(Alleged) Leaked source of Claude Code
docs: emphasize leaked source and include original tweet
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README.md
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README.md
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# Claude Code — Source Analysis
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# Claude Code — Leaked Source (2026-03-31)
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> **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.
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---
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## How It Leaked
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[Chaofan Shou (@Fried_rice)](https://x.com/Fried_rice) discovered the leak and posted it publicly:
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> An archive of [Anthropic](https://www.anthropic.com)'s official CLI tool **Claude Code** source code, for analysis and educational purposes.
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> **"Claude code source code has been leaked via a map file in their npm registry!"**
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> Reference: [Original tweet](https://x.com/Fried_rice/status/2038894956459290963)
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> — [@Fried_rice, March 31, 2026](https://x.com/Fried_rice/status/2038894956459290963)
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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.
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---
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## Overview
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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.
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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.
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This repository contains the `src/` directory extracted for study.
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This repository contains the leaked `src/` directory.
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- **Leaked on**: 2026-03-31
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- **Language**: TypeScript
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- **Runtime**: Bun
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- **Terminal UI**: React + [Ink](https://github.com/vadimdemedes/ink) (React for CLI)
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---
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## License
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## Disclaimer
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This repository is for analysis and educational purposes only. All original source code is copyrighted by [Anthropic](https://www.anthropic.com).
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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).