email-copywriting

email-copywriting is a skill for Claude Code, Codex from sendx/email-skills. It costs 23 tokens per session (3,376 once invoked), scanned A, original, MIT.

A writing guide for email subject lines, preview text, message bodies, and calls to action. It adapts the advice to details such as the audience, brand voice, industry, and campaign type.

In plain words
What is it for?
Use it to write welcome emails, promotional messages, re-engagement campaigns, drip sequences, and personalized email copy.
Why use it?
It helps when an email is difficult to start or when the message needs to earn attention, hold interest, and prompt a click.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: positional $N argument.

Good fit Use it to write welcome emails, promotional messages, re-engagement campaigns, drip sequences, and personalized email copy.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/sendx/email-skills/email-copywriting
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 sendx/email-skills --skill email-copywriting
Clone the repo
git clone --depth 1 https://github.com/sendx/email-skills

Made for: Claude Code, Codex.

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/sendx/email-skills/email-copywriting/github.svg)](https://agentmods.dev/skills/sendx/email-skills/email-copywriting)
Your own site
<a href="https://agentmods.dev/skills/sendx/email-skills/email-copywriting"><img src="https://agentmods.dev/badge/skills/sendx/email-skills/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/sendx/email-skills/email-copywriting"><img src="https://agentmods.dev/badge/skills/sendx/email-skills/email-copywriting.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 23 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,376 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 $0.00023 $0.03376
Opus 5 $0.00012 $0.01688
Sonnet 5 $0.00005 $0.00675
Haiku 4.5 $0.00002 $0.00338

Measured 9d ago against content hash 36d24b58ec18, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, 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 9d 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-copywriting/SKILL.md · 172 lines

How it starts

The opening of the file, as written. The whole thing — 172 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Writing High-Converting Email Copy

Your Setup — Fill These In for Better Results

This skill gives generic advice by default. Fill in your details below and it will match tone, examples, and copy frameworks to your brand and audience.

  • Industry: [e.g., ecommerce, SaaS, B2B services]
  • Brand voice: [e.g., casual and friendly, professional, witty, authoritative]
  • Audience: [e.g., small business owners, developers, consumers aged 25-45]
  • Campaign type: [e.g., welcome sequence, promotional broadcast, re-engagement]

What you do

You teach email marketers how to write copy that actually works: subject lines that get opened, preview text that sets expectations, body copy that holds attention, and CTAs that get clicked. You tie copy strategy to SendX's tools so they can execute immediately.

When to activate

  • A marketer's stuck writing an email and doesn't know where to start
  • They're asking "How do I write a subject line that doesn't get ignored?"
  • They want to personalize emails but aren't sure how to do it well
  • They're writing for a specific campaign type (drip sequence vs. one-off broadcast) and need tone guidance
  • They're trying to re-engage inactive subscribers
  • They want to understand why some email copy converts and other copy doesn't

Your expertise

You know how to write for email (not blog posts, not ads, not websites—email). You know SendX's tools and can reference them practically:

Subject Line Formula That Works Most subject lines fail because they're generic or sell too hard. Two rules, in order:

Rule 1: Six words or fewer. In an analysis of 1,200+ campaigns and 8M+ sends across multiple markets, every top-open-rate email had a subject line of 6 words or fewer. No exceptions. Long subject lines get buried in the inbox. Short ones create a curiosity gap that forces the open. Trim every word that isn't pulling weight.

Rule 2: Within those 6 words, use the framework Specific Benefit + Curiosity + Urgency (optional).

Read the full file on GitHub · 172 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. 9d ago First seen · 172 lines · 23 tokens per session scan A 36d24b58ec18

Subscribe to this mod's changes

email-copywriting is a skill published in the GitHub repository sendx/email-skills (8 stars, last pushed 1mo ago), licensed MIT. It adds 23 tokens to every session and 3,376 once invoked, about $0.0001 per session on Opus 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 2026-08-31.

Related

Other skills, from other repositories

email-marketing-bible

Data-backed email marketing skill for AI agents. Use when building or running email automation, driving an ESP from an agent (MCP/connectors), diagnosing deliverability, writing or de-slopping email copy, directing AI email design, choosing a platform, or pulling benchmarks. Covers flows, segmentation, compliance…

CosmoBlk/email-marketing-bible · 85 tokens

catalyst-center-readonly

Query Cisco Catalyst Center read-only — device inventory, site hierarchy, wireless, assurance health, compliance, software images, events. All 514 read-only API operations reachable through 8 grouped dispatchers. Use when asked what Catalyst Center manages, where a device sits, what its health or compliance state is…

automateyournetwork/netclaw · 78 tokens

playwright-best-practices

Use when writing Playwright tests, fixing flaky tests, debugging failures, implementing Page Object Model, configuring CI/CD, optimizing performance, mocking APIs, handling authentication or OAuth, testing accessibility (axe-core), file uploads/downloads, date/time mocking, WebSockets, geolocation, permissions…

currents-dev/playwright-best-practices-skill · 214 tokens

huawei-cloud-ucs-policy-governor

Huawei Cloud UCS (Ubiquitous Cloud Native Service) policy governance and compliance management skill using hcloud CLI. Use this skill when the user wants to: (1) manage UCS policy instances - create/update/query/delete, (2) manage UCS policy definitions - query/list, (3) enable/disable policies on clusters or fleet…

huaweicloud/huaweicloud-skills · 215 tokens

cis-aws-compute-2.14

Ensure EC2 Auto Scaling Groups Propagate Tags to EC2 Instances that it launches.

CyberStrikeus/CyberStrike · 26 tokens

ebpf-observability

Use eBPF for deep kernel-level observability — trace syscalls, network flows, and application behavior without code changes using Cilium, Tetragon, and bpftrace.

BagelHole/DevOps-Security-Agent-Skills · 43 tokens