Anthropic's Claude Code found embedding hidden Unicode markers in system prompts

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Anthropic's AI coding tool Claude Code was found to embed covert tracking signals within its own system prompts using Unicode apostrophe variations and subtle date format changes. These hidden markers, a form of steganography, were reportedly triggered under specific conditions such as routing requests through rival AI providers or using a Chinese timezone. Unlike standard telemetry, the signals were invisible during normal use and could only be detected through byte-level inspection of raw prompt content. The concern is heightened because Claude Code operates with shell and filesystem access on users' machines, placing it in a higher trust category than typical applications. Critics argue the deliberate concealment of these markers — rather than disclosing them transparently — sets a troubling precedent for covert tracking in AI developer tools.

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