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 guia-matthieu/clawfu-skills --skill email-writinggit clone --depth 1 https://github.com/guia-matthieu/clawfu-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/guia-matthieu/clawfu-skills/email-writing)<a href="https://agentmods.dev/skills/guia-matthieu/clawfu-skills/email-writing"><img src="https://agentmods.dev/badge/skills/guia-matthieu/clawfu-skills/email-writing/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/guia-matthieu/clawfu-skills/email-writing"><img src="https://agentmods.dev/badge/skills/guia-matthieu/clawfu-skills/email-writing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
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 | $0.00068 | $0.04491 |
| Opus 5 | $0.00034 | $0.02246 |
| Sonnet 5 | $0.00014 | $0.00898 |
| Haiku 4.5 | $0.00007 | $0.00449 |
Grade A, and why
email-writing 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 13d 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 — 810 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Email Writing
Master email marketing from subject lines to sequences. Templates for welcome emails, nurture campaigns, sales emails, and newsletters that get opened, read, and clicked.
When to Use This Skill
- Writing email subject lines that get opens
- Creating welcome email sequences
- Building nurture and sales sequences
- Writing newsletters that engage
- Re-engagement and win-back campaigns
- Reviewing and improving email performance
Methodology Foundation
Source: Compiled from Copyhackers, Really Good Emails, Val Geisler, Joanna Wiebe, and direct response email best practices.
Core Principle: Email is a conversation, not a broadcast. Every email should feel like it came from a person, provide value, and respect the inbox.
Why This Matters: Email still delivers the highest ROI of any channel ($36 for every $1 spent). But only if it gets opened, read, and clicked.
What Claude Does vs What You Decide
| Claude Does | You Decide |
|---|---|
| Structures production workflow | Final creative direction |
| Suggests technical approaches | Equipment and tool choices |
| Creates templates and checklists | Quality standards |
| Identifies best practices | Brand/voice decisions |
| Generates script outlines | Final script approval |
What This Skill Does
- Writes subject lines that get opens - Curiosity, value, or urgency
- Crafts email body copy - Engaging, scannable, action-oriented
- Builds email sequences - Welcome, nurture, sales, launch
- Creates newsletter formats - Consistent, valuable, efficient
- Optimizes send strategy - Timing, frequency, segmentation
How to Use
Write Subject Lines
Write 10 subject lines for:
Email type: [welcome, newsletter, sales, etc.]
Content/offer: [what the email is about]
Audience: [who receives it]
Write a Complete Email
Write a [type] email for:
Product/service: [description]
Goal: [click, reply, buy, etc.]
Recipient context: [new subscriber, past customer, etc.]
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.
- 13d ago First seen · 810 lines · 68 tokens per session scan A 94b41b3bd973
email-writing is a skill published in the GitHub repository guia-matthieu/clawfu-skills (149 stars, last pushed 5mo ago), licensed MIT. It adds 68 tokens to every session and 4,491 once invoked, about $0.0003 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 2026-08-30.
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