Lenny Skills is a collection of product-management and engineering workflows for Claude Code and other AI agents, covering areas such as strategy, research, planning, shipping, growth, and hiring. Each skill gives an agent specialized guidance, frameworks, checklists, or templates for product work, and the catalogue contains many of these skills.
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 skills add RefoundAI/lenny-skills --skill plg-fundamentalsgit clone --depth 1 https://github.com/RefoundAI/lenny-skillsWrote 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/refoundai/lenny-skills/plg-fundamentals)<a href="https://agentmods.dev/skills/refoundai/lenny-skills/plg-fundamentals"><img src="https://agentmods.dev/badge/skills/refoundai/lenny-skills/plg-fundamentals/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.
<a href="https://agentmods.dev/skills/refoundai/lenny-skills/plg-fundamentals"><img src="https://agentmods.dev/badge/skills/refoundai/lenny-skills/plg-fundamentals.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00035 | $0.01161 |
| Opus 5 | $0.00017 | $0.00580 |
| Sonnet 5 | $0.00007 | $0.00232 |
| Haiku 4.5 | $0.00003 | $0.00116 |
Grade A, and why
plg-fundamentals 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 13d 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 — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.
PLG Fundamentals
Transform your product into the primary engine for distribution, activation, and expansion.
Help the user with plg fundamentals using insights from 9 guests and posts across Lenny's Podcast and Newsletter.
How to Help
- Assess Viability - Determine if your product and target market are suited for a self-serve motion based on complexity and volume.
- Audit Infrastructure - Evaluate the data and experimentation tools needed to track and influence user behavior without manual intervention.
- Map the Journey - Identify where manual sales or marketing steps can be replaced by automated product experiences.
- Prioritize Levers - Focus initial efforts on the funnel stage with the highest friction, whether that is acquisition, activation, or conversion.
Core Principles
Product as the Primary Vehicle
From "Five steps to starting your product-led growth motion": "At its core, product-led growth (PLG) is about leveraging your product to acquire, activate, convert, retain, and monetize your user base. In PLG, your product is not only the set of features that solve customer pain points but also your go-to-market (GTM) motion, and your distribution and engagement channel."
Success requires shifting from the mindset that sales and marketing drive growth to one where the product handles distribution and revenue generation.
Workflow-Integrated Value Sampling
Albert Cheng: "What if we actually sampled a number of different paid suggestions and interspersed them to free users across their writing? All of a sudden, people were seeing Grammarly as a much more powerful tool than they were before."
Rather than keeping features locked behind a paywall, demonstrate the potential of paid tiers by interspersing premium value directly into the free user workflow.
Automation of Repetitive Sales Tasks
Laura Schaffer: "I've noticed this pattern where I'm repeating things over and over again and they're asking the same thing. I think we should put that online. I think we should make that available so they can just see it and then buy it, because we had an online checkout process."
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.
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.
- 13d ago First seen · 77 lines · 35 tokens per session scan A c5bd9aa89754
plg-fundamentals is a skill published in the GitHub repository RefoundAI/lenny-skills (1,321 stars, last pushed 1mo ago), licensed MIT. It adds 35 tokens to every session and 1,161 once invoked, about $0.0002 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 2026-08-30.
Other skills, from other repositories
llama-cpp
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systematic-debugging
Use when encountering any bug, test failure, or unexpected behavior. 4-phase root cause investigation — NO fixes without understanding the problem first.
github-auth
Set up GitHub authentication for the agent using git (universally available) or the gh CLI. Covers HTTPS tokens, SSH keys, credential helpers, and gh auth — with a detection flow to pick the right method automatically.
ideation
Generate project ideas through creative constraints. Use when the user says 'I want to build something', 'give me a project idea', 'I'm bored', 'what should I make', 'inspire me', or any variant of 'I have tools but no direction'. Works for code, art, hardware, writing, tools, and anything that can be made.
notion
Notion API for creating and managing pages, databases, and blocks via curl. Search, create, update, and query Notion workspaces directly from the terminal.
ocr-and-documents
Extract text from PDFs and scanned documents. Use webextract for remote URLs, pymupdf for local text-based PDFs, marker-pdf for OCR/scanned docs. For DOCX use python-docx, for PPTX see the powerpoint skill.