Lean Startup
Build-Measure-Learn methodology
Validate ideas fast with Eric Ries's Build-Measure-Learn methodology. This skill equips your AI agent with lean thinking — from defining MVPs and setting up experiments to pivoting based on validated learning instead of gut feelings.
npx skills add wondelai/skills/lean-startup --global 
The Lean Startup Eric Ries View on Amazon
02 What it is
What is the Lean Startup skill?
Lean Startup is a free AI agent skill built on Eric Ries’s book. It puts Build-Measure-Learn in your agent’s hands: name the leap-of-faith assumption, design the smallest experiment that could disprove it, choose one actionable metric over the flattering ones, and write down the pivot-or-persevere threshold before the experiment is allowed to run.
03 Key concepts
Five principles your agent applies.
Drawn from The Lean Startup — not advice it repeats back to you, but decisions it makes while it works.
04 Fit
When to use it, and
when not to.
four symptoms it fixes, and four it doesn't.
Reach for it when
You have a twelve-month build plan and no evidence at all that anyone wants the first month of it.
Signups rise every week, the chart looks wonderful, and nobody can say whether the business is working.
The team has argued about a feature for six weeks when a landing page and two hundred visitors would settle it.
You suspect the strategy is wrong, but “pivot” has become a word nobody will say out loud without a number behind it.
Reach for something else when
The experiment wants to be a facilitated week with a prototype and five users in the room. Design Sprint has the schedule.
The learning has to come from conversations rather than instrumented behavior. The Mom Test is the sharper instrument.
You already have fit and need a delivery cadence with capped scope. The 37signals Way bets in six-week cycles.
You need the metric definitions, stage gates and business-model archetypes themselves. that is Lean Analytics.
05 Prompts
Say it like this.
Name the skill at the end of a prompt and the agent applies the framework rather than a vibe. Or say nothing — it loads on its own when a task matches.
Define an MVP scope for my product idea using lean-startup skill
Design a validation experiment for our new feature hypothesis using lean-startup skill
Set up innovation accounting metrics for our startup using lean-startup skill
Help me decide whether to pivot or persevere based on these metrics using lean-startup skill
06 About the author
07 Same stack
The stack it sits in.
Ten Product & Innovation skills. Most people run two: this one, and whichever fits the next problem.
All Product & Innovation skills08 Questions
Before you install.
How do I install the Lean Startup skill?
Run npx skills add wondelai/skills/lean-startup --global. It takes about 30 seconds and needs no account. The Lean Startup skill then works in Claude, Claude Code, Claude Cowork, Codex, Cursor, OpenClaw and Hermes Agent — anything that reads the open agentskills.io format — and your agent loads it on its own when a task calls for it. It is free and MIT-licensed, and the source is at https://github.com/wondelai/skills.
Which book is the Lean Startup skill based on?
It packages The Lean Startup by Eric Ries — pioneer of the Lean Startup movement. The skill distils the book's method into instructions your agent follows while it works, covering build-measure-learn, minimum viable product and validated learning. It sits in the Product & Innovation part of the library.
How does this differ from the Design Sprint skill?
A Design Sprint is one event with a fixed five-day agenda; Build-Measure-Learn is a loop you never stop running. The sprint is superb at the first question — does this concept survive contact with five real people — and then it is over. Lean Startup keeps going after launch, on real usage, with cohorts and innovation accounting deciding whether to pivot. Plenty of teams use a sprint to buy the first answer cheaply and this skill to keep earning the rest.
What actually counts as an MVP?
The smallest thing that produces the learning, which is usually not software. The skill will push you toward a smoke test (a page, a price, a signup button, no product), a concierge MVP (you do the work by hand while the customer experiences a service), or a Wizard of Oz (a real interface with a human behind the curtain). The measure is not how small it is — it is whether a specific result would change what you do next. If nothing would, you are building, not learning.
Is the book still worth reading?
The skill carries the machinery: the loop, the MVP types, innovation accounting, the taxonomy of pivots from zoom-in to engine-of-growth, and the three engines — sticky, viral, paid. The book is where the argument lives: that a startup is an institution for managing extreme uncertainty, and that most of what feels like progress inside one is not. That framing is the bit people carry for a decade; the mechanics are the bit an agent can apply on a Tuesday afternoon.
Doesn’t “MVP” just become an excuse for shipping something bad?
Constantly, and no skill can stop you. Ries’s MVP earns its embarrassment only if you wrote down beforehand what result would change your mind. Shipping a thin slice of your full plan, measuring nothing, and calling it an MVP is exactly the behavior the book argues against — you pay the reputational cost and collect none of the information. If your agent cannot state the hypothesis and the threshold, you do not have an MVP, you have a rushed release.
09 Guides that use it
Put it to work.
Long-form playbooks where this skill does part of the job.
One skill, one command.
Install Lean Startup, or the whole stack.
npx skills add wondelai/skills/lean-startup --global MIT licensed · Claude, Claude Code, Codex, Cursor, OpenClaw, Hermes · No account