kostja94/marketing-skills · skills/pages/utility/404/SKILL.md

404-page-generator skillA

404-page-generator is agent-read markdown (skill) from kostja94/marketing-skills: When the user wants to create, optimize, or audit 404 error pages. Also use when the user mentions "404 page," "404 error," "error page," "page not found," "broken link page," "404 design," "custom 404," "404 redirect," "404 page UX," or "404 recovery." For sitewide page planning, use website-structure..

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/404-page-generator@v1.0.1
Exact content
mdr add kostja94/marketing-skills/404-page-generator@sha256:cde007e2e506a87e

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_cdg5rmeewx3p32yq.svg)](https://markdownregistry.com/a/art_cdg5rmeewx3p32yq)

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Versions

versioncommittedcommitsizeaudit
v1.0.1 latest2026-03-27 f1ec9f7 2,865 BA view · diff
v1.0.02026-03-11 5cca54d 2,814 BA view · diff
v1.0.02026-02-28 b615388 2,844 BA view · diff
v1.0.02026-02-28 f71005e 2,756 BA view · diff
v1.0.02026-02-28 28ba327 2,777 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 (2865 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_cdg5rmeewx3p32yq
GET https://markdownregistry.com/api/v1/resolve?ref=kostja94/marketing-skills/404-page-generator
GET https://markdownregistry.com/api/v1/blob/cde007e2e506a87ed817565e6e64e701d45330a32c503beac1e4035250da7aed

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