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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 v2.1.224

Messages relayed between your own sessions are now labelled as such

Under the hood
Useful3 Signal3
Cross-Session Messaging

Messages relayed from your other sessions are now tagged as peer sends rather than looking like scheduled triggers.

What

A message delivered to one session from another of your sessions, sent by the model through a coordinator SendMessage, now carries subkind: "peer-send-message" on its origin instead of being indistinguishable from a scheduled trigger. Anything reading origin.subkind should expect this additional value alongside scheduled-trigger.

Details
  • These deliveries keep the same prompt authority as task notifications but are now distinguishable on the wire.
  • The classifier stamps the new value when an inbound message arrives over the coordinator path, so the receive-side crossSessionInbound setting can apply to it.
Evidence

so the receive-side crossSessionInbound setting can apply to it

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 →