cognyai/claude-code-marketing-skills · skills/subject-line-lab/SKILL.md

subject-line-lab skillA

subject-line-lab is agent-read markdown (skill) from cognyai/claude-code-marketing-skills: Mine your actual subject-line history from Klaviyo / Mailchimp / Rule / Get a Newsletter, find the patterns that work for YOUR list, and generate tuned candidates.

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 cognyai/claude-code-marketing-skills/subject-line-lab@v1.0.0
Exact content
mdr add cognyai/claude-code-marketing-skills/subject-line-lab@sha256:d6ff778c5d057699

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_en6bf42l3orxgx5t.svg)](https://markdownregistry.com/a/art_en6bf42l3orxgx5t)

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Versions

versioncommittedcommitsizeaudit
v1.0.0 latest2026-04-22 77a7b2e 8,054 BA view · diff
v1.0.02026-04-22 195609e 6,967 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 (8054 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

cognyai/claude-code-marketing-skills · 102 stars · license none · pushed 2026-06-16 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_en6bf42l3orxgx5t
GET https://markdownregistry.com/api/v1/resolve?ref=cognyai/claude-code-marketing-skills/subject-line-lab
GET https://markdownregistry.com/api/v1/blob/d6ff778c5d057699039cfdc685edd76abb6f36fbab35e5173e214b59d7e2ce13

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