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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 v2.1.234

Comments on artifacts can start a Claude Code session from the desktop app

You'll notice
Useful3 Signal4
Artifacts

Commenting on an artifact in the desktop app can now launch a Claude Code session from that comment.

What

The desktop app can hand the CLI a prompt built from a comment you left on an artifact, and the CLI now recognises that handoff, picks up the comment thread it refers to, and marks the prompt so its own comment watcher does not reply to the same comment a second time. This path is desktop-app only; other clients never see it.

Details
  • The seeded prompt is identified by a first line of [Artifact comment sent to Claude], followed by Artifact: , Comment thread: and Sent to Claude at: lines, which the CLI parses to claim the thread.
  • The message flag is seeded_summon in the SDK message schema, documented as @internal Desktop host only: the host's own seeded summon.
  • Gated on the client identifying itself as the desktop host (client platform desktop_app). None of this existed in the previous release.
Evidence

[Artifact comment sent to Claude]

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

See this entry in the whole of v2.1.234 →