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/digital-marketing-pro:image-seo-audit · indranilbanerjee | DecimalAI

marketingby indranilbanerjee

/digital-marketing-pro:image-seo-audit

indranilbanerjee/image-seo-audit

Source indranilbanerjee/digital-marketing-pro ↗License MIT

Audit image SEO.

SkillScore77Maintained

Automatic

Marketing & Content pack

Last verified 8/17/2026

What it changes

Passed 17 of 22 test cases with the skill, and 12 of 22 without it.

Without skill55%

With skill77%

Checks it passed that the model alone missed

The summary table includes a metric row for Missing Alt Text.
The recommendations are prioritized by file size savings impact.
The summary table uses the column structure Metric | Status | Count.

and 4 more in the full report

5 fixed12 passed either way5 still failing0 broke

Pass-rate lift: +23 pp
Tokens: +46%
Agent turns: 0%
Response time: -3%

Model gemini-3.6-flashMeasured 8/17/2026v117 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/indranilbanerjee-image-seo-audit/SKILL.md https://app.decimal.ai/s/indranilbanerjee-image-seo-audit/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add indranilbanerjee-image-seo-audit, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/indranilbanerjee-image-seo-audit/ and pins it in .decimal/skills.lock

decimalai skills add indranilbanerjee-image-seo-audit

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/indranilbanerjee-image-seo-audit/SKILL.md https://app.decimal.ai/s/indranilbanerjee-image-seo-audit/SKILL.md

Raw file: /s/indranilbanerjee-image-seo-audit/SKILL.md ↗ · machine-readable summary at /s/indranilbanerjee-image-seo-audit.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 5 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 5

Prompt

We are updating image formats on https://example.com/gallery. Our team wants to transition to JPEG XL since Chromium announced support for it in late 2025. Is JPEG XL ready for production recommendation across web images, or what format pattern should we use?

What was checked, without and with the skill
Checked	Without skill	With skill
The response recommends WebP or AVIF rather than JPEG XL for production.	Missed	Passed
The response mentions that JPEG XL is not yet supported in Chrome stable.	Passed	Passed

case-04 · gemini-3.6-flash · 8/17/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md83 linessingle file

/digital-marketing-pro:image-seo-audit

Purpose

Perform a dedicated image optimization audit that evaluates all images on a page or site for SEO, performance, and accessibility. Produces a prioritized optimization list sorted by file size impact.

Input Required

URL: Page or site to audit
Scope: Single page or site-wide crawl (default: single page)

Process

Load brand context: Read active brand profile for industry context.
Discover images: Find all <img>, <picture>, CSS background-image, and <source> elements.
Alt text audit: Check presence, quality, keyword inclusion, length (10-125 chars). Flag: missing, filename-only ("image.jpg"), keyword-stuffed, non-descriptive ("click here").
File size audit: Apply tiered thresholds by image category — thumbnails (<50KB target, >200KB critical), content images (<100KB target, >500KB critical), hero/banner (<200KB target, >700KB critical).
Format audit: Check for modern formats. Recommend WebP (97%+ support) or AVIF (92%+ support) over JPEG/PNG. Check for <picture> element with format fallbacks. Note: JPEG XL restored in Chromium (Nov 2025) but not yet in Chrome stable — monitor, don't recommend yet.
Responsive images: Check for srcset and sizes attributes, appropriate resolution for device pixel ratios.
Lazy loading: Verify loading="lazy" on below-fold images. Flag loading="lazy" on above-fold/hero images (directly harms LCP).
fetchpriority: Check for fetchpriority="high" on LCP/hero images. Check for decoding="async" on non-LCP images.
CLS prevention: Check for width and height attributes or aspect-ratio CSS on all <img> elements. Flag images without dimensions.
File naming: Check for descriptive, hyphenated, lowercase file names vs generic names (IMG_1234.jpg).
CDN usage: Check if images are served from a CDN (different domain, CDN headers, edge caching).
Score and prioritize: Sort by file size savings impact (largest first).

Recommended Picture Element Pattern

<picture>
  <source srcset="image.avif" type="image/avif">
  <source srcset="image.webp" type="image/webp">
  <img src="image.jpg" alt="Descriptive alt text" width="800" height="600" loading="lazy" decoding="async">
</picture>

Hero/LCP Image Pattern

<img src="hero.webp" fetchpriority="high" alt="Hero image description" width="1200" height="630">

Track record

Benchmark

17 / 22

test cases passed, vs 12 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

indranilbanerjee / digital-marketing-pro

skills/image-seo-audit/SKILL.md

View on GitHub ↗

License MITImported 10/17/2026Version v1

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Published skills whose descriptions closely match this one, with their headline benchmark lift.

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

/digital-marketing-pro:image-seo-audit

Purpose

Input Required

Process

Recommended Picture Element Pattern

Hero/LCP Image Pattern

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

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