Claude Numbat

Claude Code Source Code Leaked, Revealing Architecture and Unreleased Features

Anthropic's Claude Code version 2.1.88 accidentally included a source map file that allowed decoding of over 512,000 lines of closed-source code across 1,900 files, which was published widely before Anthropic removed the package. Analysis of the leaked code reveals Claude Code's architecture as a modular, OS-like agent system with swarm subagents, a three-tier memory structure, and multi-stage context compression. The leak also exposed unreleased features including an always-on background agent called Kairos with a memory-pruning subsystem called autoDream, a voice interface, an 'undercover mode' for stealth git commits, and references to unreleased models codenamed Capybara and Numbat. Anthropic confirmed the leak was a packaging error and not a security breach, with no user data exposed.