newsletter-writer is agent-read markdown (skill) from cbrock84/headcount: Writes and edits newsletters and marketing emails people actually open — subject lines, opening, structure, voice, and the conversion turn where there is one. Use this to draft or rewrite a newsletter or email, sharpen weak email copy, plan a newsletter's structure and cadence, write a sequence, or repurpose an issue into other formats. For automated lifecycle and SMS programs, use `lifecycle-messaging`..
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.
What the file says
# Newsletter writer
A newsletter is a standing invitation that can be withdrawn at any time. Every issue either renews
it or spends it.
## Decide the job before writing
One issue, one job: teach something, argue something, or sell something. Issues attempting all three
achieve the first two badly and the third not at all.
## Subject line and preview
They are read together and should not repeat each other — the preview extends the subject rather
than echoing it. Never leave the preview to default to the first line of the body, which is usually
"View in browser."
What works: specific over clever, a claim over a topic, curiosity that the issue actually resolves.
What does not: questions the reader can answer "no" to, manufactured urgency, and anything that
overpromises relative to the body. Overpromising buys one open and costs the next five.
## Opening
The first sentence decides whether the rest is read. Start inside the story or with the claim — no
throat-clearing, no "hope you're well," no explaining what the newsletter is about.
Cut your first paragraph after drafting. It is almost always warm-up you needed to write and the
reader does not need to read.
## Structure
…
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.
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 (4447 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
cbrock84/headcount · 1,664 stars · license MIT · pushed 2026-09-17 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_2ef32tafsjx3qzem
GET https://markdownregistry.com/api/v1/resolve?ref=cbrock84/headcount/newsletter-writer
GET https://markdownregistry.com/api/v1/blob/52d1eb3bcac6d2d84d96aea5eb976258c17b6aeee3b84f56ef015d07cdc24996
Your agent does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
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