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Usability

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flitzrrr
usability

Heuristic evaluation, conversion optimization, form design, error handling, and usability as a measurable quality criterion per ISO 9241 and Nielsen heuristics.

Overview

Publisherflitzrrr
Repositoryfrontend-design-skills
Skill nameusability
Stars
9
Forks
2
Bundled files
Instructions only
LicenseMIT
Links
Skill sourceRepository
  • Markdown instructions

    A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.

  • Works with any LLM

    AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.

  • Self-contained

    Everything the model needs lives in the instructions — no extra files to sync.

  • Open source

    Published by flitzrrr on GitHub. Read the source before you install it.

Installation

Install the Usability AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

1

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

  1. Open the app and go to Plugins → Skills.
  2. Choose "Install from GitHub".
  3. Paste the skill folder URL below and confirm.
    https://github.com/flitzrrr/frontend-design-skills/tree/main/skills-src/usability
  4. Enable the skill in any chat where you want it available.
Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.
2

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills
git clone --depth 1 https://github.com/flitzrrr/frontend-design-skills.git /tmp/frontend-design-skills
mkdir -p .claude/skills
cp -r /tmp/frontend-design-skills/skills-src/usability .claude/skills/usability
Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Usability in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Usability on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Usability is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

  • Loaded only when it is needed

    The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.

  • Switch models mid-chat

    Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

Usability

Usability is not a gut feeling — it is a measurable quality criterion. Every interaction must work without cognitive effort.

Scope

Use this skill when you:

  • Evaluate a website or individual pages for usability
  • Design or optimize forms
  • Design error states and feedback mechanisms
  • Conduct a heuristic evaluation based on Nielsen's heuristics
  • Aim to increase conversion rates through improved usability
  • Need to make content scannable and readable

Principles

1. Don't Make Me Think

Every interaction works without cognitive effort. Users don't read — they scan. Users don't choose optimally — they take the first available path.

2. Effectiveness Before Efficiency Before Satisfaction

The three ISO 9241 criteria build upon each other. First, the task must be achievable; then with minimal effort; then with satisfaction.

3. Conventions Beat Creativity

Users have learned patterns (logo top-left = homepage, search top-right, shopping cart icon). Only break these with demonstrable justification.

4. Aesthetic-Usability Effect

Aesthetically pleasing interfaces are perceived as more usable. Beauty is not a luxury — it is a usability factor.

5. Error Tolerance as a Requirement

Users make mistakes. Every interaction must be error-tolerant and provide clear feedback.

6. Measurability

Usability is measured through task completion, error rate, task time, and satisfaction scores.

Rules

DO: Enforce Consistency

  • USE uniform fonts, colors, design elements, and writing conventions across all pages.
  • ENSURE that similar page types have identical layouts.
  • USE a consistent interaction model (same button styles, same hover effects, same form logic).

DO: Optimize Above the Fold

  • PLACE the most important message, the primary CTA, and a clear headline in the visible area without scrolling.
  • AVOID "Welcome" as the first headline. Use benefit-oriented statements instead.

DO: Keep Forms Minimal

  • ASK only for required fields. Every additional field reduces the conversion rate.
  • MARK required fields clearly.
  • USE clear field labels — never use placeholders as the only labels.
  • DISPLAY error messages directly at the affected field.
  • PRESERVE correctly filled fields when errors occur.

DO: Design Error States

  • CREATE custom 404 pages with onward navigation.
  • PROVIDE clear feedback for every user action (success, error, loading).
  • PREVENT auto-playing videos or audio.
  • NEVER show empty states without guidance for next steps.

DO: Make Content Scannable

  • STRUCTURE text with subheadings, lists, tables, and visual anchor points.
  • LIMIT line lengths to 8-10 words per line.
  • USE left-aligned text (no justified text on the web).
  • SET body text font size to a minimum of 18px.

