usability-tester

Validates that users can successfully complete core tasks through systematic observation and expert evaluation. Covers moderated and unmoderated testing, heuristic evaluation, accessibility checks, and issue severity scoring. Not a substitute for analytics or A/B testing -- those measure what happens, usability testing reveals why.

When to use: Testing user flows, validating designs, identifying friction points, running heuristic evaluations, ensuring users can complete core tasks, planning and executing usability test sessions.

When NOT to use: Analytics or A/B test setup, visual design critique without task-based evaluation, automated UI testing (use a testing framework), performance benchmarking.

進行可用性測試並透過系統觀察識別使用者體驗問題。在測試使用者流程、驗證設計、識別摩擦點、執行啟發式評估或確保使用者可以完成核心任務時使用。用於測試計劃、有聲思考協議、任務場景、嚴重性評級、可訪問性評估。 來源：oakoss/agent-skills。