR_SYNC_ENGINE environment variable to something this build does not recognise, the status line now tells you the value changes nothing instead of silently ignoring it. Setting it to none switches file sync off on that machine; leaving it unset leaves sync on.

Details
  • The message appears only when unrecognised words are present, and a once-per-session helper keeps it from repeating.
  • Unknown words are sanitised to printable ASCII and only the first three are shown.
Evidence

which changes nothing; "none" switches file sync off on this machine, unset leaves it on.

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.248 →