You'll notice
Artifact publish results can now prompt the model to preview a file before it goes live
What
Artifact publish results can now include a previewHint flag. When set, the result text tells the model that the file hasn't been previewed yet this session, and suggests using the preview action to catch layout or loading problems before viewers see them, since certain capability calls only work once the artifact is actually published.
Why
This nudges the model to check its work with a preview before publishing, reducing the chance that broken layouts or load errors reach an artifact's viewers.