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CosmoBlk/email-marketing-bible

A markdown skill for Claude Code and other AI agents that supplies email marketing playbooks, copy rules, deliverability triage and send-safety gates.

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What is it?

Email Marketing Bible is a free, MIT-licensed agent skill that turns an AI assistant into an email marketing consultant. Its core file, SKILL.md, holds the rules and gates, and a set of reference files covers deeper topics such as deliverability, compliance, flows, copy, design, segmentation, cold email and messaging channels.

The skill targets common marketing work: auditing an existing ESP setup, building welcome, cart, post-purchase and win-back flows from a prompt, drafting and editing copy, directing email design, and triaging spam or inbox placement problems. It also covers operating an ESP through MCP or an API, with a rule that nothing is sent to a list without explicit approval.

It can be installed as a Claude Code plugin, through the npx skills CLI for agents such as Codex and Cursor, or by pasting the raw SKILL.md into a chat tool. Chapters also include industry playbooks for 19 verticals, a platform comparison, benchmarks and compliance notes for regions including the EU, UK, US and Australia.

Key features

  • 01Builds automation flows such as welcome, cart and win-back from a prompt
  • 02Audits account setup, segments and deliverability configuration
  • 03Provides copywriting frameworks and rules for removing AI-sounding phrasing
  • 04Explains SPF, DKIM, DMARC and Gmail sender requirements with triage steps
  • 05Requires explicit approval before any campaign is sent
  • 06Includes compliance notes for GDPR, CAN-SPAM, CASL and other regimes

Use cases

  • Auditing an existing Klaviyo or other ESP account before adding new flows
  • Diagnosing a sudden drop in inbox placement or opens
  • Drafting and editing welcome or promotional emails for a brand voice
  • Giving an AI coding or marketing agent email domain knowledge before it touches a live list

Quick start

  1. 1

    In Claude Code, add the marketplace

    /plugin marketplace add CosmoBlk/email-marketing-bible
  2. 2

    Install the plugin (install only one of the plugin or a manual clone)

    /plugin install email-marketing-bible@email-marketing-bible

Things to know

  • The plugin route needs a recent version of Claude Code.
  • Installing both the plugin and a manual clone can load the skill twice.
  • The author co-founded Nitrosend, one of the platforms compared in the guide.

Topics

#email-marketing#agent-skills#claude-code#deliverability#copywriting#marketing-automation#ecommerce#ai-skill#saas

FAQ

What is email-marketing-bible?
A markdown skill for Claude Code and other AI agents that supplies email marketing playbooks, copy rules, deliverability triage and send-safety gates. Email Marketing Bible is a free, MIT-licensed agent skill that turns an AI assistant into an email marketing consultant. Its core file, SKILL.md, holds the rules and gates, and a set of reference files covers deeper topics such as deliverability, compliance, flows, copy, design, segmentation, cold email and messaging channels.
Is email-marketing-bible free to use? What license does it have?
email-marketing-bible is open source under the MIT license. Check the license terms before using it in commercial products.
Is email-marketing-bible still maintained?
Actively maintained. The last commit to email-marketing-bible was on Oct 13, 2026.
What can I use email-marketing-bible for?
Auditing an existing Klaviyo or other ESP account before adding new flows Diagnosing a sudden drop in inbox placement or opens Drafting and editing welcome or promotional emails for a brand voice Giving an AI coding or marketing agent email domain knowledge before it touches a live list
How do I install email-marketing-bible?
In Claude Code, add the marketplace: /plugin marketplace add CosmoBlk/email-marketing-bible Install the plugin (install only one of the plugin or a manual clone): /plugin install email-marketing-bible@email-marketing-bible
Where can I get email-marketing-bible?
The source code and installation instructions are on GitHub: https://github.com/CosmoBlk/email-marketing-bible

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