On March 31, 2026, a single misplaced file inside an npm package update exposed approximately 512,000 lines of TypeScript code — and with it, some of the most controversial internal design decisions Anthropic had ever made. The Anthropic Claude Code
A single debugging file left in a production build. That was all it took for Anthropic — one of the world’s most secretive and well-funded AI labs — to accidentally hand the global developer community a window into the internal