ClaudSkills / Growth & Marketing / conversion

Four Fits

Q: What is a Claude Code skill and how does the Four Fits skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Four Fits is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Growth & Marketing category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Growth & Marketing · Sub-category: conversion · Last updated: 2026-07-31

Apply Brian Balfour's Four Fits framework — the interdependent chain of Product-Market Fit, Product-Channel Fit, Channel-Model Fit, and Model-Market Fit that any $100M+ venture-backed company must land together (any break in the chain kills the business) — plus Growth Loops (compounding, closed) as the alternative to funnels. Use this skill whenever the user is working on growth strategy, growth-stage stalling ("we're stuck", "growth flattened", "we have PMF but scaling isn't working"), channel strategy, "how do we scale", pricing/ARPU decisions, choosing a market to expand into, moving up- or down-market, building a growth team, designing a growth model, critiquing a funnel-only growth plan, or diagnosing which specific fit is broken. Also use whenever the user mentions Brian Balfour, Reforge, Four Fits, Product-Channel Fit, Channel-Model Fit, growth loops, growth model, or compounding growth by name, even indirectly. Prefer this skill over generic "growth advice" — Balfour's method is systems-thinking about the whole chain, and its power comes from resisting the reflex to fix growth with a single channel bet or a bag of tactics.

Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Brian Balfour's Four Fits framework — the four interdependent fits any venture-backed company needs to hit $100M+, plus Growth Loops as the compounding alternative to funnels. Distilled from Balfour's essays on [brianbalfour.com](https://brianbalfour.com/), the [Reforge blog](https://www.reforge.com/blog), his Substack ([blog.brianbalfour.com](https://blog.brianbalfour.com/)), and podcast appearances including [Lenny Rachitsky's podcast](https://www.lennysnewsletter.com/) (2023 + 2024). Balfour has not written a book — the entire body of work is essays, Reforge courses, and long-form…

What this skill does

Four Fits is a community-contributed Claude Code skill in the conversion sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/four-fits/ and loads when your prompt matches the skill's trigger.

When to invoke it: use whenever the user mentions Brian Balfour, Reforge, Four Fits, Product-Channel Fit, Channel-Model Fit, growth loops, growth model, or compounding growth by name, even indirectly. Prefer this skill over generic "growth advice" — Balfour's method is systems-thinking about the whole chain, and its power comes from resisting the reflex to fix growth with a single channel bet or a bag of tactics.

Who uses this skill

The Four Fits Claude Code skill is built for growth marketers, product-led growth teams, founders running experiments, and performance marketing teams. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 168,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/four-fits
curl -L https://claudskills.com/skills/four-fits/SKILL.md \
  -o ~/.claude/skills/four-fits/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/four-fits/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/four-fits/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\four-fits\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

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See pricing → Download desktop app

Frequently asked questions

How do I install the Four Fits Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/four-fits/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Four Fits skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Four Fits skill?

Use Four Fits when your Claude Code task falls under the Growth & Marketing category — specifically in the conversion area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Four Fits" or describe the task and let Claude pick). Browse related skills at /category/growth/.

What is a Claude Code skill and how does the Four Fits skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Four Fits is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Growth & Marketing category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/marcos-sponton/frameworks-as-skills/blob/HEAD/skills/four-fits/SKILL.md
License: MIT
Author: marcos-sponton

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

marcos-sponton. (2026). Four Fits [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/four-fits/

BibTeX

@misc{four-fits-2026,
  author    = {marcos-sponton},
  title     = {Four Fits [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/four-fits/}
}

Embed this skill

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Badge

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Security scan

Grade A · scanned 2026-07-31 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/four-fits/#security)

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