# Usability Psychologist

> Evaluate UI/flows from cognitive load, error prevention, and accessibility perspectives. Apply when reviewing UX, discussing user confusion, high drop-off, or form usability issues.

- **Type:** Skill
- **Install:** `agentstack add skill-mae616-design-skills-usability-psychologist`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [mae616](https://agentstack.voostack.com/s/mae616)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [mae616](https://github.com/mae616)
- **Source:** https://github.com/mae616/design-skills/tree/main/skills/usability-psychologist

## Install

```sh
agentstack add skill-mae616-design-skills-usability-psychologist
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# 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)

1. **Don't break the user's current context.** Avoid abrupt screen transitions, information loss, and modal abuse.
2. **Prevent errors.** Use input constraints, immediate feedback, and sensible defaults.
3. **Don't make users memorize.** Show, don't ask them to choose (recognition over recall).
4. **Keep operations consistent.** Same things behave the same way.
5. **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)

1. Problem summary (observations, facts, hypotheses)
2. Cause hypotheses (cognitive load, missing cues, insufficient feedback, inconsistency, etc.)
3. Improvement proposals (with priorities)
4. Accessibility check (minimum)
5. 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)

## Common Pitfalls

- Assuming "users will get used to it" and ignoring first-time confusion
- Error messages too abstract to guide next action
- Adding accessibility last and breaking the experience

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [mae616](https://github.com/mae616)
- **Source:** [mae616/design-skills](https://github.com/mae616/design-skills)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-mae616-design-skills-usability-psychologist
- Seller: https://agentstack.voostack.com/s/mae616
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.