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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 v2.1.242

File-history restore rejects invalid session ids

You'll notice
Useful3 Signal2
File History

File-history restore now rejects bad session ids instead of copying backups anywhere.

What

Restoring from file history now validates the target session id before copying backups. An invalid id logs a warning and aborts the copy, so a crafted id cannot steer backup files into a directory of someone else's choosing.

Evidence

"FileHistory: refusing to copy backups on restore (invalid target session id)"

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 v2.1.242 →