A/B Test Design — Measurable Interface Experiments

When to use it

Supply current and proposed UI, baseline conversion, traffic, minimum detectable effect and desired confidence/power. Produces an experiment specification before launch, complementing existing qualitative scenarios and click-test planning. A planning outline, not an analytics integration, sample-size calculator or statistical proof. Requires a validated calculation and instrumentation before running; fixed-horizon peeking warnings do not describe every sequential-test method. Low-traffic, foundational or ethically unsuitable changes need other validation approaches. Source documentation reviewed; not installed or runtime-tested. GitHub stars are repository-wide, not skill-specific.

Compatible agents

Claude CodeGemini CLI

Installation

In Claude Code run `/plugin marketplace add Owl-Listener/designer-skills`, then `/plugin install prototyping-testing@designer-skills`. Request the a-b-test-design skill for your proposed UI experiment. Install only the desired plugin, not the full suite. The upstream README also documents Gemini CLI extension copying; retain the complete extension when using that route.

Review the source and instructions before installing in your agent.

License

MIT

Last checked Nov 4, 2026.

Pair this skill with a visual reference

A skill guides how your agent works; a design reference shows the direction you want. Choose an example for a specific job, such as the headline hierarchy or form layout, and keep your project's existing design rules explicit.

Start with design references you can inspect, then use our guide to briefing an AI coding agent to turn observations into requirements. If you need implementation components, compare UI libraries for your stack.

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