Build your own Claude Code from scratch. 🔍 Claude Code is open-sourced with 500,000 lines of code—too much to read? Reimplement its core architecture from scratch in ~5,000 lines of TypeScript/Python, with an 11-chapter step-by-step tutorial to help you understand the essence of coding agents.
Claude Code From Scratch is a step-by-step learning project that recreates the core architecture of a coding agent in roughly 5,000 lines of TypeScript and Python. It is for developers who want to understand how coding agents work without reading a much larger codebase.
This repository also configures its own agents. See what claude-code-from-scratch tells them →
Windy3f3f3f3f/claude-code-from-scratch
MCP server Claude CodeCodexCursor +2
MCP server "test" as configured in Windy3f3f3f3f/claude-code-from-scratch. Runs test/mcp-server.cjs with node.