Agent skill

Web Interface Guidelines

by benchflow-ai in benchflow-ai/skillsbench

Vercel's comprehensive UI guidelines for building accessible, performant web interfaces.

MITAuto-check passedFrontend & Design

Install Web Interface Guidelines

skills CLI
$ npx skills add benchflow-ai/skillsbench --skill web-interface-guidelines -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install benchflow-ai/skillsbench web-interface-guidelines --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/benchflow-ai/skillsbench.git skills-src && mkdir -p .claude/skills && cp -r skills-src/tasks/fix-visual-stability/environment/skills/web-interface-guidelines .claude/skills/web-interface-guidelines && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
web-interface-guidelines
GitHub stars
1.8k
Token cost
~722 tokens
SKILL.md length
277 words
Files
2
Skills in repo
180
Repo updated
First seen
Licence
MIT

At a glance

Vercel's comprehensive UI guidelines for building accessible, performant web interfaces.

  • Building UI components for compliance with best practices around accessibility
  • SKILL.md covers Quick Reference - Visual… and Full Rules
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Visual stability

What it does

Web Interface Guidelines is an agent skill from benchflow-ai/skillsbench. Vercel's comprehensive UI guidelines for building accessible, performant web interfaces. Use this skill when reviewing or building UI components for compliance with best practices around accessibility, performance, animations, and visual stability.

Its SKILL.md is about 720 tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file.

It sits in Frontend & Design, covering Frontend development and Accessibility. It works with Vercel. The repository describes itself as: SkillsBench evaluates how well skills work and how effective agents are at using them. The licence is MIT.

When your agent uses it

  • Building UI components for compliance with best practices around accessibility
  • Visual stability

Example prompts

  • “/web-interface-guidelines”

What it can do on your machine

Read from SKILL.md and the folder at commit 9a1f4dd. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Web Interface Guidelines loads about 722 tokens when it runs. Until then it costs about 68 tokens; SKILL.md has 277 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~68
When it runs · the whole SKILL.md, loaded when a task matches
~722

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from benchflow-ai/skillsbench at commit 9a1f4dd, republished under its MIT licence (© benchflow-ai). 277 words, ~722 tokens.

Download SKILL.mdSave it as .claude/skills/web-interface-guidelines/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
web-interface-guidelines
description
Vercel's comprehensive UI guidelines for building accessible, performant web interfaces. Use this skill when reviewing or building UI components for compliance with best practices around accessibility, performance, animations, and visual stability.

Web Interface Guidelines

Review UI code for compliance with Vercel's web interface standards.

Quick Reference - Visual Stability

IssueRule
Images without dimensions<img> needs explicit width and height (prevents CLS)
Font loading flashCritical fonts: <link rel="preload" as="font"> with font-display: swap
Large listsVirtualize lists >50 items (content-visibility: auto)
Layout reads in renderNo getBoundingClientRect, offsetHeight in render path

Full Rules

Images
  • <img> needs explicit width and height (prevents CLS)
  • Below-fold images: loading="lazy"
  • Above-fold critical images: priority or fetchpriority="high"
Performance
  • Large lists (>50 items): virtualize (virtua, content-visibility: auto)
  • No layout reads in render (getBoundingClientRect, offsetHeight, offsetWidth, scrollTop)
  • Batch DOM reads/writes; avoid interleaving
  • Add <link rel="preconnect"> for CDN/asset domains
  • Critical fonts: <link rel="preload" as="font"> with font-display: swap
Accessibility
  • Icon-only buttons need aria-label
  • Form controls need <label> or aria-label
  • Interactive elements need keyboard handlers (onKeyDown/onKeyUp)
  • <button> for actions, <a>/<Link> for navigation (not <div onClick>)
  • Images need alt (or alt="" if decorative)
Focus States
  • Interactive elements need visible focus: focus-visible:ring-* or equivalent
  • Never outline-none / outline: none without focus replacement
  • Use :focus-visible over :focus (avoid focus ring on click)
Animation
  • Honor prefers-reduced-motion (provide reduced variant or disable)
  • Animate transform/opacity only (compositor-friendly)
  • Never transition: all—list properties explicitly
Forms
  • Inputs need autocomplete and meaningful name
  • Use correct type (email, tel, url, number) and inputmode
  • Never block paste (onPaste + preventDefault)
  • Labels clickable (htmlFor or wrapping control)
Content Handling
  • Text containers handle long content: truncate, line-clamp-*, or break-words
  • Flex children need min-w-0 to allow text truncation
  • Handle empty states—don't render broken UI for empty strings/arrays
Anti-patterns (flag these)
  • user-scalable=no or maximum-scale=1 disabling zoom
  • transition: all
  • outline-none without focus-visible replacement
  • Images without dimensions
  • Large arrays .map() without virtualization
  • Form inputs without labels
  • Icon buttons without aria-label

