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Annotations let you attach comments 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 (one page at a time); click a point on an image or figure; or turn on Annotate and click an element in a rendered HTML report. Tables and other artifact types can’t be annotated. Session transcripts can also be annotated.

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Leaving an annotation

  • Select content and click the Annotate pill.
  • Type your comment and press Cmd/Ctrl+Enter (or click Save).
  • The annotation appears as a highlighted badge (text) or numbered pin (images). Hover to read it; click to Edit or Delete.

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Sending annotations to Claude

Saving an annotation doesn’t send it. Pending annotations collect in an N comments chip on the composer and are sent with your next message. This lets you batch several annotations and send them together, or send them one at a time. Claude receives each annotation with its filename, the quoted selection (or marked image), and your note. Once sent, annotations are consumed: they leave the artifact and appear as cards on the message. Annotations don’t have threads or a resolve state. To revise an artifact again after Claude updates it, annotate the new version. Limits: annotation text is capped at 1,000 characters. PDF selections can’t cross page breaks. Annotations aren’t included in downloads and don’t appear in the Files grid.