React Doctor
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Scans React code for lint, accessibility, bundle size and architecture issues, reports a health score and checks that changes do not lower it.
When the user wants to optimize images for search engines and performance.
Install Image Optimization
$ npx skills add kostja94/marketing-skills --skill image-optimization -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install kostja94/marketing-skills image-optimization --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/kostja94/marketing-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/seo/on-page/image-optimization .claude/skills/image-optimization && 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-optimization" agent skill from https://github.com/kostja94/marketing-skills/tree/main/skills/seo/on-page/image-optimization into .claude/skills/image-optimization/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "image-optimization", 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/kostja94/marketing-skills/tree/main/skills/seo/on-page/image-optimizationType 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 kostja94/marketing-skills --skill image-optimization -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install kostja94/marketing-skills image-optimization --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kostja94/marketing-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/seo/on-page/image-optimization .agents/skills/image-optimization && 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-optimization" agent skill from https://github.com/kostja94/marketing-skills/tree/main/skills/seo/on-page/image-optimization into .agents/skills/image-optimization/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "image-optimization", 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 kostja94/marketing-skills --skill image-optimization -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install kostja94/marketing-skills image-optimization --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kostja94/marketing-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/seo/on-page/image-optimization .cursor/skills/image-optimization && 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-optimization" agent skill from https://github.com/kostja94/marketing-skills/tree/main/skills/seo/on-page/image-optimization into .cursor/skills/image-optimization/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "image-optimization", 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/kostja94/marketing-skills.git --path skills/seo/on-page/image-optimization--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 kostja94/marketing-skills --skill image-optimization -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install kostja94/marketing-skills image-optimization --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kostja94/marketing-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/seo/on-page/image-optimization .gemini/skills/image-optimization && 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-optimization" agent skill from https://github.com/kostja94/marketing-skills/tree/main/skills/seo/on-page/image-optimization into .gemini/skills/image-optimization/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "image-optimization", 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 kostja94/marketing-skills image-optimizationInstalls 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 kostja94/marketing-skills --skill image-optimization -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/kostja94/marketing-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/seo/on-page/image-optimization .github/skills/image-optimization && 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-optimization" agent skill from https://github.com/kostja94/marketing-skills/tree/main/skills/seo/on-page/image-optimization into .github/skills/image-optimization/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "image-optimization", 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 kostja94/marketing-skills --skill image-optimization -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install kostja94/marketing-skills image-optimization --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kostja94/marketing-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/seo/on-page/image-optimization .opencode/skills/image-optimization && 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-optimization" agent skill from https://github.com/kostja94/marketing-skills/tree/main/skills/seo/on-page/image-optimization into .opencode/skills/image-optimization/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "image-optimization", 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-optimization- GitHub stars
- 1k
- Token cost
- ~2.7k tokens
- SKILL.md length
- 1,053 words
- Files
- 1
- Skills in repo
- 102
- Repo updated
- First seen
- Licence
- MIT
At a glance
When the user wants to optimize images for search engines and performance.
- Works in 9 steps: Discovery & Indexing → Format & Performance → Alt Text → …
- Wants to optimize images for search engines and performance
- SKILL.md covers Scope, Initial Assessment, 1. Discovery & Indexing and 2. Format & Performance, plus 9 more sections
- Reaches sitemaps.org and google.com
What it does
Image Optimization is an agent skill from kostja94/marketing-skills. When the user wants to optimize images for search engines and performance. Also use when the user mentions "image SEO," "alt text," "image captions," "figcaption," "image optimization," "WebP," "lazy loading," "LCP," "image sitemap," "responsive images," "srcset," "image format," or "hero image optimization." For CWV, use core-web-vitals.
Its SKILL.md is about 2.7k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Frontend & Design, covering Web performance. The repository describes itself as: Agent Skills for Marketing — SEO, Social, Influencer & More. 160+ open-source skills for SEO, content, 40+ page types, paid ads, channels, and strategies. Add project context… The licence is MIT.
When your agent uses it
- Wants to optimize images for search engines and performance
- The user mentions image SEO
- Image optimization
- Responsive images
Example prompts
- “image SEO,”
- “alt text,”
- “image captions,”
- “/image-optimization”
Workflow steps
9 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 8dd89c5. 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 (its code samples are html, xml and json).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
sitemaps.orggoogle.comschema.org
Also links to:
developers.google.comsemrush.comweb.devsearchengineland.com
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 Optimization loads about 2.7k tokens when it runs. Until then it costs about 90 tokens; SKILL.md has 1,053 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 kostja94/marketing-skills at commit 8dd89c5, republished under its MIT licence (© kostja94). 1,053 words, ~2,688 tokens.
