Startup founder

Lean canvas builder

Immediate result: A filled Lean Canvas with the weakest blocks highlighted and what to learn next.

Problem it solvesBusiness plans take weeks; founders need the model on one page to spot the weak block.

Download SKILL.md
Add this skill to
ChatGPTClaudeGeminiPerplexity

You paste

App connecting home bakers with customers in their apartment complex

You get

UVP: Fresh cakes from bakers in your own building, ordered by 6 pm, delivered by 8.

Channels: assumed — RWA WhatsApp groups (untested).

Weakest: unfair advantage — none yet. Consider exclusive RWA partnerships.

About this skill

About Lean canvas builder

Business plans take weeks, but founders need to see the whole model on one page to find the weak part. This skill fills the nine blocks of a Lean Canvas from what you know, writes the unique value proposition in one sentence, and marks every block as known, assumed or unknown. It names the weakest block and the experiment that would strengthen it. Update the canvas as you learn and it becomes a running record of how the business model is evolving. To use it, paste the skill into your assistant and send your idea, target customers and anything you know about pricing and channels; the reply opens with “Canvas”.

Lean canvas builder AI skill for Startup founder: you paste "App connecting home bakers with customers in their apartment complex" and get "UVP: Fresh cakes from bakers in your own building, ordered by 6 pm, delivered by 8."
Lean canvas builder — example input and the first lines it returns. Works in ChatGPT, Claude and Gemini.
Job profile
Founders & small business · Startup founder
Works in
ChatGPT, Claude, Gemini, Copilot, Claude Code
Format
Agent Skills (SKILL.md)
Price
Free, no sign-up
Install instructions

Copy, paste, send

  1. Cold email writerCopy skillCopied ✓1 Copy the skillPress Copy skill.
  2. ANY AI ASSISTANTSKILLPaste here, then press Enter2 Paste it into a new chatChatGPT, Claude, Gemini or Copilot.
  3. ANY AI ASSISTANT3 Send your inputSend your idea.
The skill — paste this into your AI assistant
# Skill: Lean canvas builder

You are running the "Lean canvas builder" skill for me. I work as: Startup founder. What I need from you: a filled Lean Canvas with the weakest blocks highlighted and what to learn next.

## When I send you my idea, target customers and anything I know about pricing and channels
1. Fill the nine Lean Canvas blocks.
2. Write the unique value proposition in one sentence.
3. Mark each block as known, assumed or unknown.
4. Name the block to work on first.

## Reply in this format
- Canvas (nine blocks)
- Known / assumed / unknown
- Weakest block and why
- Next experiment

## Rules
- Use only the facts I give you; mark anything you had to assume with [ASSUMPTION].
- If something essential is missing, ask me one short question, then continue.
- No preamble or filler: start with the result.

Confirm you're ready in one line, then wait for me to send my idea, target customers and anything I know about pricing and channels.

Then sendYour idea, target customers and anything you know about pricing and channels. For example: App connecting home bakers with customers in their apartment complex

ChatGPT

  1. Fastest: paste the skill as your first message in a new chat, then send your input.
  2. To keep it: open a Project, choose Instructions (or Settings → Personalization → Custom instructions for every chat) and paste it there.
  3. To share it with a team: create a custom GPT and paste the skill into its Instructions.
  4. In the Codex app: copy the skill's folder into ~/.codex/skills/ (or Customize → Skills → Add → Create skill).

Claude

  1. Fastest: paste the skill as your first message in a new chat, then send your input.
  2. To keep it: create a Project, open Project instructions and paste the skill.
  3. As a Claude Skill: download the skill's ZIP, then in Claude open Settings → Skills → Add → Upload skill and choose the file.

Gemini

  1. Fastest: paste the skill as your first message in a new chat, then send your input.
  2. To keep it: open Gems → New Gem, paste the skill into Instructions and save.

Microsoft Copilot

  1. Fastest: paste the skill as your first message, then send your input.
  2. In Microsoft 365 Copilot, save it as a prompt or paste it into an agent's instructions to reuse it.

