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 v2.1.242 Home All releases olderv2.1.241 v2.1.243newer
Claude Code v2.1.242

Sessions are told when Artifact comment replies change hands

You'll notice
Useful2 Signal3
Artifacts

You get on-screen notices when Artifact comment replies move to or from another session.

What

When one session of a conversation takes over the automatic replies to Artifact comments, the session that gave them up now says so, says when they come back, and says when they come back already stopped by the other session. Headless runs get this as log lines fed to the model, interactive runs get the same events as on-screen notices, and the wording distinguishes a handover from the two outcomes that already existed.

Details
  • Applies when a second session of the same conversation claims the automatic replies to Artifact comments, and again when that claim is released back.
  • In headless mode the events are written to the log and given to the model, starting with [headless] yielded Artifact comment replies for .
  • Interactive sessions carry the same three events as notices in the terminal rather than log lines.
  • A resume message can now report that another session of this conversation took over, alongside the existing cases of the replies being swept up and the watching task being killed.
  • The comment-monitor notice states that monitors stay off after you switch conversations until the Artifact is published again.
Evidence

[headless] yielded Artifact comment replies for , that another session of this conversation took over

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.242 →