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email-copywriting

email-copywriting is a skill for Claude Code from brainbytes-dev/everything-claude-marketing. It costs 31 tokens per session (3,185 once invoked), scanned A, original, MIT.

A guide to writing marketing emails, including subject lines, preview text, message content, and calls to action.

In plain words
What is it for?
Use it to write promotional, educational, transactional, welcome, sales, and nurture emails, as well as email-copy experiments.
Why use it?
It helps each email focus on one intended response and makes the message easier to notice, scan, and act on.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the everything-claude-marketing plugin — 72 skills, 22 commands, 18 agents, 2 hooks shipped together

not rated 10repo +1 7mo ago A scan 31 tokens original MIT

Good fit Use it to write promotional, educational, transactional, welcome, sales, and nurture emails, as well as email-copy experiments.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/brainbytes-dev/everything-claude-marketing/email-copywriting
View source ↗ brainbytes-dev/everything-claude-marketing
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add brainbytes-dev/everything-claude-marketing --skill email-copywriting
Clone the repo
git clone --depth 1 https://github.com/brainbytes-dev/everything-claude-marketing

Made for: Claude Code.

Or install everything-claude-marketing, the plugin that ships this one along with the rest of its 72 skills, 22 commands, 18 agents, 2 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for email-copywriting

README.md
[![agentmods](https://agentmods.dev/badge/skills/brainbytes-dev/everything-claude-marketing/email-copywriting/github.svg)](https://agentmods.dev/skills/brainbytes-dev/everything-claude-marketing/email-copywriting)
Your own site
<a href="https://agentmods.dev/skills/brainbytes-dev/everything-claude-marketing/email-copywriting"><img src="https://agentmods.dev/badge/skills/brainbytes-dev/everything-claude-marketing/email-copywriting/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for email-copywriting

Your own site · 80×15
<a href="https://agentmods.dev/skills/brainbytes-dev/everything-claude-marketing/email-copywriting"><img src="https://agentmods.dev/badge/skills/brainbytes-dev/everything-claude-marketing/email-copywriting.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,185 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00031 $0.03185
Opus 5.5 $0.00012 $0.01274
Sonnet 5.5 $0.00006 $0.00637
Haiku 4.5 $0.00003 $0.00318

Measured 2mo ago against content hash 03b934b6c908, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

email-copywriting scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/email/email-copywriting/SKILL.md · 309 lines

How it starts

The opening of the file, as written. The whole thing — 309 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Email Copywriting

When to Activate

Use this skill when:

  • Writing subject lines for email campaigns
  • Drafting email body copy (promotional, educational, transactional)
  • Optimizing CTAs and button copy
  • Writing email sequences (welcome, sales, nurture)
  • A/B testing email copy elements
  • Reviewing and improving existing email copy
  • Writing preview text and preheader copy

First Questions

Before writing email copy, clarify:

  1. What is the email's ONE goal? (Click, reply, purchase, register, read)
  2. Who is the recipient? (Segment, relationship stage, pain points)
  3. What action should the reader take after reading?
  4. What is the offer or value proposition?
  5. Is this a standalone campaign or part of a sequence? (Context from previous emails?)
  6. What tone/voice does the brand use? (Formal, conversational, edgy, warm)
  7. Is this plain text, HTML, or hybrid?

Core Rules

  1. One email, one goal. If the email has two CTAs pointing to different actions, pick one and remove the other.
  2. Subject line > body copy > CTA. If the subject line fails, nothing else matters because no one reads the email.
  3. Write for scanners. Most people scan emails in 3-8 seconds. Structure for scanning with headers, bold text, short paragraphs, and bullet points.
  4. Write like a human, not a brand. Emails that feel like letters from a person outperform corporate announcements.
  5. Every sentence must earn the next sentence. If a line doesn't add value, cut it.
  6. Mobile first. 60%+ of email opens are on mobile. Short subject lines, short paragraphs, large tappable buttons.
  7. The CTA must be unmissable. One primary CTA, above the fold, clear and action-oriented.

Subject Line Formulas

Curiosity-Driven

  1. "The [thing] that [unexpected result]"
  2. "Why [common practice] doesn't work anymore"
  3. "I was wrong about [topic]"
  4. "[First name], you're not going to believe this"
  5. "The secret behind [impressive result]"

Benefit-Driven

  1. "How to [achieve result] in [timeframe]"
  2. "[Number] ways to [solve problem] (without [common objection])"
  3. "The fastest way to [desired outcome]"
  4. "Get [specific result] — here's how"
  5. "Your [problem] ends today"

Read the full file on GitHub · 309 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 309 lines · 31 tokens per session scan A 03b934b6c908

Subscribe to this mod's changes

email-copywriting is a skill published in the GitHub repository brainbytes-dev/everything-claude-marketing (10 stars, last pushed 7mo ago), licensed MIT. It adds 31 tokens to every session and 3,185 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

Marketing and SEOWriting and docs
Related

email-copywriting compared with skills from other repositories

email-copywriting next to 6 skills from other repositories
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email-copywritingbrainbytes-dev/everything-claude-marketingSkill107mo agoMITA31Claude Code
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