Anthropic, the flagship AI company, has inadvertently exposed the source code for its major CLI tool Claude Code. It has already been extracted with mirrors published on GitHub. Chaofan Shou announced the discovery on X. “Claude Code source code has been leaked via a map file in their npm registry!” the user posted.

A routine software update for Anthropic's Claude Code tool accidentally leaked its entire source code, sparking rapid community response.

While Anthropic insists no sensitive user data was compromised, the leak has sparked intense interest across the developer community and raised fresh questions about operational security.