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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 v2.1.248

Cross-session messages from sub-agents now say whose address they were sent under

You'll notice
Useful2 Signal2
Cross-Session Messaging

Messages a sub-agent sends elsewhere now say they went under the session's address.

What

When a sub-agent sends a message to another session, the tool result now explains that the message went out under the session's address rather than the agent's, and where any reply will land. It is on for everyone on this build, with no flag.

Details
  • Applies to both delivery paths: the inter-session bridge and the local socket path.
  • Two wordings: a one-way form used when the bridge only has a one-way route, or when the socket path finds no messaging socket of its own, and the default form.
  • The user-visible display string is the parenthetical variant.
Evidence

; sent under this session's address: any reply will be delivered to this session's main conversation, not to this agent

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 v2.1.248 →