Claude Code Source Code Leak

Claude Code Source Snapshot for Security Research

This repository mirrors a **publicly exposed Claude Code source snapshot** that became accessible on **March 31, 2026** through a source map exposure in the npm distribution. It is maintained for **educational, defensive security research, and software supply-chain analysis**.

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Research Context

This repository is maintained by a **university student** studying:

• software supply-chain exposure and build artifact leaks
• secure software engineering practices
• agentic developer tooling architecture
• defensive analysis of real-world CLI systems

This archive is intended to support:

• educational study
• security research practice
• architecture review
• discussion of packaging and release-process failures

It does **not** claim ownership of the original code, and it should not be interpreted as an official Anthropic repository.

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How the Public Snapshot Became Accessible

[Chaofan Shou (@Fried_rice)](https://x.com/Fried_rice) publicly noted that Claude Code source material was reachable through a `.map` file exposed in the npm package:

**"Claude code source code has been leaked via a map file in their npm registry!"**

— [@Fried_rice, March 31, 2026](https://x.com/Fried_rice/status/2038894956459290963)

The published source map referenced unobfuscated TypeScript sources hosted in Anthropic's R2 storage bucket, which made the `src/` snapshot publicly downloadable.

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Repository Scope

Claude Code is Anthropic's CLI for interacting with Claude from the terminal to perform software engineering tasks such as editing files, running commands, searching codebases, and coordinating workflows.

This repository contains a mirrored `src/` snapshot for research and analysis.

• Public exposure identified on: 2026-03-31
• Language: TypeScript
• Runtime: Bun
• Terminal UI: React + Ink
• Scale: ~1,900 files, 512,000+ lines of code

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