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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

A failed inbound-support lookup counts as unreported

You'll notice
Useful2 Signal2
Cross-Session Messaging

If checking whether a peer session can receive messages fails, you get the unconfirmed-delivery caveat.

What

When the check for whether a peer session can receive cross-session messages fails outright, Claude Code logs the failure and treats that session as not having reported support, so the send carries the same unconfirmed-delivery caveat for the model and the shorter note on screen.

Details
  • The log line is [agents:cloud] warm inbound-report lookup failed.
  • No gate: a lookup failure always falls back to the cautious wording rather than assuming delivery worked.
Evidence

[agents:cloud] warm inbound-report lookup failed

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 →