Usability Heuristics

WHEN: A prototype, page, or flow needs an evidence-based usability check beyond accessibility and visual polish. This skill is the canonical AgentX heuristic-evaluation procedure consumed by prototype-audit Pass 7.

When to Use This Skill

• Before declaring a prototype review-ready
• During the prototype-auditor Pass 7
• When a stakeholder asks "is this actually usable?"
• When choosing between two layouts to ship

Not a replacement for user testing. It is a structured expert inspection that catches the obvious failures before they reach users.

Authoritative Sources