Download SKILL.mdSave it as
.claude/skills/image-optimization/SKILL.md (or your agent's skills folder).- name
- image-optimization
- description
- When the user wants to optimize images for search engines and performance. Also use when the user mentions "image SEO," "alt text," "image captions," "figcaption," "image optimization," "WebP," "lazy loading," "LCP," "image sitemap," "responsive images," "srcset," "image format," or "hero image optimization." For CWV, use core-web-vitals.
- metadata.version
- 1.2.1
SEO On-Page: Image Optimization
Guides image optimization for Google Search (text results, Image Pack, Google Images, Discover), Core Web Vitals (LCP), and accessibility. Consolidates image-related best practices from components (hero, trust-badges) and pages (landing-page). References: Google Image SEO, Semrush Image SEO.
When invoking: On first use, if helpful, open with 1–2 sentences on what this skill covers and why it matters, then provide the main output. On subsequent use or when the user asks to skip, go directly to the main output.
Scope
- Discovery & indexing: HTML img elements, image sitemap
- Format & performance: WebP, responsive images, lazy loading, LCP; full CWV optimization in core-web-vitals
- Metadata: Alt text, file names, captions
- Preferred image: primaryImageOfPage, og:image; thumbnail next to title/description in search results
- Structured data: ImageObject, image in Article/Product/etc.
Initial Assessment
Project context: Read root contextus.md when present and load only the modules relevant to this task. Without Contextus, use available project material or user-provided facts and ask for missing information; do not create a parallel context system.
Identify:
- Context: Hero, content page, product, trust badge, social preview
- Above vs below fold: LCP candidate (hero) vs lazy-loadable
- Image count: Single hero vs gallery, programmatic pages
1. Discovery & Indexing
Use HTML Image Elements
Google finds images in the src attribute of <img> (including inside <picture>). CSS background images are not indexed.
| Do | Don't |
|---|---|
<img src="puppy.jpg" alt="Golden retriever puppy" /> | <div style="background-image:url(puppy.jpg)"> |
Image Sitemap
Submit an image sitemap to help Google discover images it might otherwise miss. Image sitemaps can include URLs from CDNs (other domains); verify CDN domain in Search Console for crawl error reporting.
Structure (from Google):
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">
<url>
<loc>https://example.com/page</loc>
<image:image>
<image:loc>https://example.com/image.jpg</image:loc>
</image:image>
</url>
</urlset>See xml-sitemap for sitemap index and submission. Image sitemap is an extension; can be standalone or combined with page sitemap.
2. Format & Performance
Supported Formats
Google supports: BMP, GIF, JPEG, PNG, WebP, SVG, AVIF. Match filename extension to format.
| Format | Best for | Notes |
|---|---|---|
| WebP | Photos, graphics | Smaller files, faster load; lossy + lossless; transparency, animation |
| AVIF | Modern browsers | Even smaller than WebP; check support |
| JPEG | Standard photos | Fallback; widely supported |
| PNG | Transparency, detail | Larger; use when needed |
| SVG | Icons, logos | Scalable; use <title> for inline SVG alt |
| GIF | Simple animation | First frame only for preview |
Responsive Images
Use <picture> or srcset for different screen sizes. Always provide fallback src—some crawlers don't understand srcset.
<img
srcset="image-320w.jpg 320w, image-480w.jpg 480w, image-800w.jpg 800w"
sizes="(max-width: 320px) 280px, (max-width: 480px) 440px, 800px"
src="image-800w.jpg"
alt="Descriptive alt text">Picture element (format fallback, e.g. WebP → PNG):
<picture>
<source type="image/webp" srcset="image.webp">
<img src="image.png" alt="Descriptive alt text">
</picture>Data URI (Inline Images)
Base64 data URIs (data:image/...;base64,...) reduce HTTP requests but increase HTML size. Use sparingly for small icons; avoid for large images. See web.dev.
Resize & Compress
- Max width: Generally ≤2,500px; match container max-width
- Compression: WebP preferred; quality 75–85 for lossy; 72dpi for web
- LCP: Hero/above-fold images are LCP candidates; optimize aggressively
Lazy Loading
Use loading="lazy" only for below-fold images. Above-fold images (hero) must load immediately—lazy loading them hurts LCP.
