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 agentmods add skills/nickcrew/claude-cortex/copywriternpx skills add NickCrew/Claude-Cortex --skill copywritergit clone --depth 1 https://github.com/NickCrew/Claude-CortexWrote 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/nickcrew/claude-cortex/copywriter)<a href="https://agentmods.dev/skills/nickcrew/claude-cortex/copywriter"><img src="https://agentmods.dev/badge/skills/nickcrew/claude-cortex/copywriter.svg" alt="Measured on agentmods" 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 | $0.00073 | $0.02397 |
| Opus 5 | $0.00036 | $0.01198 |
| Sonnet 5 | $0.00015 | $0.00479 |
| Haiku 4.5 | $0.00007 | $0.00240 |
Grade A, and why
copywriter 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 3d 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 — 236 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Copywriter
Overview
This skill produces high-converting marketing copy using proven frameworks like AIDA (Attention, Interest, Desire, Action), PAS (Problem, Agitate, Solution), and benefit-led writing. It distinguishes features from benefits, uses power words strategically, and places calls to action where they convert. Whether you need punchy hero copy for a SaaS landing page, a product description that sells on Amazon, or two variations to A/B test, this skill delivers persuasive copy that moves readers toward a decision.
When to Use
- Landing page hero sections, subheadlines, and CTAs
- Product descriptions for e-commerce or app stores
- Digital ad copy (Google, Meta, LinkedIn)
- Sales emails and promotional sequences
- Taglines and brand positioning statements
- Pricing page copy
- Webinar or event registration pages
When NOT to Use
- Long-form editorial or thought-leadership articles (use
blog-postskill) - Technical documentation or product guides (use
technical-writerskill) - Journalistic or news content
- Academic writing (use
academic-essayskill)
Quick Reference
| Task | Approach |
|---|---|
| Hero headline | Lead with the transformation/outcome, not the product |
| Features vs benefits | Feature: "256-bit encryption"; Benefit: "Your data stays private, always" |
| AIDA | Attention → Interest → Desire → Action |
| PAS | Problem → Agitate → Solution |
| Power words | Free, proven, guaranteed, instantly, effortless, exclusive, limited |
| CTA | Verb + specific outcome: "Start saving time" not "Submit" |
| Social proof | Specific numbers beat vague claims: "4,200 teams" not "thousands" |
| A/B testing | Change one element at a time: headline OR CTA, not both |
Instructions
-
Identify the ONE conversion goal. Every piece of copy has one job: get a click, start a trial, complete a purchase, fill a form. Determine this before writing a word.
-
Define the target reader. Who are they? What do they desperately want? What pain are they trying to escape? What objections will they have? Copy that speaks to everyone persuades no one.
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.
- 3d ago First seen · 236 lines · 73 tokens per session scan A 4ebe4785b3cf
copywriter is a skill published in the GitHub repository NickCrew/Claude-Cortex (37 stars, last pushed 2mo ago), licensed MIT. It adds 73 tokens to every session and 2,397 once invoked, about $0.0004 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 2026-09-03.
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