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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

Messages sent by an agent are labelled with the session address

You'll notice
Useful2 Signal2
Cross-Session Messaging

Messages a subagent sends under the session address are now labelled in your transcript.

What

When a subagent sends a message using the session's own address, Claude Code now attaches a note for the model and a suffix in the transcript, and distinguishes a one-way send from one whose replies come back into the main conversation.

Details
  • Two variants: a send that expects no reply, and one marked as having replies routed into the main conversation.
  • The same helper produces both the model-facing text and the display suffix, so what you see and what the model sees stay in step.
Evidence

replies go to the main conversation

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 →