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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.242 ·

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

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

You'll notice Improvements
JSON All of v2.1.242
You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
Cloud SessionsArea: what it touches
ImprovementsKind: in v2.1.242,
ImprovementsSection of the release
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
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 →

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