greg-isenberg-voice

greg-isenberg-voice is a skill for Claude Code from jpeslar1/john-peslar-ai-skills. It costs 205 tokens per session (3,823 once invoked), scanned A, original, MIT.

A writing guide based on Greg Isenberg’s style for discussing internet businesses and communities. It focuses on presenting startup ideas, niche opportunities, and practical ways to build small businesses.

In plain words
What is it for?
Use it for startup-idea lists, niche-business breakdowns, community strategies, and content about internet businesses.
Why use it?
It helps turn a broad idea into a concrete opportunity with a target audience and a simple business case. It also gives idea lists a lively, easy-to-scan structure.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: positional $N argument; mentions Claude Code.

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

Good fit Use it for startup-idea lists, niche-business breakdowns, community strategies, and content about internet businesses.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/jpeslar1/john-peslar-ai-skills/greg-isenberg-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 greg-isenberg-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 greg-isenberg-voice

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/jpeslar1/john-peslar-ai-skills/greg-isenberg-voice"><img src="https://agentmods.dev/badge/skills/jpeslar1/john-peslar-ai-skills/greg-isenberg-voice.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 205 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,823 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 $0.00205 $0.03823
Opus 5.5 $0.00082 $0.01529
Sonnet 5.5 $0.00041 $0.00765
Haiku 4.5 $0.00020 $0.00382

Measured 18d ago against content hash 993f4d0ed31f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

greg-isenberg-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.

greg-isenberg-voice/SKILL.md · 176 lines

How it starts

The opening of the file, as written. The whole thing — 176 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Greg Isenberg Voice DNA

Greg Isenberg is the internet's startup-ideas guy: he runs a holding company of his own, hosts The Startup Ideas Podcast, and has written a weekly letter (Late Checkout on Substack in 2023, Greg's Letter on gregisenberg.com since) that sells the reader a picture of a cash-flowing, community-powered, small-team business and then hands them a list of ways to build one. The written voice is a hot take with a justification and a kicker, a scene you can see (a quiet Slack with a channel called "cha-ching"), a dollar figure with casual math beside it, and a slogan to close. On X it drops to lowercase, two lines, setup then punchline. 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 declaratives, 6-12 words, many of them 3-6: "Less is more." / "Patient people win." / "Product over everything."
  • Repetition triplets carry the argument: "The tools are basically free now. The distribution is basically free. The barriers are basically gone." Then a one-line turn: "What used to require venture capital now requires a weekend."
  • Newsletter paragraphs are 1-3 sentences; roughly 40% of lines are one sentence. The Loom post stacks three "They never talked about" lines as separate lines.
  • Each hot take is a three-beat unit: claim ("Solopreneurs = Solo Burnouts."), justification ("Think you're a one-man/woman army? Cool, give it a year."), kicker ("You'll be so fried you'll hire a team just to get a day off.").
  • On X: one lowercase sentence of 15-35 words, no terminal punctuation, or a two-line setup and punchline ("imagine cold plunging everyday to enhance productivity but you've never tried claude code / i don't get it").

Hook patterns

  1. The self-aware importance claim - "This might be the most important post I've written in a while." Deploy once in a long while, for the letter that is actually about the reader's life rather than a tactic.
  2. The consensus, then the slap - "People are saying ChatGPT wrapper startups are dead-on-arrival. Couldn't be less true." / "Everyone says 'start when you have nothing to lose.' That's backwards." Deploy as the opener of any contrarian take or hot-take item.
  3. The money receipt - "Instagram sold for $1B with 13 employees. WhatsApp sold for $19B with 55 employees." Deploy to open a thesis about small teams, leverage, or timing; the lesson follows in one line ("Each employee matters so much in internet businesses. Less is more.").
  4. The confessed miss - "I passed on investing in their pre-seed round when they were only worth ~$6.5M. So, my $25k could have turned into a whopping $3M-$4M…ouch." Deploy for lessons-learned content; the miss licenses the lesson.
  5. The spicy announcement - "The other day I was feeling very spicy. So, I published a 'spicy' hot takes on the tech industry on X where 'I said the quiet parts out loud'. And, it went mega viral." Deploy to introduce a list of takes, with the social-proof beat attached.
  6. The X setup and punchline - "imagine cold plunging everyday to enhance productivity but you've never tried claude code / i don't get it". Deploy for short-form only; lowercase, no period.

Read the full file on GitHub · 176 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 · 176 lines · 205 tokens per session scan A 993f4d0ed31f

Subscribe to this mod's changes

greg-isenberg-voice is a skill published in the GitHub repository jpeslar1/john-peslar-ai-skills (12 stars, last pushed 18d ago), licensed MIT. It adds 205 tokens to every session and 3,823 once invoked, about $0.0008 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.

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greg-isenberg-voice next to 6 skills from other repositories
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