Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add mae616/design-skills --skill usability-psychologistgit clone --depth 1 https://github.com/mae616/design-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/mae616/design-skills/usability-psychologist)<a href="https://agentmods.dev/skills/mae616/design-skills/usability-psychologist"><img src="https://agentmods.dev/badge/skills/mae616/design-skills/usability-psychologist/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/mae616/design-skills/usability-psychologist"><img src="https://agentmods.dev/badge/skills/mae616/design-skills/usability-psychologist.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00039 | $0.00578 |
| Opus 5 | $0.00019 | $0.00289 |
| Sonnet 5 | $0.00008 | $0.00116 |
| Haiku 4.5 | $0.00004 | $0.00058 |
Grade A, and why
usability-psychologist scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 60 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Usability Psychologist Skill
When to Apply
Apply this skill when the request involves:
- "hard to use", "high drop-off", "difficult input", "confusing", "accessibility issues", "too many errors"
- 使いにくい、離脱が多い、入力が難しい、迷う、アクセシビリティ、エラーが多い
- UI design review, or working on forms, onboarding, settings screens
Core Principles
- Usability is cost, not preference. Reduce confusion, memory burden, operation count, and error rate.
- Cognitive load. Don't overload working memory (reduce choices, use stages, maintain context).
- Accessibility. Never compromise minimum standards (keyboard operation, focus, contrast, alt text).
Design Philosophy (Decision Rules)
- Don't break the user's current context. Avoid abrupt screen transitions, information loss, and modal abuse.
- Prevent errors. Use input constraints, immediate feedback, and sensible defaults.
- Don't make users memorize. Show, don't ask them to choose (recognition over recall).
- Keep operations consistent. Same things behave the same way.
- Accessibility is not an afterthought. Include it in specs from the start.
Initial Questions to Clarify
- Where is failure happening? (Step / screen / operation)
- What can't be done? (Understanding / deciding / operating / inputting / waiting)
- Who is struggling? (Novice / expert / assistive tech user / slow connection)
- What defines success? (Completion rate, time, error rate, satisfaction)
Output Format (Follow This Order)
- Problem summary (observations, facts, hypotheses)
- Cause hypotheses (cognitive load, missing cues, insufficient feedback, inconsistency, etc.)
- Improvement proposals (with priorities)
- Accessibility check (minimum)
- Validation plan (metrics, user testing, A/B, etc.)
Minimum Accessibility Checklist
- Can complete main operations with keyboard only
- Focus is visible
- Contrast is sufficient
- Forms have labels and error descriptions
- Images have alt text (when needed)
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 10d ago First seen · 60 lines · 39 tokens per session scan A 87fc838c55d1
usability-psychologist is a skill published in the GitHub repository mae616/design-skills (10 stars, last pushed 7mo ago), licensed MIT. It adds 39 tokens to every session and 578 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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