This project recovers the TypeScript source code of Anthropic’s Claude Code 2.1.88 from an accidentally published npm package source map. The claude code tool was uploaded to npm with its build artifacts including a 57MB source map file containing the original 700k lines of source code in the sourcesContent field. The project reconstructs and organizes this source to study Claude Code’s CLI architecture, command system, and MCP (Model Context Protocol) implementation.