Any other assistant

  1. Paste the skill as the system prompt or first message in any chat assistant (Perplexity, Meta AI, DeepSeek, Mistral, local models).
  2. Coding agents that read the Agent Skills format (SKILL.md) can load the downloaded file from their skills folder.

Install it permanently

Upload it to Claude, add it to ChatGPT's Codex app, clone it into Claude Code, or download the SKILL.md for any agent. Full guide with screenshots →

Download the ZIP and upload it in Claude. Claude then uses the skill on its own whenever a request matches.

Download ZIP

Quick setup

  1. In Claude, open Settings → Skills (under Customize).
  2. Click Add → Upload skill.
  3. Choose the ZIP — don't unzip it — and make sure the skill is switched on.
Claude Settings with Skills selected under Customize, and the Add menu open showing Upload skill, Create a skill, Create with Claude and Record your screen

Repositoryscienceofapps.com/skills/ai-skills.git · all 200 skills, one folder each, plain git over HTTPS

What it does

The steps it follows

  1. Fill the nine Lean Canvas blocks.
  2. Write the unique value proposition in one sentence.
  3. Mark each block as known, assumed or unknown.
  4. Name the block to work on first.
What you get back

The reply format

  • Canvas (nine blocks)
  • Known / assumed / unknown
  • Weakest block and why
  • Next experiment
FAQs

Questions about Lean canvas builder

What does the Lean canvas builder skill do?

Business plans take weeks; founders need the model on one page to spot the weak block. The skill fixes that: a filled Lean Canvas with the weakest blocks highlighted and what to learn next.

How do I install Lean canvas builder in ChatGPT, Claude or Gemini?

Copy the skill and paste it as the first message of a new chat, then send your input. To keep it, paste it into a ChatGPT Project or custom GPT, a Claude Project or a Gemini Gem, or upload the SKILL.md file as a Claude Skill.

What do I send Lean canvas builder after installing it?

Send your idea, target customers and anything you know about pricing and channels. If something essential is missing, the skill asks you one short question and then continues.

Is the Lean canvas builder skill free?

Yes. It's free to copy, use and adapt, with no sign-up, and works in the free versions of ChatGPT, Claude, Gemini and Copilot.

More for founders & small business
Startup founder

Pitch deck outline

ProblemPitch decks bury the story in features, and investors stop reading after slide three.

You paste

B2B SaaS for clinic billing, ₹18 lakh ARR, 60 clinics, raising ₹4 crore seed

You get

Slide 1: 'Indian clinics lose 8–12% of revenue to billing errors' — source needed.

Slide 6 Traction: 60 clinics, ₹18 lakh ARR — add monthly growth and churn.

Challenge: 'Why won't Practo build this?'

Immediate resultA 12-slide outline with the headline, content and evidence for each slide.

How to use it
Startup founder

Monthly investor update

ProblemFounders skip investor updates when things are hard, which is exactly when investors can help.

You paste

Revenue ₹9.2 lakh (+12%), burn ₹22 lakh, runway 11 months, lost a big pilot, hiring a CTO

You get

Headline: Revenue up 12% to ₹9.2 lakh; lost the Apollo pilot; 11 months of runway.

Miss: the pilot ended because integration took 9 weeks, not 3 — we're building a CSV import.

Ask: intros to CTOs who've scaled healthtech platforms.

Immediate resultA monthly update: headline, metrics, wins, misses, asks and what's next.

How to use it
Founder / product lead

Competitor teardown

ProblemFounders either ignore competitors or copy them, without understanding their strategy.

You paste

Website + 50 Play Store reviews of a competing fitness app

You get

Positioning: 'gym in your pocket' for beginners.

Hate: 19 reviews mention aggressive renewal charges.

Gap: clear, cancel-anytime pricing as a promise.

Immediate resultA teardown of a competitor's positioning, product, pricing, acquisition and weaknesses.

How to use it

All 12 founders & small business skillsAll 200 skillsRead it in the articleProve it: AI for Entrepreneurs and Founders Certification (free test)

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