Anthropic Accidentally Exposes Claude Code Source via npm Source Map File



Posted on Tue Apr 7 2026 | 1:30 pm


Anthropic's Claude Code CLI had its full TypeScript source exposed after a source map file was accidentally included in version 2.1.88 of its npm package. The 512,000-line codebase was archived to GitHub within hours. Anthropic called it a packaging error caused by human error. The leak revealed unreleased features, internal model codenames, and multi-agent orchestration architecture.




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