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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 v2.1.232

@-mention another session or agent in your prompt

Use it now
Useful5 Signal4
Cross-Session Messaging Notable

Type @name in a prompt to complete and address a running agent, local, cloud or bridge session.

@
What

Typing @name or @"name with spaces" in a prompt now offers completions and resolves to a running agent, a local session, a cloud session or a bridge session. An optional [ref] suffix disambiguates when several candidates share a name.

Details
  • Sessions still using the automatically derived default name are excluded, so you cannot mention one by its directory name by accident.
  • Each attempt records telemetry under input_peer_at_mention with the outcome: resolved, needs a follow-up question, or not found.
  • Cloud and bridge candidates only appear when the cloud-session access gate above is satisfied; agents and local sessions do not depend on it.
Evidence

input_peer_at_mention

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 v2.1.232 →