<img src="hero.jpg" alt="..." loading="eager">
<img src="below-fold.jpg" alt="..." loading="lazy">3. Alt Text
Alt text improves accessibility (screen readers, low bandwidth) and SEO (Google uses it with computer vision to understand images). It also serves as anchor text if the image is a link.
Best Practices
| Do | Don't |
|---|---|
| Useful, information-rich description | Keyword stuffing |
| Context of page content | "image of" or "photo of" (redundant) |
| Max ~125 characters (some assistive tech truncates) | Empty alt on meaningful images |
| Descriptive for functional images | Alt on purely decorative images (use alt="") |
Examples (from Google):
- ❌ Missing:
<img src="puppy.jpg"/> - ❌ Stuffing:
alt="puppy dog baby dog pup pups puppies..." - ✅ Better:
alt="puppy" - ✅ Best:
alt="Dalmatian puppy playing fetch"
Captions
Google extracts image context from captions and nearby text. Use <figcaption> or descriptive text near the image.
| Use | Purpose |
|---|---|
| Topic relevance | Caption describes image subject; supports indexing |
| Featured Snippets | Images near answers with captions can capture thumbnail slots; see featured-snippet |
| Image Pack | Alt + caption + file name help Image Pack display; see serp-features |
Inline SVG
Use <title> inside SVG for accessibility:
<svg aria-labelledby="svgtitle1">
<title id="svgtitle1">Descriptive text for the SVG</title>
</svg>4. File Names
Descriptive filenames give Google light clues about subject matter.
| Do | Don't |
|---|---|
apple-iphone-15-pink-side-view.jpg | IMG00353.jpg |
| Short, hyphen-separated | Generic: image1.jpg, pic.gif |
| Localize filenames for translated pages | Overly long filenames |
Show full SKILL.md (410 more words)Show less
5. Preferred Image (SERP Thumbnail & Discover)
When users search for keywords, optimized images can appear as thumbnails next to the page title and description in search results—enhancing visibility and CTR. Google also uses these images for Google Discover. Search Engine Land
Google selects thumbnails automatically from multiple sources. Influence selection via:
Schema: primaryImageOfPage
{
"@context": "https://schema.org",
"@type": "WebPage",
"url": "https://example.com/page",
"primaryImageOfPage": "https://example.com/images/cat.png"
}Or attach image to main entity (e.g. BlogPosting, Article) via mainEntity or mainEntityOfPage.
Open Graph
<meta property="og:image" content="https://example.com/images/cat.png">Preferred image rules: Relevant, representative; avoid generic (e.g. logo) or text-heavy images; avoid extreme aspect ratios; high resolution. See open-graph, twitter-cards for social specs.
Google Discover (if targeting Discover): ≥1200px wide; ≥300KB; 16:9 aspect ratio preferred; important content visible in landscape crop.
6. Page Context
- Title & meta description: Google uses page title and meta for image result snippets. See title-tag, meta-description.
- Placement: Put images near relevant text; page subject matter influences image indexing.
- Same URL: Reference the same image with the same URL across pages for cache efficiency and crawl budget.
7. Structured Data
Add structured data for rich results in Google Images (badges, extra info). Image attribute is required for eligibility. See schema-markup for ImageObject, Article, Product, Recipe, etc.
8. Specs by Context
| Context | Priority | Notes |
|---|---|---|
| Hero | LCP, alt, no lazy | See hero-generator; above-fold, fast load |
| Article / Blog hero | 1200–1600px wide; proportional height; 1200×630 for og:image | Same image for Schema, Open Graph, Twitter Cards; under 200 KB; WebP preferred; descriptive alt; set width/height to prevent CLS; use srcset/sizes for responsive; articles with relevant images get ~94% more views |
| Trust badges | Alt text | See trust-badges-generator; e.g. "Norton Secured" |
| Landing page | All above | See landing-page-generator Pre-Delivery Checklist |
| OG / Twitter | 1200×630, 1200×675 | See open-graph, twitter-cards |
| Platforms | Per-platform | X, LinkedIn, Pinterest—see platform skills |
9. Opt-Out & SafeSearch
- Inline linking opt-out: Prevent full-sized image display in Google Images via HTTP referrer check (200 or 204). See Google docs.
