You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
Session MessagingArea: what it touches
ImprovementsKind: in v2.1.248,
ImprovementsSection of the release
What
Cross-session messages sent by a sub-agent are now wrapped in an <agent-message from="..."> envelope before being sent, on both the bridge and local-socket paths. Previously the raw text went out unattributed, so the recipient could not tell which agent wrote it.
Evidence
agent-message
Strings lifted out of the shipped bundle, so the claim above can be checked against them.