Claude Code's Entire Source Code Was Just Leaked via npm Source Maps — Here's What's Inside
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A security researcher discovered Anthropic's full CLI source code exposed through a source map file. 1,900 files. 512,000+ lines. Everything. If you work with AI-powered coding tools, today is one of those days you'll remember. On March 31, 2026, security researcher Chaofan Shou (@shoucccc) discovered that Anthropic's Claude Code — their flagship agentic CLI tool — had its entire source code exposed through a source map file published to the npm registry. The leaked codebase was quickly archiv