From mycelium
Evaluates services or features against Lou Downe's 15 principles, checking discoverability, expectations, accessibility, dark patterns, and human help paths.
npx claudepluginhub haabe/mycelium --plugin myceliumThis skill uses the workspace's default tool permissions.
Evaluate against Lou Downe's 15 principles.
Conducts structured UX evaluations using heuristics, cognitive walkthroughs, anti-pattern detection, and task analysis. Scores, prioritizes issues, and routes to Intent specialist skills.
Evaluates interfaces against Nielsen's 10 usability heuristics, produces severity-rated findings (0-4: Cosmetic to Catastrophic), and generates remediation recommendations with effort estimates.
Applies UX principles, Nielsen's heuristics, and frameworks to review interface usability, plan user flows, evaluate designs for web, mobile, CLI, AI products.
Share bugs, ideas, or general feedback.
Evaluate against Lou Downe's 15 principles.
For each principle, assess: Pass / Partial / Fail / N/A
Easy to find: Can users find this service without knowing its name?
Clearly explains its purpose: Is it immediately clear what this does?
Sets expectations: Do users know what will happen?
Enables completion: Can users finish what they came to do?
Familiar: Does it work the way users expect?
No prior knowledge needed: Can a new user succeed?
Agnostic of org structures: Are internal boundaries invisible?
Minimum steps: Is every step necessary?
Consistent: Is language/design uniform throughout?
No dead ends: Is there always a next step?
Usable by everyone: Is it accessible and inclusive?
Encourages right behaviors: Does design nudge good outcomes?
Responds to change: Can it adapt?
Explains decisions: Are automated decisions transparent?
Easy to get human help: Can users reach a person?
/mycelium:ice-score.Running at L3 catches service design issues BEFORE delivery, not after. A solution that can't meet "enable completion" (P4) or "no dead ends" (P10) has a design problem, not just a quality problem.
## Service Check: [Service Name]
| # | Principle | Status | Notes |
|---|-----------|--------|-------|
| 1 | Easy to find | Pass/Partial/Fail | ... |
...
| 15 | Human help | Pass/Partial/Fail | ... |
Score: [X/15 Pass, Y/15 Partial, Z/15 Fail]
Priority fixes: [top 3 items to address]
APPEND a ### Service Check entry to .claude/harness/decision-log.md with: principles assessed, scores, priority fixes, overall service quality rating.