On Monday, someone at Anthropic forgot to exclude a single file from a software package. That mistake exposed the complete source code for Claude Code — and revealed that the company is quietly building an always-on autonomous agent called KAIROS. This is the second Anthropic leak in five days.

Sources:

• Alex Kim — The Claude Code Source Leak
• The Hacker News — Claude Code Source Leaked via npm
• WSJ — Anthropic Races to Contain Leak
• WaveSpeed AI — BUDDY, KAIROS & Hidden Features
• Straiker — With Great Agency Comes Great Responsibility
• Fortune — Anthropic Mythos leak
• 36kr — Karpathy validates KAIROS

Companion blog: The Harness: What Was Actually in the Leak

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