Individual skill
usability-check
Evaluate user-facing interfaces against Nielsen's 10 Usability Heuristics. Complements /mycelium:service-check (Downe = service-level quality, Nielsen = interface-level quality).
plugins/mycelium/skills/usability-check/SKILL.md
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# Usability Heuristic Evaluation
Evaluate interface-level usability using Jakob Nielsen's 10 heuristics (1994; titles unchanged, definitions refined 2020). This complements Downe's 15 Good Services principles: Downe checks end-to-end SERVICE quality, Nielsen checks screen-level INTERFACE quality. Both are needed for user-facing work.
## When to Use
- During L4 Delivery for any user-facing work (REVIEW via G-V10)
- After UI implementation, before marking delivery complete
- When users report confusion or friction
## The 10 Heuristics
### 1. Visibility of System Status
The system should always keep users informed about what is going on through timely and appropriate feedback.
- [ ] Loading states visible for any operation > 1 second