ai-agent

build-your-own-x: Learn by Recreating

Name: build-your-own-x: Learn by Recreating
Author: codecrafters-io

Improve programming skills by rebuilding tech from scratch. For startup founders and programmers.

advanced⏱ 1-2 days💵 Free

552,965 stars+2,950★ this week51,895 forksMarkdownGuide quality 9/10 · reviewed Jun 30Updated 7/14/2026100% free · open source

What it is

Create replicas of your favorite technologies from scratch.

Real use case example

"A founder wanting to understand how their favorite SaaS app handles user authentication can rebuild it using this skill."

Best insideCodex CLIGPT (ChatGPT)ContinueAny AI Client

When to use it

•When you want to deeply understand how a specific technology works
•When you're looking to improve your programming skills through hands-on exercises
•When you need to customize or extend an existing technology for your startup

Ready-to-paste prompt

Start with the 'build-your-own-redis' guide by navigating to the corresponding Markdown file and following the instructions to recreate a simplified version of Redis

Heads up: Make sure you have a good understanding of programming fundamentals and the specific technology you're trying to recreate, as the guides assume a certain level of prior knowledge and may not provide extensive explanations of basic concepts

Saves to your device

Use with Claude

New

Skip the builder — one click puts this in Claude, Cursor, Antigravity and more.

⚡ Runs out of the box

A prompt/skill package — nothing to install beyond adding it to your AI tool.

Try it instantly — no install

Claude Code

mkdir -p ~/.claude/skills/build-your-own-x && curl -fsSL https://workflowstacks.com/api/skills/build-your-own-x/claude-skill -o ~/.claude/skills/build-your-own-x/SKILL.md

Open in another AI app

Opens the app with this repo with the prompt ready to go — no copy-paste needed.

Connect the whole catalog (MCP)

claude mcp add --transport http workflowstacks https://workflowstacks.com/api/mcp

Adds a WorkflowStacks connector to Claude Code: search and load any skill here by chatting.

How build-your-own-x: Learn by Recreating works

Codeflow

Free to inspect

Build-your-own-x: Learn by Recreating is a documents-only repository (2 doc files) — something you read, not something you run. There is nothing to install. Last commit a month ago, no license file.

Size

Documents only

2 documents · 10 min skim

Setup

Nothing to install

A guide / curated list. Just read it and follow the links.

Runs on

Nowhere — you read it

A reading resource, not a program.

Markdown 100%

Where to start reading

1
README.md
Start here — what it does and how to install it

READMENo licenseUpdated 1 mo ago

Use with Claude

New

Skip the builder — one click puts this in Claude, Cursor, Antigravity and more.

⚡ Runs out of the box

A prompt/skill package — nothing to install beyond adding it to your AI tool.

Try it instantly — no install

Claude Code

mkdir -p ~/.claude/skills/build-your-own-x && curl -fsSL https://workflowstacks.com/api/skills/build-your-own-x/claude-skill -o ~/.claude/skills/build-your-own-x/SKILL.md

Open in another AI app

Opens the app with this repo with the prompt ready to go — no copy-paste needed.

Connect the whole catalog (MCP)

claude mcp add --transport http workflowstacks https://workflowstacks.com/api/mcp

Adds a WorkflowStacks connector to Claude Code: search and load any skill here by chatting.

Quick Actions

Details

Creator

codecrafters-io

Language

Markdown

Do this with a working workflow

Pages we wrote and tested that put a skill like this to work — importable n8n templates, outcome guides and Claude Desktop configs.

Outcome guide

Score your leads by ideal-customer fit

You describe your ideal customer once and keep leads in a Google Sheet. The workflow scores each 1–5 for fit with a one-line reason, so you sort and work the best first.