claude-skill

Build Claude Code

Name: Build Claude Code
Author: Windy3f3f3f3f

Create your own coding agent with Claude Code from scratch, a tutorial for founders, 2.2k+ GitHub stars

2,220 stars480 forksPythonQuality 8/10Updated 7/9/2026100% free · open source

What it does

Create a custom coding agent from scratch using Claude Code's open-source architecture, replicating its core functionality with approximately 4,000 lines of code in Python or TypeScript.

Install / run

Clone the repository from GitHub using the command `git clone https://github.com/Windy3f3f3f3f/claude-code-from-scratch.git`

When to use it

•When you need a tailored coding assistant for your specific development workflow
•To understand the inner workings of Claude Code and modify it to suit your requirements
•As a learning resource to grasp the fundamentals of coding agents and their architecture

Quick start

1Navigate to the cloned repository using `cd claude-code-from-scratch`
2Follow the 11-chapter tutorial provided in the repository to build the coding agent from scratch
3Focus on the Python implementation, as it is one of the primary languages used in the project
4Refer to the README file for specific instructions on replicating the core architecture using approximately 4,000 lines of code
5Explore the GitHub repository for additional resources, such as the TypeScript implementation

Ready-to-paste prompt

To start building the coding agent, begin with the first chapter of the tutorial and execute the command `python chapter1.py` to initiate the setup process

Heads up: Before starting, ensure you have a good understanding of Python and TypeScript, as well as the necessary dependencies installed, and be aware that the project involves working with a large codebase of approximately 4000 lines

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