© benchflow-ai, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file in tasks/fix-visual-stability/environment/skills/web-interface-guidelines of benchflow-ai/skillsbench.

  • SKILL.md
  • LICENSE

Open the folder on GitHubat commit 9a1f4dd

Compare with similar skills

Web Interface Guidelines next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Web Interface Guidelines compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Web Interface Guidelines this skillbenchflow-ai/skillsbench1.8k—~722Automated safety check: PassMIT
Frontend Engineer Workflownanocoai/nanoclaw31k—~1.5kAutomated safety check: PassMIT
Frontend UI FunctionalvictorGPT/vibeusage131—~939Automated safety check: PassMIT
Frontend Designjjyaoao/HelloAgents3.2k1 repos~7kAutomated safety check: PassMIT
Super UI UX Designsyahiidkamil/Software-Engineer-AI-Agent-Atlas397—~9kAutomated safety check: PassNone
Glycemicgpt UI Foundationlumose-health/GlycemicGPT141—~707Automated safety check: PassGPL-3.0

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Works with

Questions about Web Interface Guidelines

What does Web Interface Guidelines do?

Vercel's comprehensive UI guidelines for building accessible, performant web interfaces. Web Interface Guidelines is an agent skill from benchflow-ai/skillsbench. Vercel's comprehensive UI guidelines for building accessible, performant web interfaces.

When should I use Web Interface Guidelines?

Web Interface Guidelines fits situations like: building UI components for compliance with best practices around accessibility; visual stability.

How do I install Web Interface Guidelines in Claude Code?

Run `npx skills add benchflow-ai/skillsbench --skill web-interface-guidelines -a claude-code`. Or copy the skill folder (tasks/fix-visual-stability/environment/skills/web-interface-guidelines in benchflow-ai/skillsbench) into .claude/skills/web-interface-guidelines in your project. Claude Code loads it when a task matches its description.

How do I install Web Interface Guidelines in Codex?

Run `npx skills add benchflow-ai/skillsbench --skill web-interface-guidelines -a codex`. Or copy the skill folder (tasks/fix-visual-stability/environment/skills/web-interface-guidelines in benchflow-ai/skillsbench) into .agents/skills/web-interface-guidelines in your project. Codex loads it when a task matches its description.

Can I use Web Interface Guidelines in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add benchflow-ai/skillsbench --skill web-interface-guidelines -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/web-interface-guidelines, .gemini/skills/web-interface-guidelines, .github/skills/web-interface-guidelines and .opencode/skills/web-interface-guidelines in your project.

What does Web Interface Guidelines need to run?

SKILL.md names no scripts, command-line tools or credentials: Web Interface Guidelines is instructions for the agent only.

Does Web Interface Guidelines access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Web Interface Guidelines safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Web Interface Guidelines use?

Web Interface Guidelines is published under the MIT licence (from the LICENSE file in the skill folder). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Web Interface Guidelines use?

About 722 tokens (SKILL.md is roughly 2.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Web Interface Guidelines?

Skills that share tags, products or a category with Web Interface Guidelines: Frontend Engineer Workflow (nanocoai/nanoclaw, 31k stars), Frontend UI Functional (victorGPT/vibeusage, 131 stars), Frontend Design (jjyaoao/HelloAgents, 3.2k stars) and Super UI UX Design (syahiidkamil/Software-Engineer-AI-Agent-Atlas, 397 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Web Interface Guidelines?

benchflow-ai (a GitHub organization) maintains it in benchflow-ai/skillsbench, which has 1,832 GitHub stars. The repository holds 180 skills in this directory. The repository was last updated on July 23, 2026.

Source: benchflow-ai/skillsbench on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.