DON'T: Introduce Unnecessary Complexity

  • AVOID unnecessary animations, frames, and pop-ups.
  • AVOID underlines except for links.
  • AVOID generic stock photos with no informational value.
  • AVOID hidden or unexpected navigation.

DON'T: Ignore Load Times

  • KEEP load times under 3 seconds.
  • USE descriptive URLs.
  • OPTIMIZE images and media for fast delivery.

Patterns

Heuristic Evaluation (Nielsen)

Systematically evaluate against the 10 usability heuristics: visibility of system status, match between system and real world, user control and freedom, consistency and standards, error prevention, recognition rather than recall, flexibility and efficiency of use, aesthetic and minimalist design, help users recognize and recover from errors, help and documentation. For details, see references/nielsen-heuristiken.md.

Progressive Disclosure

For complex content: show only the essentials first. Offer "Learn more" options for details. Examples: FAQ accordions, expandable product details, multi-step forms.

Inline Validation

For forms with more than 3 fields: validate inputs immediately on field blur. Show success (green checkmark) and errors (red message with correction suggestion) directly at the field.

Social Proof for Conversion

On landing pages, product pages, and contact pages: place testimonials, ratings, customer counts, or logos near the CTA. Use real, verifiable statements.

Anti-Patterns

Mystery Meat Navigation

Navigation without recognizable links or with cryptic icons lacking labels. Users must guess where a click leads. Solution: Clear, descriptive link labels. Always combine icons with text labels.

Form Overkill

Too many fields, unnecessary required fields, multi-page forms without progress indicators. Each additional field reduces the completion rate by approximately 5-10%. Solution: Only necessary fields. Progress bars for multi-step forms.

Auto-Play Media

Videos or audio start automatically on page visit. Solution: Always load media in a paused state. Display the play button prominently.

False Affordance

Elements look clickable but are not (or vice versa). Solution: Buttons look like buttons, links look like links. No decorative elements with interaction styling.

Endless Scroll Pages Without Orientation

Very long pages without anchor links or a back-to-top button. Solution: Table of contents, sticky navigation, back-to-top button after a defined scroll depth.

Checklist

Technical

  • Load time under 3 seconds (Lighthouse)
  • Descriptive URLs without cryptic parameters
  • No unnecessary animations or pop-ups
  • Custom 404 page with onward navigation
  • Clear feedback for all user actions
  • Responsive design tested across all breakpoints

Content and Design

  • Font size at least 18px for body text
  • Sufficient contrast (minimum 4.5:1)
  • Consistent design across all pages
  • Text structured into scannable sections

Navigation

  • Functional, intuitive main menu
  • Breadcrumbs for more than 2 levels
  • Links consistently styled
  • Logo linked to homepage

Forms

  • Only necessary fields present
  • Required fields clearly marked
  • Inline error messages directly at the field
  • Correct inputs preserved on error
  • Success confirmation after submission

Testing

  • Heuristic evaluation against Nielsen's heuristics completed
  • Tested on various devices and browsers
  • A/B testing planned for key conversion elements

Cross-References

  • ux-design -- UX design as the overarching discipline
  • accessibility -- Accessibility as a subset of usability
  • responsive-design -- Technical prerequisite for cross-device usability
  • navigation-design -- Navigation as a core usability element
  • web-typography -- Typography rules for readability
  • landing-pages -- Conversion optimization on landing pages

Frequently asked questions

What does the Usability AI skill do?

Heuristic evaluation, conversion optimization, form design, error handling, and usability as a measurable quality criterion per ISO 9241 and Nielsen heuristics.

Why use Usability on TypingMind?

Because you install it once and use it with any model. Usability is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Usability in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/flitzrrr/frontend-design-skills/tree/main/skills-src/usability. TypingMind reads its SKILL.md and installs it as a skill you can enable per chat.

Which AI models can use Usability?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Usability?

As many as you like. As long as a model supports skills, you can use Usability with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Usability AI skill free?

Yes. It is published on GitHub by flitzrrr under the MIT license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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