Anthropic accidentally leaked the source code of its Claude Code tool, after a large debug file was included in a public npm release. A 59.8 MB JavaScript source map file (.map), intended for internal debugging, was inadvertently included in version 2.1.88 of the @anthropic-ai/claude-code package on the public npm registry pushed live on March 31, 2026.
The file exposed 1,900 TypeScript files, consisting of more than 512,000 lines of code, full libraries of slash commands and built-in tools. Once flagged online, the code was quickly shared and analyzed by developers.
The leaked source reveals a sophisticated, three-layer memory architecture that moves away from traditional “store-everything” retrieval.
Read more about it here.