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Comments let you pin notes to specific parts of an artifact instead of describing a location in prose. Select text in a Markdown, plain-text, LaTeX, or code file; select text in a PDF; click a point on an image or figure; or turn on Comment and click an element in a rendered HTML report. You can also comment on session transcripts. You can’t comment on tables or other artifact types.

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Leaving a comment

  • Select content in an artifact and click Comment.
  • Type your comment and press Enter (or click Save). Press Shift+Enter for a new line.
  • The comment appears as a highlighted badge (text) or numbered pin (images). Hover to read it; click to Edit or Delete.

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Sending comments to Claude

Saving a comment doesn’t send it. Pending comments appear above the message box and are sent with your next message. This lets you batch several comments and send them together, or send them one at a time. Claude receives each comment with its filename, the quoted selection (or marked image), and your note. Once sent, comments leave the artifact and appear as cards on the message. Comments don’t have threads or a resolve state. To revise an artifact again after Claude updates it, comment on the new version. Limits: comment text is capped at 1,000 characters. Comments aren’t included in downloads and don’t appear in Files.