Schema Markup
alirezarezvani/claude-skills
When the user wants to implement, audit, or validate structured data (schema markup) on their website.
A skill your agent uses when reviewing image assets, markup, and CDN or build transforms related to Serve images from a CDN.
MITAuto-check passed
Install Image Cdn
$ npx skills add thedaviddias/Front-End-Checklist --skill image-cdn -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist image-cdn --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/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/image-cdn .claude/skills/image-cdn && 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 "image-cdn" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/image-cdn into .claude/skills/image-cdn/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "image-cdn", 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/thedaviddias/Front-End-Checklist/tree/main/skills/image-cdnType 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 thedaviddias/Front-End-Checklist --skill image-cdn -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist image-cdn --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/image-cdn .agents/skills/image-cdn && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "image-cdn" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/image-cdn into .agents/skills/image-cdn/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "image-cdn", 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 thedaviddias/Front-End-Checklist --skill image-cdn -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist image-cdn --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/image-cdn .cursor/skills/image-cdn && 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 "image-cdn" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/image-cdn into .cursor/skills/image-cdn/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "image-cdn", 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/thedaviddias/Front-End-Checklist.git --path skills/image-cdn--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 thedaviddias/Front-End-Checklist --skill image-cdn -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist image-cdn --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/image-cdn .gemini/skills/image-cdn && 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 "image-cdn" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/image-cdn into .gemini/skills/image-cdn/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "image-cdn", 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 thedaviddias/Front-End-Checklist image-cdnInstalls 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 thedaviddias/Front-End-Checklist --skill image-cdn -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/image-cdn .github/skills/image-cdn && 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 "image-cdn" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/image-cdn into .github/skills/image-cdn/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "image-cdn", 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 thedaviddias/Front-End-Checklist --skill image-cdn -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install thedaviddias/Front-End-Checklist image-cdn --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/image-cdn .opencode/skills/image-cdn && 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 "image-cdn" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/image-cdn into .opencode/skills/image-cdn/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "image-cdn", 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
image-cdn- GitHub stars
- 74k
- Token cost
- ~395 tokens
- SKILL.md length
- 150 words
- Files
- 2 (incl. references)
- Skills in repo
- 390
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when reviewing image assets, markup, and CDN or build transforms related to Serve images from a CDN.
- Reviewing image assets
- SKILL.md covers Quick Reference, Check, Fix and Explain, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Build transforms related to Serve images from a CDN
What it does
Image Cdn is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing image assets, markup, and CDN or build transforms related to Serve images from a CDN. Check encoded size, rendered size, loading strategy, and above-the-fold impact together.
Its SKILL.md is about 400 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/rule.md`).
The repository describes itself as: 🗂 The essential checklist for modern web development, for humans and AI agents. The licence is MIT.
When your agent uses it
- Reviewing image assets
- Build transforms related to Serve images from a CDN
Example prompts
- “/image-cdn”
What it can do on your machine
Read from SKILL.md and the folder at commit e8d14d0. 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
Links to these hosts (documentation or services it may open):
frontendchecklist.io
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
Image Cdn loads about 395 tokens when it runs, and up to ~1.5k if it reads all its reference files. Until then it costs about 51 tokens; SKILL.md has 150 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
The full file from thedaviddias/Front-End-Checklist at commit e8d14d0, republished under its MIT licence (© thedaviddias). 150 words, ~395 tokens.
Download SKILL.mdSave it as
.claude/skills/image-cdn/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- image-cdn
- description
- Use when reviewing image assets, markup, and CDN or build transforms related to Serve images from a CDN. Check encoded size, rendered size, loading strategy, and above-the-fold impact together.
- metadata.category
- images
- metadata.priority
- high
- metadata.difficulty
- intermediate
- metadata.estimatedTime
- 30
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/images/image-cdn
Serve images from a CDN
Image CDNs automatically optimize, resize, and convert images on-the-fly—delivering the smallest file in the best format without manual processing.
Quick Reference
- Use image CDN for automatic format conversion (WebP, AVIF)
- Generate responsive sizes on-the-fly via URL parameters
- CDN edge caching delivers images from nearest location
- Popular options: Cloudinary, Imgix, Cloudflare Images, Vercel
Check
Verify if images are served from a CDN or image optimization service.
Fix
Configure an image CDN like Cloudinary, Imgix, or Cloudflare Images for automatic optimization.
Explain
Explain how image CDNs provide on-the-fly optimization, resizing, and format conversion.
