Source Intelligence

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.

All of v2.1.224 Home All releases olderv2.1.223 v2.1.225newer

Tell another Claude session something and hear back when it was not delivered

You'll notice
Useful4 Signal3
Cross-Session Messaging

If another session holds, denies or ignores your message, you now see a warning instead of silence.

What

When you send a message to another Claude session and the recipient holds, denies, or lets it expire, your session now prints a warning line and quietly tells the model not to sit waiting for a reply. Receipts arrive in batches of up to 200 per status and are de-duplicated per recipient address.

Details
  • Two surfaces per receipt: a visible warning line, and a low-priority note injected into the conversation so the model stops blocking on an answer.
  • Covers held, denied and expired outcomes.
Evidence

[Cross-session delivery notice]

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 v2.1.224 →