Source Intelligence

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.

All of v2.1.228 Home All releases olderv2.1.227 v2.1.229newer
Claude Code v2.1.228

Agent list explains that names are how you address an agent

You'll notice
Useful2 Signal3
Agents

Claude gets clearer guidance on addressing agents by exact name across sessions and machines.

What

The description of the agent-listing tool was rewritten to spell out the four kinds of row it can return: subagents running inside this session, other sessions on this machine, cloud sessions, and Remote Control sessions on other machines. It states that a row's name is the address to send to, that it must be copied exactly, and that the short reference in brackets should only be added when two rows share a name.

Details
  • Part of the text is filled in at runtime with the actual name of the send tool.
Evidence

each row labeled by kind. Names are the address

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 v2.1.228 →