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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 v2.1.247

Cloud session messages wait for plugin registration before sending

You'll notice
Useful3 Signal2
Cloud Sessions

Your first messages to a cloud session now wait until its plugins have finished registering.

What

Your first messages to a cloud session are now held until the session's plugin instance has finished registering, rather than being sent into an instance that is not registered yet.

Details
  • Each outbound send races a registration check against the message's released, withdrawn and decided outcomes.
  • Previously the only gate on this path was the folder-sync seed gate, which withholds rather than sends.
  • Applies on the remote session path only; no flag.
Evidence

onRelease: "send"

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 v2.1.247 →