claude-hopkins-voice

claude-hopkins-voice is a skill for Claude Code from jpeslar1/john-peslar-ai-skills. It costs 240 tokens per session (4,247 once invoked), scanned A, original, MIT.

A style guide based on Claude Hopkins’s advertising writing. It describes short sentences, reason-based selling, measured results, and source references from his public-domain books.

In plain words
What is it for?
Use it for product pages, sales letters, and advertising copy written in a plain, evidence-focused voice.
Why use it?
It gives an agent a clear, historically grounded writing style instead of vague instructions to sound persuasive. It also helps keep advertising claims tied to evidence.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the voice-dna plugin — 79 skills shipped together

Good fit Use it for product pages, sales letters, and advertising copy written in a plain, evidence-focused voice.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/jpeslar1/john-peslar-ai-skills/claude-hopkins-voice
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 jpeslar1/john-peslar-ai-skills --skill claude-hopkins-voice
Clone the repo
git clone --depth 1 https://github.com/jpeslar1/john-peslar-ai-skills

Made for: Claude Code.

Or install voice-dna, the plugin that ships this one along with the rest of its 79 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.

agentmods badge for claude-hopkins-voice

README.md
[![agentmods](https://agentmods.dev/badge/skills/jpeslar1/john-peslar-ai-skills/claude-hopkins-voice/github.svg)](https://agentmods.dev/skills/jpeslar1/john-peslar-ai-skills/claude-hopkins-voice)
Your own site
<a href="https://agentmods.dev/skills/jpeslar1/john-peslar-ai-skills/claude-hopkins-voice"><img src="https://agentmods.dev/badge/skills/jpeslar1/john-peslar-ai-skills/claude-hopkins-voice/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 claude-hopkins-voice

Your own site · 80×15
<a href="https://agentmods.dev/skills/jpeslar1/john-peslar-ai-skills/claude-hopkins-voice"><img src="https://agentmods.dev/badge/skills/jpeslar1/john-peslar-ai-skills/claude-hopkins-voice.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 240 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,247 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 $0.00240 $0.04247
Opus 5.5 $0.00096 $0.01699
Sonnet 5.5 $0.00048 $0.00849
Haiku 4.5 $0.00024 $0.00425

Measured 18d ago against content hash 08d6c5b36d0d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

claude-hopkins-voice 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 18d 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.

claude-hopkins-voice/SKILL.md · 174 lines

How it starts

The opening of the file, as written. The whole thing — 174 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Claude Hopkins Voice DNA

Claude Hopkins is the man who made advertising answer to a coupon count. He wrote in short flat sentences because the common people he sold to feared literary style, he anchored every rule to a traced return because mail order had taught him that guesswork was a confession, and he judged every line by whether a salesman would say it to one buyer face to face. The register is doctrinal and plain: parallel negations ("It is not for general effect. It is not to keep your name before the people."), parallel imperatives ("Don't try to be amusing. Don't boast."), a homely simile, and a one-line moral to close. The memoir adds first person and a reported scene but keeps the cadence. Both books are public domain, so the excerpts here are his exact words. Ground every output in references/voice-corpus.md (verbatim excerpts) and references/source-map.md (sources and refresh notes).

Voice DNA

Cadence and rhythm

  • Short indicative sentences of 4-9 words stacked three to six deep with no connective: "Advertising is salesmanship. Its principles are the principles of salesmanship. Successes and failures in both lines are due to like causes."
  • Parallel negation and parallel imperative are the two building blocks: "It is not for general effect. It is not to keep your name before the people." / "Don't try to be amusing. Money spending is a serious matter. Don't boast, for all people resent it."
  • The only hinges are "Thus", "So", "Therefore", "That being so". Subordinate clauses are rare and short.
  • Paragraphs run 3-6 sentences and end on the principle. Chapters run 800-1,500 words and close on a one-line moral.
  • A number arrives within a sentence or two of every claim: "Again and again we see 20 percent of all the readers of a newspaper cut out a certain coupon."
  • The memoir register adds first person and reported dialogue at the same tempo: "I came back to the office amazed. I said: "Why don't you tell people these things?""

Hook patterns

  1. The flat law - state the principle as a settled fact in four words: "Advertising is salesmanship." / "Human nature is perpetual." Deploy as the first sentence of any doctrinal piece; the rest of the paragraph is its consequence.
  2. The denied commonplace - name the common belief and dismiss it in one short sentence: "It is commonly said that people do not read advertisements. That is silly, of course." Deploy to open a correction, then pay it with a traced figure.
  3. Hey there, Bill Jones - the headline as a shout to one person in a crowd: "The purpose of a headline is to pick out people you can interest." Deploy as the headline test on every piece: does it name the buyer?
  4. The cost comparison - put the wasteful figure beside the possible one: "Men spending five dollars to do what one dollar might do. Men getting back 30 percent of their cost when they might get 150 percent." Deploy to make waste concrete.
  5. The untold common story - the fact every competitor has and none has stated: "I told a story common to all good brewers, but a story which had never been told. I gave purity a meaning." Deploy as the research brief for reason-why copy.
  6. The costly habit - a vivid instance of a project that fails on arithmetic: "To sell shaving soap to the peasants of Russia one would first need to change their beard-wearing habits. The cost would be excessive." Deploy to kill a brief before money is spent.

Read the full file on GitHub · 174 lines

Files

What ships with it

2 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.

  1. 18d ago First seen · 174 lines · 240 tokens per session scan A 08d6c5b36d0d

Subscribe to this mod's changes

claude-hopkins-voice is a skill published in the GitHub repository jpeslar1/john-peslar-ai-skills (12 stars, last pushed 18d ago), licensed MIT. It adds 240 tokens to every session and 4,247 once invoked, about $0.0010 per session on Opus 5.5. 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 2026-10-19.

Related

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claude-hopkins-voice next to 6 skills from other repositories
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