The original title is: "Anthropic hid tracking signals in Unicode apostrophes. That's not telemetry, that's steganography."

Short summary

Claude Code embeds hidden Unicode tracking signals in system prompts to fingerprint user behavior and detect routing patterns without disclosure. The author frames this steganography as a trust violation for a root-level tool and a dangerous precedent for covert monitoring in developer tools. Full transparency about markers, triggers, and consequences is needed to restore trust.

• •Claude Code reportedly uses invisible Unicode markers in prompts to detect usage patterns like API routing to competitors
• •This steganography—not disclosed telemetry—violates the trust bar for tools with shell and filesystem access
• •Author demands full transparency about what's monitored, how detection triggers actions, and consequences

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