Code Review
Review image assets, markup, and delivery configuration related to Serve images from a CDN. Flag exact files or components where format choice, sizing, or loading behavior violates the rule, and describe how to confirm the fix in DevTools.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/images/image-cdn
© thedaviddias, 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 (references) in skills/image-cdn of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Image Cdn 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 |
|---|---|---|---|---|---|---|
| Image Cdn this skillthedaviddias/Front-End-Checklist | 74k | — | ~395 | Automated safety check: Pass | MIT | |
| Schema Markupalirezarezvani/claude-skills | 28k | 1 repos | ~2.9k | Automated safety check: Pass | MIT | |
| Schema Markup Generatorsickn33/agentic-awesome-skills | 47k | 1 repos | ~2.1k | Automated safety check: Pass | MIT | |
| Remotion Markupremotion-dev/remotion | 63k | 2 repos | ~4.6k | Automated safety check: Pass | Custom licence | |
| Cdn Setupsickn33/agentic-awesome-skills | 47k | 2 repos | ~2.9k | Automated safety check: Pass | MIT | |
| Schema Markupmohitagw15856/pm-claude-skills | 1.4k | — | ~838 | Automated safety check: Pass | MIT |
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- Official
Remotion Markup
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Content, animation and effects best practices. An agent skill from remotion-dev/remotion.
Cdn Setup
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Configure CDNs for content delivery. An agent skill from sickn33/agentic-awesome-skills.
Schema Markup
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Generate structured-data (Schema.org / JSON-LD) markup to win rich results in search.
Schema Markup
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Audits article and blog pages for visible publish dates, Article JSON-LD with datePublished and dateModified, and Open Graph time tags, then fixes what is missing.
FAQPage Schema Markup
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Adds, checks and fixes FAQPage JSON-LD on pages with visible question-and-answer sections so it matches what readers see and can qualify for rich results.
Favicon Audit and Setup
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Checks that a site's favicon is linked, reachable and large enough for Google search results, and sets up ICO, SVG and Apple touch icon files when they are missing.
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Audits article pages for freshness signals, covering the Last-Modified header, Article JSON-LD dateModified and a visible last-updated date, and fixes mismatches.
Geo Meta Tags Audit
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Audits and fixes geo.region, geo.placename and geo.position meta tags on regional pages, noting where they help (Bing) and where they do not (Google).
Improve a Front-End Checklist Rule
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Scores and rewrites a Front-End Checklist rule MDX file against a scored quality rubric, replacing generic stub prompts with specific, actionable ones.
Questions about Image Cdn
What does Image Cdn do?
A skill your agent uses when reviewing image assets, markup, and CDN or build transforms related to Serve images from a CDN. Image Cdn is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing image assets, markup, and CDN or build transforms related to Serve images from a CDN.
When should I use Image Cdn?
Image Cdn fits situations like: reviewing image assets; build transforms related to Serve images from a CDN.
How do I install Image Cdn in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill image-cdn -a claude-code`. Or copy the skill folder (skills/image-cdn in thedaviddias/Front-End-Checklist) into .claude/skills/image-cdn in your project. Claude Code loads it when a task matches its description.
How do I install Image Cdn in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill image-cdn -a codex`. Or copy the skill folder (skills/image-cdn in thedaviddias/Front-End-Checklist) into .agents/skills/image-cdn in your project. Codex loads it when a task matches its description.
Can I use Image Cdn 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 thedaviddias/Front-End-Checklist --skill image-cdn -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/image-cdn, .gemini/skills/image-cdn, .github/skills/image-cdn and .opencode/skills/image-cdn in your project.
What does Image Cdn need to run?
SKILL.md names no scripts, command-line tools or credentials: Image Cdn is instructions for the agent only.
Does Image Cdn access the network?
SKILL.md names 1 domain. As links in the text: frontendchecklist.io. This is read from the text; nothing was executed.
Is Image Cdn 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 Image Cdn use?
Image Cdn is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Image Cdn use?
About 395 tokens (SKILL.md is roughly 1.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.2k tokens, read only when the agent opens those files.
What are the alternatives to Image Cdn?
Skills that share tags, products or a category with Image Cdn: Schema Markup (alirezarezvani/claude-skills, 28k stars), Schema Markup Generator (sickn33/agentic-awesome-skills, 47k stars), Remotion Markup (remotion-dev/remotion, 63k stars) and Cdn Setup (sickn33/agentic-awesome-skills, 47k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Image Cdn?
thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,421 GitHub stars. The repository holds 390 skills in this directory. The repository was last updated on October 6, 2026.
Source: thedaviddias/Front-End-Checklist on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.