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docs: emphasize leaked source and include original tweet

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2026-03-31 02:00:52 -07:00
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# Claude Code — Source Analysis
# Claude Code — Leaked Source (2026-03-31)
> An archive of [Anthropic](https://www.anthropic.com)'s official CLI tool **Claude Code** source code, for analysis and educational purposes.
> **On March 31, 2026, the full source code of Anthropic's Claude Code CLI was leaked** via a `.map` file exposed in their npm registry.
---
## How It Leaked
[Chaofan Shou (@Fried_rice)](https://x.com/Fried_rice) discovered the leak and posted it publicly:
> **"Claude code source code has been leaked via a map file in their npm registry!"**
>
> Reference: [Original tweet](https://x.com/Fried_rice/status/2038894956459290963)
> — [@Fried_rice, March 31, 2026](https://x.com/Fried_rice/status/2038894956459290963)
The source map file in the published npm package contained a reference to the full, unobfuscated TypeScript source, which was downloadable as a zip archive from Anthropic's R2 storage bucket.
---
## Overview
Claude Code is a CLI tool that lets you interact with Claude directly from the terminal to perform software engineering tasks — editing files, running commands, searching codebases, managing git workflows, and more.
Claude Code is Anthropic's official CLI tool that lets you interact with Claude directly from the terminal to perform software engineering tasks — editing files, running commands, searching codebases, managing git workflows, and more.
This repository contains the `src/` directory extracted for study.
This repository contains the leaked `src/` directory.
- **Leaked on**: 2026-03-31
- **Language**: TypeScript
- **Runtime**: Bun
- **Terminal UI**: React + [Ink](https://github.com/vadimdemedes/ink) (React for CLI)
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## License
## Disclaimer
This repository is for analysis and educational purposes only. All original source code is copyrighted by [Anthropic](https://www.anthropic.com).
This repository archives source code that was leaked from Anthropic's npm registry on **2026-03-31**. All original source code is the property of [Anthropic](https://www.anthropic.com).