DIVING INTO CLAUDE CODE'S SOURCE CODE LEAK

Summary from the TLDR Dev newsletter

On March 31, Anthropic accidentally leaked the full source code for Claude Code via a .map sourcemap file in an npm update, which was quickly mirrored and analyzed. This led to rapid "clean-room" rewrites in other languages to prevent legal troubles. The leak revealed unannounced features like KAIROS, a proactive 24/7 autonomous agent, Claude Code's memory architecture, and anti-distillation mechanisms designed to poison competitor training data.