what-would-lenny-do

what-would-lenny-do is a skill for Claude Code from amplitude/mcp-marketplace. It costs 84 tokens per session (2,246 once invoked), scanned C, original, MIT.

A research guide for answering product, growth, pricing, hiring, and leadership questions from Lenny Rachitsky's archive of newsletters and podcast interviews.

In plain words
What is it for?
Use it only when the required archive-search tools are connected, to research decisions about products, teams, growth, pricing, or leadership.
Why use it?
It helps turn a broad business dilemma into a focused question and find relevant advice, frameworks, and examples from that archive.

Skill for Claude Code

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

Part of the amplitude plugin — 37 skills shipped together

Good fit Use it only when the required archive-search tools are connected, to research decisions about products, teams, growth, pricing, or leadership.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/amplitude/mcp-marketplace/what-would-lenny-do
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 amplitude/mcp-marketplace --skill what-would-lenny-do
Clone the repo
git clone --depth 1 https://github.com/amplitude/mcp-marketplace

Made for: Claude Code.

Or install amplitude, the plugin that ships this one along with the rest of its 37 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 what-would-lenny-do

README.md
[![agentmods](https://agentmods.dev/badge/skills/amplitude/mcp-marketplace/what-would-lenny-do/github.svg)](https://agentmods.dev/skills/amplitude/mcp-marketplace/what-would-lenny-do)
Your own site
<a href="https://agentmods.dev/skills/amplitude/mcp-marketplace/what-would-lenny-do"><img src="https://agentmods.dev/badge/skills/amplitude/mcp-marketplace/what-would-lenny-do/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 what-would-lenny-do

Your own site · 80×15
<a href="https://agentmods.dev/skills/amplitude/mcp-marketplace/what-would-lenny-do"><img src="https://agentmods.dev/badge/skills/amplitude/mcp-marketplace/what-would-lenny-do.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 84 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,246 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. 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 $0.00084 $0.02246
Opus 5 $0.00042 $0.01123
Sonnet 5 $0.00017 $0.00449
Haiku 4.5 $0.00008 $0.00225

Measured 12d ago against content hash 4de3e9410322, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade C, and why

what-would-lenny-do scanned grade C with 1 finding 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 12d 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.

Tells the agent never to refusehighAnti-refusal

Suppressing the ability to decline removes a core safety control; a later harmful request then succeeds.

- **Don't refuse to make a call** because "it depends." Acknowledge the key variables but still commit to a recommendation for the most likely scenario.
plugins/amplitude/skills/what-would-lenny-do/SKILL.md · 151 lines

How it starts

The opening of the file, as written. The whole thing — 151 lines — stays where its author put it; the contents beside it link to each section on GitHub.

What Would Lenny Do?

You are channeling Lenny Rachitsky's product wisdom. Given the question or dilemma at hand, you will intelligently navigate his archive of newsletters and podcast interviews to surface the most relevant frameworks, operator experiences, and hard-won lessons — then synthesize them into a concrete, opinionated recommendation.

Instructions

Phase 1: Understand the Question

Before searching, extract the core question from the conversation:

  • What is the user actually trying to decide or understand?
  • What domain does it fall in? (strategy, growth, pricing, leadership, hiring, AI, B2B, B2C, product development, team dynamics, etc.)
  • What are the key themes, tension points, and specific terms in the question?
  • What's the user's likely role and context (PM, founder, exec, growth lead)?

This framing shapes everything — a sharp question leads to a sharp search.

Phase 2: Search the Archive (2-3 parallel searches)

Run 2-3 searches in parallel to cast a wide net before committing to a read.

  1. Primary keyword searchlennysdata:search_content with the most specific terms from the question. Use concrete, practitioner-level language, not abstract categories. Examples: "pricing AI product outcomes", "stalled growth logo retention", "trust AI features adoption".

  2. Thematic searchlennysdata:search_content with a broader or adjacent set of keywords to surface analogous frameworks or situations. If the first search is about a specific scenario, the second should look for the underlying principle.

  3. Exploratory browse (if needed) — if searches return fewer than 3 strong candidates, use lennysdata:list_content to browse recent content by date. Scan titles and descriptions for relevance.

Use the type, date, tags, and description fields in results to pre-screen relevance before committing to a full read. Recent content (2025–2026) often reflects the sharpest current thinking.

Phase 3: Select and Read (2–4 pieces)

Read the full file on GitHub · 151 lines

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. 12d ago First seen · 151 lines · 84 tokens per session scan C 4de3e9410322

Subscribe to this mod's changes

what-would-lenny-do is a skill published in the GitHub repository amplitude/mcp-marketplace (35 stars, last pushed 3d ago), licensed MIT. It adds 84 tokens to every session and 2,246 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it C with 1 finding (tells the agent never to refuse). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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