Under the hoodTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
Cross-Session MessagingArea: what it touches
New FeaturesKind: in v2.1.224,
New FeaturesSection of the release
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.
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeAdded crossSessionInbound and dialogExpiry settings: cross-session messages sent to a session running with bypassed permissions are held for…
