Web Quality Audit
addyosmani/web-quality-skills
Run an evidence-led web quality audit covering performance, accessibility, SEO, best practices, and agentic browsing.
Fix PageSpeed Insights/Lighthouse accessibility "!" errors caused by contrast audit failures (CSS filters, OKLCH/OKLAB, low opacity, gradient text, image backgrounds).
Install Web Performance SEO
$ npx skills add aiskillstore/marketplace --skill web-performance-seo -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install aiskillstore/marketplace web-performance-seo --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/zhanlincui/web-performance-seo .claude/skills/web-performance-seo && rm -rf skills-srcUse ~/.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/
Install the "web-performance-seo" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/zhanlincui/web-performance-seo into .claude/skills/web-performance-seo/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "web-performance-seo", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/aiskillstore/marketplace/tree/main/skills/zhanlincui/web-performance-seoType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add aiskillstore/marketplace --skill web-performance-seo -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install aiskillstore/marketplace web-performance-seo --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/zhanlincui/web-performance-seo .agents/skills/web-performance-seo && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "web-performance-seo" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/zhanlincui/web-performance-seo into .agents/skills/web-performance-seo/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "web-performance-seo", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add aiskillstore/marketplace --skill web-performance-seo -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install aiskillstore/marketplace web-performance-seo --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/zhanlincui/web-performance-seo .cursor/skills/web-performance-seo && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "web-performance-seo" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/zhanlincui/web-performance-seo into .cursor/skills/web-performance-seo/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "web-performance-seo", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/aiskillstore/marketplace.git --path skills/zhanlincui/web-performance-seo--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add aiskillstore/marketplace --skill web-performance-seo -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install aiskillstore/marketplace web-performance-seo --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/zhanlincui/web-performance-seo .gemini/skills/web-performance-seo && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "web-performance-seo" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/zhanlincui/web-performance-seo into .gemini/skills/web-performance-seo/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "web-performance-seo", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install aiskillstore/marketplace web-performance-seoInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add aiskillstore/marketplace --skill web-performance-seo -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/zhanlincui/web-performance-seo .github/skills/web-performance-seo && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "web-performance-seo" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/zhanlincui/web-performance-seo into .github/skills/web-performance-seo/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "web-performance-seo", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add aiskillstore/marketplace --skill web-performance-seo -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install aiskillstore/marketplace web-performance-seo --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/zhanlincui/web-performance-seo .opencode/skills/web-performance-seo && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "web-performance-seo" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/zhanlincui/web-performance-seo into .opencode/skills/web-performance-seo/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "web-performance-seo", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
web-performance-seo- GitHub stars
- 430
- Used in
- 1 other repo
- Token cost
- ~671 tokens
- SKILL.md length
- 184 words
- Files
- 2
- Skills in repo
- 1,108
- Repo updated
- First seen
- Licence
- None found
At a glance
Fix PageSpeed Insights/Lighthouse accessibility "!" errors caused by contrast audit failures (CSS filters, OKLCH/OKLAB, low opacity, gradient text, image backgrounds).
- Works in 5 steps: Reproduce → Scan code for common triggers → Fix in priority order → …
- Accessibility-driven SEO/performance debugging and remediation
- SKILL.md covers When to use, Workflow, Fast scan commands and Fix patterns, plus 2 more sections
- Calls rg
What it does
Web Performance SEO is an agent skill from aiskillstore/marketplace. Fix PageSpeed Insights/Lighthouse accessibility "!" errors caused by contrast audit failures (CSS filters, OKLCH/OKLAB, low opacity, gradient text, image backgrounds). Use for accessibility-driven SEO/performance debugging and remediation.
Its SKILL.md is about 670 tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `skill-report.json`).
It sits in Frontend & Design, covering Web performance and Accessibility. The repository describes itself as: Security-audited skills for Claude, Codex & Claude Code. One-click install, quality verified.
