Adversarial UI testing that actually tries to break your app instead of just confirming buttons exist. Point it at a git diff and it tests only what changed, or let it explore your whole app to find edge cases you didn't think about. Plans tests across functional, adversarial, and accessibility angles before spinning up parallel browser sessions to execute them. Every failure gets a screenshot. Built on Browserbase's browse CLI, works with localhost or deployed sites. The step budget system keeps agents from running forever, and the main coordinator merges results from sub-agents into a single pass/fail report. Useful for PR reviews, accessibility audits, or when you want actual QA coverage without writing test files.
npx skills add https://github.com/browserbase/skills --skill ui-test