{"version":"2.1.251","anchor":"publish-prompt-now-advertises-a-thumbnail-field","canonical_anchor":"publish-prompt-now-advertises-a-thumbnail-field","heading":"Publish prompt now advertises a thumbnail field","tier":"notice","area":"Artifacts","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.251\/e\/publish-prompt-now-advertises-a-thumbnail-field","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.251","markdown":"### Publish prompt now advertises a thumbnail field\n\nPublishing reports back how many custom thumbnails it included.\n\n**What**\n\nThe instructions Claude follows when publishing an artifact now list a Thumbnail field, and the tool's summary counts how many were supplied, so a publish reports back that it included \"a custom thumbnail image\" or \"two custom thumbnail images\".\n\n**Details**\n\n- Sits behind an internal capability check, so the field is only advertised when that check passes.\n- The count covers both the light and dark thumbnail.\n\n**Evidence**\n\n`a custom thumbnail image`\n\n- Area: Artifacts\n- Tier: You'll notice\n- Useful: 2\/5\n- Signal: 2\/5"}