- SafeSearch: Label pages for explicit content if applicable.
Output Format
- Alt text suggestions per image
- Captions (if applicable; snippet/Image Pack context)
- File name recommendations
- Format (WebP, fallback)
- Responsive (srcset/sizes or picture)
- Lazy loading (above-fold vs below-fold)
- Image sitemap (if many images)
- Preferred image (schema, og:image) for key pages
Related Skills
- core-web-vitals: LCP, INP, CLS; image optimization supports LCP
- xml-sitemap: Sitemap structure; image sitemap extension
- open-graph, twitter-cards: og:image, twitter:image; social preview
- schema-markup: ImageObject, Article/Product image
- content-optimization: Multimedia in content; defers image SEO to this skill
- featured-snippet: Images near answers + captions; snippet thumbnail
- serp-features: Image Pack; alt, captions, file names
- visual-content: Visual content for social, infographics; website images use this skill
© kostja94, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in skills/seo/on-page/image-optimization of kostja94/marketing-skills.
Open the folder on GitHubat commit 8dd89c5
Compare with similar skills
Image Optimization 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.
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|---|---|---|---|---|---|---|
| Image Optimization this skillkostja94/marketing-skills | 1k | — | ~2.7k | Automated safety check: Pass | MIT | |
| React Doctormakeplane/plane | 61k | 12 repos | ~657 | Automated safety check: Pass | AGPL-3.0 | |
| Fixing Motion Performanceibelick/ui-skills | 9.5k | 5 repos | ~1.4k | Automated safety check: Pass | MIT | |
| GSAP Performance Tuninggreensock/gsap-skills | 16k | 4 repos | ~1k | Automated safety check: Pass | MIT | |
| React Frontend Development Guidelinesdiet103/claude-code-infrastructure-showcase | 10k | 2 repos | ~2.9k | Automated safety check: Pass | MIT | |
| Web Quality Auditaddyosmani/web-quality-skills | 2.9k | — | ~2.6k | Automated safety check: Pass | MIT |
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Categories
Questions about Image Optimization
What does Image Optimization do?
When the user wants to optimize images for search engines and performance. Image Optimization is an agent skill from kostja94/marketing-skills. When the user wants to optimize images for search engines and performance.
When should I use Image Optimization?
Image Optimization fits situations like: wants to optimize images for search engines and performance; the user mentions image SEO; image optimization; responsive images.
How do I install Image Optimization in Claude Code?
Run `npx skills add kostja94/marketing-skills --skill image-optimization -a claude-code`. Or copy the skill folder (skills/seo/on-page/image-optimization in kostja94/marketing-skills) into .claude/skills/image-optimization in your project. Claude Code loads it when a task matches its description.
How do I install Image Optimization in Codex?
Run `npx skills add kostja94/marketing-skills --skill image-optimization -a codex`. Or copy the skill folder (skills/seo/on-page/image-optimization in kostja94/marketing-skills) into .agents/skills/image-optimization in your project. Codex loads it when a task matches its description.
Can I use Image Optimization 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 kostja94/marketing-skills --skill image-optimization -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-optimization, .gemini/skills/image-optimization, .github/skills/image-optimization and .opencode/skills/image-optimization in your project.
What does Image Optimization need to run?
SKILL.md names no scripts, command-line tools or credentials: Image Optimization is instructions for the agent only.
Does Image Optimization access the network?
SKILL.md names 7 domains. In commands or code: sitemaps.org, google.com and schema.org; the agent is likely to contact these when it follows the instructions. As links in the text: developers.google.com, semrush.com, web.dev and searchengineland.com. This is read from the text; nothing was executed.
Is Image Optimization 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 Optimization use?
Image Optimization 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 Optimization use?
About 2.7k tokens (SKILL.md is roughly 11k 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 Image Optimization?
Skills that share tags, products or a category with Image Optimization: React Doctor (makeplane/plane, 61k stars), Fixing Motion Performance (ibelick/ui-skills, 9.5k stars), GSAP Performance Tuning (greensock/gsap-skills, 16k stars) and React Frontend Development Guidelines (diet103/claude-code-infrastructure-showcase, 10k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Image Optimization?
kostja94 (a GitHub user) maintains it in kostja94/marketing-skills, which has 1,019 GitHub stars. The repository holds 102 skills in this directory. The repository was last updated on October 6, 2026.
Source: kostja94/marketing-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.