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.
Working-directory sync will not write into an ignored path
You'll notice
Useful2Signal2
Cloud Sessions
Working-directory sync refuses to copy files into paths your ignore rules exclude.
What's wrong with this entry?
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What
When copying files into the synced working directory, Claude now checks the destination and every parent directory it would create against your ignore rules, and fails with the error code WORKING_DEST_IGNORED rather than writing there.
Details
Sits alongside the existing checks for escaping the parent directory and for symlinked destinations.
Evidence
dest ancestor resolves into an ignored path
Strings lifted out of the shipped bundle, so the claim above can be checked against them.