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.
npx skills add sendx/email-skills --skill email-copywritinggit clone --depth 1 https://github.com/sendx/email-skillsWrote 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.
[](https://agentmods.dev/skills/sendx/email-skills/email-copywriting)<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.
<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>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.
| Model | Per session | Once 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 |
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.
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).
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.
- 9d ago First seen · 172 lines · 23 tokens per session scan A 36d24b58ec18
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.
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