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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 v2.1.221

Artifacts gain comment-thread reading and replying

Not switched on
Useful3 Signal4
Artifacts Notable

The artifact tool gains comments and reply actions with terminal rendering, though whether they're live is unresolved.

Artifact comments and reply actions are present, but their enablement check was not traced to a flag.

What

The artifact tool has new comments and reply actions, with a schema carrying threads and threads_dropped, tool-result text for the empty and degraded cases, and terminal renderers for thread counts and replies.

Details
  • comments is read-only and concurrency-safe; reply posts back to a thread
  • the empty case tells you viewers add threads from the artifact page in comment mode
  • threads_dropped covers the degraded case where not every thread came back
  • gated behind the artifact tool's own isEnabled check, which was not traced to a specific flag, so the live state here is unresolved
Evidence

No comment threads on this artifact yet. Viewers add them from the artifact page (comment mode).

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

See this entry in the whole of v2.1.221 →