# Claude Code Leak Reveals Anthropic Built a Tool That Watches Users While Hiding Its Own Presence

- slug: claude-code-leak-reveals-anthropic-built-a-tool-that-watches-users-while-hiding-its-own-presence
- date: 2026-04-04
- category: Artificial Intelligence

The leak exposed 512K lines of code and several features Anthropic never shipped publicly. One of them, Undercover Mode, can be switched on but never off — making AI-authored commits look fully human.

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