When your agent uses it
- Accessibility-driven SEO/performance debugging and remediation
- Tasks that involve Web performance
- Tasks that involve Accessibility
Example prompts
- “/web-performance-seo”
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Reproduce
- Scan code for common triggers
- Fix in priority order
- Verify locally with Lighthouse/axe
- Verify in PSI after deployment
What it can do on your machine
Read from SKILL.md and the folder at commit ad8daf7. 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
Shell commands in SKILL.md call:
rg
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 Performance SEO loads about 671 tokens when it runs. Until then it costs about 65 tokens; SKILL.md has 184 words of instructions outside code blocks.
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
Without a licence we can't republish the file, so here is its outline and opening line. It has 184 words (~671 tokens).
- name
- web-performance-seo
Files
SKILL.md and 1 other file in skills/zhanlincui/web-performance-seo of aiskillstore/marketplace.
- SKILL.md
- skill-report.json
Open the folder on GitHubat commit ad8daf7
Used in 1 other repository
We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in aiskillstore/marketplace, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Web Performance SEO 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Web Performance SEO this skillaiskillstore/marketplace | 430 | 1 repos | ~671 | Automated safety check: Pass | None | |
| Web Quality Auditaddyosmani/web-quality-skills | 2.9k | — | ~2.6k | Automated safety check: Pass | MIT | |
| Web Quality Auditmidudev/100cosas.dev | 114 | 3 repos | ~1.7k | Automated safety check: Pass | MIT | |
| Optimize Loadtextura-agency/next16-claude-starter | 132 | — | ~4.6k | Automated safety check: Notes | Unlicense | |
| Accessibilityericrisco/rsc-harness | 167 | — | ~3.4k | Automated safety check: Pass | MIT | |
| Accessibility Checkmakifbaysal/tasktrooper | 109 | — | ~1.1k | Automated safety check: Pass | Apache-2.0 |
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Related
Categories
Questions about Web Performance SEO
What does Web Performance SEO do?
Fix PageSpeed Insights/Lighthouse accessibility "!" errors caused by contrast audit failures (CSS filters, OKLCH/OKLAB, low opacity, gradient text, image backgrounds). Web Performance SEO is an agent skill from aiskillstore/marketplace." errors caused by contrast audit failures (CSS filters, OKLCH/OKLAB, low opacity, gradient text, image backgrounds).
When should I use Web Performance SEO?
Web Performance SEO fits situations like: accessibility-driven SEO/performance debugging and remediation; tasks that involve Web performance; tasks that involve Accessibility.
How do I install Web Performance SEO in Claude Code?
Run `npx skills add aiskillstore/marketplace --skill web-performance-seo -a claude-code`. Or copy the skill folder (skills/zhanlincui/web-performance-seo in aiskillstore/marketplace) into .claude/skills/web-performance-seo in your project. Claude Code loads it when a task matches its description.
How do I install Web Performance SEO in Codex?
Run `npx skills add aiskillstore/marketplace --skill web-performance-seo -a codex`. Or copy the skill folder (skills/zhanlincui/web-performance-seo in aiskillstore/marketplace) into .agents/skills/web-performance-seo in your project. Codex loads it when a task matches its description.
Can I use Web Performance SEO 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 aiskillstore/marketplace --skill web-performance-seo -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-performance-seo, .gemini/skills/web-performance-seo, .github/skills/web-performance-seo and .opencode/skills/web-performance-seo in your project.
What does Web Performance SEO need to run?
Going by SKILL.md and its folder, Web Performance SEO needs the command-line tools its instructions call (rg).
Does Web Performance SEO 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 Performance SEO 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 Performance SEO use?
No licence was found for Web Performance SEO or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Web Performance SEO use?
About 671 tokens (SKILL.md is roughly 2.7k 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 Performance SEO?
Skills that share tags, products or a category with Web Performance SEO: Web Quality Audit (addyosmani/web-quality-skills, 2.9k stars), Web Quality Audit (midudev/100cosas.dev, 114 stars), Optimize Load (textura-agency/next16-claude-starter, 132 stars) and Accessibility (ericrisco/rsc-harness, 167 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Web Performance SEO?
aiskillstore (a GitHub organization) maintains it in aiskillstore/marketplace, which has 430 GitHub stars. The repository holds 1,108 skills in this directory. The repository was last updated on October 7, 2026.
Source: aiskillstore/marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.