What is ck:copywriting?

A copywriting toolkit for writing headlines, emails, landing pages, calls to action, and other promotional text. It includes reusable writing formulas, templates, patterns, and style references.

Use it to draft headlines and subject lines, create email campaigns and landing pages, improve calls to action, write social posts or product descriptions, and produce alternative versions for comparison.

It helps turn a blank page into structured copy and keeps messages consistent with a chosen writing style.

ck:copywriting — Skill for Claude Code by bestagentkits

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 bestagentkits/ck-skills --skill copywriting

Clone the repo

git clone --depth 1 https://github.com/bestagentkits/ck-skills

Made for: Claude Code.

Or install ck-skills, the plugin that ships this one along with the rest of its 14 skills.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/bestagentkits/ck-skills/copywriting/github.svg)](https://agentmods.dev/skills/bestagentkits/ck-skills/copywriting)

Your own site

<a href="https://agentmods.dev/skills/bestagentkits/ck-skills/copywriting"><img src="https://agentmods.dev/badge/skills/bestagentkits/ck-skills/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/bestagentkits/ck-skills/copywriting"><img src="https://agentmods.dev/badge/skills/bestagentkits/ck-skills/copywriting.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 60 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 949 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 91% copy Near-identical to another mod 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.

Model	Per session	Once invoked
Fable 5.1	$0.00060	$0.00949
Opus 5	$0.00030	$0.00475
Sonnet 5	$0.00012	$0.00190
Haiku 4.5	$0.00006	$0.00095

Measured 10d ago against content hash edbe706cb9be, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

ck: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 10d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/extract-writing-styles.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Origin

This is a copy

91% identical to ck:copywriting — 14 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

plugins/ck-skills/skills/copywriting/SKILL.md · 101 lines

How it starts

The opening of the file, as written. The whole thing — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Copywriting

Formulas, templates, patterns, and writing styles for high-converting copy.

When to Use

Writing headlines/subject lines, landing page copy, email campaigns
Social posts, product descriptions, CTA optimization, A/B variations
Applying custom writing styles from user documents

Writing Styles

Load: references/*.md | Default catalog: assets/writing-styles/default.md (50 styles)

Extract styles from multi-format files:

python .claude/skills/copywriting/scripts/extract-writing-styles.py --list        # List files
python .claude/skills/copywriting/scripts/extract-writing-styles.py --style <name> # Extract style

Formats: .md .txt .pdf .docx .xlsx .pptx .jpg .png .mp4 (docs/media need GEMINI_API_KEY)

Copy Formulas

Load: references/copy-formulas.md

Formula	Structure	Best For
AIDA	Attention → Interest → Desire → Action	Landing pages, ads
PAS	Problem → Agitate → Solution	Email, sales pages
BAB	Before → After → Bridge	Testimonials, case studies
4Ps	Promise → Picture → Proof → Push	Long-form sales
4Us	Urgent + Unique + Useful + Ultra-specific	Headlines
FAB	Feature → Advantage → Benefit	Product descriptions

Headlines

Load: references/headline-templates.md

Patterns: "How to [X] without [Y]" • "[Number] ways to [benefit]" • "The secret to [outcome]" • "Why [belief] is wrong"

Email Copy

Load: references/email-copy.md

Subject lines: Curiosity gap • Benefit-driven • Question • Urgency

Landing Pages & CTAs

Load: references/landing-page-copy.md | references/cta-patterns.md

Hero: Headline (promise) → Subheadline (how) → CTA (action) → Social proof CTAs: "Start [verb]ing" • "Get [benefit]" • "Yes, I want [benefit]"

Workflows

Workflow	Purpose	Use When
`references/workflow-cro.md`	CRO optimization (25 principles) + plan creation workflow	Conversion optimization & CRO plan requests
`references/workflow-enhance.md`	Copy enhancement	Improving existing copy
`references/workflow-fast.md`	Quick copy generation	Simple, time-sensitive requests
`references/workflow-good.md`	Quality copy with research	High-stakes content

Read the full file on GitHub · 101 lines

Files

What ships with it

14 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

10d ago First seen · 101 lines · 60 tokens per session scan A edbe706cb9be

Subscribe to this mod's changes

ck:copywriting is a skill published in the GitHub repository bestagentkits/ck-skills (6 stars, last pushed 3mo ago), licensed MIT. It adds 60 tokens to every session and 949 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 91% identical to ck:copywriting, differing in 14 lines, and is treated as a copy.

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