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Published on 02.04.2026
TLDR: On March 31, 2026, a debugging artifact accidentally included in Claude Code version 2.1.88 exposed 512,000 lines of TypeScript source to the public. The leak revealed unreleased features, internal model codenames, an "Undercover Mode," and anti-distillation mechanisms — and set off a cascading wave of DMCA takedowns, community analysis, and legal debate about AI copyright.