Individual skill
youtube-thumbnails
Use when designing or fixing a YouTube thumbnail, making variants for an A/B test, or working out which thumbnail style wins on a channel — including the trap where CTR looks fine but the test keeps selecting the duller image on watch-time share. NOT pairing the title with the thumbnail as one click-promise (that is `youtube-packaging`), NOT channel positioning or niche (that is `youtube-strategy`), NOT setting a thumbnail through the Data API (that is `youtube-api`).
skills/youtube-thumbnails/SKILL.md
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- License
- MIT
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- youtube Declared skill tag
- thumbnails Declared skill tag
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SKILL.mdcore · 9,636 bytesevals/README.mddoc · 720 bytesevals/cases.yamlasset · 2,777 bytesreferences/composition-and-specs.mddoc · 3,242 bytesreferences/experiment-log-format.mddoc · 4,012 bytesscripts/verify.shruns · 3,456 bytes
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# YouTube thumbnails
Design thumbnails that survive the mobile feed, test them so the winner is a
*lesson* and not a coin flip, and write every outcome back to the channel's wiki
so the next thumbnail is evidence-led. A thumbnail you cannot learn from is half
wasted.
## The loop
This skill runs a closed loop, not a one-off design pass:
1. **Design** 2-3 candidate concepts that differ on exactly ONE testable axis.
2. **Test** them in YouTube Studio "Test & Compare".
3. **Log** the outcome to `02-DOCS/wiki/youtube/thumbnail-experiments.md`.