Thumbnail

Your thumbnail is judged 200 pixels wide. That is how YouTube's sidebar shows it in a laptop window, and Instagram's profile grid shows a cover 129 pixels wide. I ran 941 thumbnails from AI-tool, SaaS and B2B-marketing channels through the same checks: about 1 in 10 had nothing readable at 200 px, and about 30% put words where the duration badge sits. So this skill does two jobs. It keeps every image readable where it is small: a headline of 16 arcminutes or more, contrast of 4.5:1 or better, nothing under the badge or the Shorts overlays, and AI-drawn words read back before anyone trusts them. And it makes the A/B set test ideas. A recoloured copy scored a fingerprint distance of 0 to 1 against its original, while 95% of real pairs scored 20 or more, so a set passes only when every pair clears 16. It also picks the poster frame, and @di-atomic/video-editor bakes it as frame 0. @di-atomic/youtube-content-creator writes the title and @di-atomic/media-generator renders the images.