Library / Marketing

Email Sequence Writer Claude skill

Writes welcome, abandoned cart, or launch sequences with subject lines, timing, and one CTA per email.

Who it's for: Ecom brands and newsletter operators on Klaviyo, Beehiiv, or Mailchimp.
Last tested: 2026-10-22. License: MIT.

SKILL.md

---
name: email-sequence-writer
description: Write a multi-email marketing sequence. Use when the user asks for a welcome series, nurture flow, launch sequence, or drip campaign.
---

# Email Sequence Writer

## Inputs
Sequence goal, audience, brand voice sample, offer, number of emails (default 5).

## Steps
1. Map the sequence: email number, send delay, job of the email (welcome, story, proof, objection, offer).
2. For each email write: 3 subject line options (under 45 chars), preview text (under 90 chars), body (under 200 words), one CTA.
3. Keep one idea per email. Plain text style unless asked for designed.
4. End with a short note on segmentation and what to A/B test first.

## Output
Markdown with one section per email, then the testing note.

How to install

Claude.ai (web and desktop)

1. Make a folder named email-sequence-writer and save the file above inside it as SKILL.md.
2. Zip the folder.
3. Go to Settings, then Capabilities (or Customize, Skills, depending on your app version), and upload the zip. Code execution must be on.

Claude Code

mkdir -p ~/.claude/skills/email-sequence-writer
# paste the SKILL.md into:
~/.claude/skills/email-sequence-writer/SKILL.md
# or per project: .claude/skills/email-sequence-writer/SKILL.md

Claude API

Upload the folder to the Skills API, then pass the returned skill ID in the container of a Messages request with the code execution tool on.

curl -X POST https://api.anthropic.com/v1/skills \
  -H "x-api-key: $ANTHROPIC_API_KEY" -H "anthropic-version: 2023-06-01" \
  -F "files[]=@email-sequence-writer/SKILL.md;filename=email-sequence-writer/SKILL.md"

# then in /v1/messages:
"container": { "skills": [{ "type": "custom", "skill_id": "skill_...", "version": "latest" }] },
"tools": [{ "type": "code_execution_20250825", "name": "code_execution" }]

Checked against Anthropic's Skills API guide on 2026-10-22: platform.claude.com/docs/en/build-with-claude/skills-guide

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