Study of 117 UI design skills finds they mostly change layout, not the model's copy

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A developer built SkillArena to test 117 front-end design skills for coding agents by sending five fixed briefs to one model at default settings, with a no-skill control. Across 1,770 generated pages, the landing page brief produced the same 'Stop asking...' opening in 317 of 354 pages, including the no-skill control and 94 of the 117 skills. Only two skills avoided that opening in every run, and all three runs placed the product keyword in the H1 for the SEO skill. The author concludes that visual design skills rarely change messaging, while skills that alter the model's goal, such as ranking for a keyword or following a copy framework, may. Output length also varied by brief: skills roughly doubled page size on small open-ended briefs like the mobile screen and form, but most skills shortened the analytics dashboard, where the model already wrote the most on its own.

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