kostja94/marketing-skills · skills/seo/on-page/image-optimization/SKILL.md

image-optimization skillA

image-optimization is agent-read markdown (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..

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add kostja94/marketing-skills/image-optimization@v1.2.1
Exact content
mdr add kostja94/marketing-skills/image-optimization@sha256:4a410b72a2f27e16

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_zvh4e5phfdfznai7.svg)](https://markdownregistry.com/a/art_zvh4e5phfdfznai7)

0 badge views in 30 days

Versions

versioncommittedcommitsizeaudit
v1.2.1 latest2026-03-27 f1ec9f7 10,674 BA view · diff
v1.2.02026-03-11 c7d87bd 10,644 BA view · diff
v1.1.02026-03-11 5cca54d 10,335 BA view · diff
v1.1.02026-03-11 9abc679 10,365 BA view · diff
v1.0.02026-03-05 de48938 9,178 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (10674 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

kostja94/marketing-skills · 976 stars · license MIT · pushed 2026-06-09 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_zvh4e5phfdfznai7
GET https://markdownregistry.com/api/v1/resolve?ref=kostja94/marketing-skills/image-optimization
GET https://markdownregistry.com/api/v1/blob/4a410b72a2f27e16acf5e2313f1f89e6ff10ff44bf7e146d138007c98b7ae2b6

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.