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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

Attaching to a cloud session fails fast on a bad session id

You'll notice
Useful2 Signal2
Cloud Sessions

Attaching to a cloud session with an unknown or malformed id is refused immediately with a message.

What

Attaching to a remote session used to log a failed lookup and carry on over the websocket anyway. An unknown session id or a malformed one is now refused outright with a message saying so; other lookup errors still fall through to the websocket as before.

Details
  • The refusal records a tengu_remote_attach_session_rejected event carrying the reason.
Evidence

cloud attach refused: the id names no session of this account, or is malformed

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

See this entry in the whole of v2.1.242 →