Anthropic’s Claude Code secretly logged users time zone data

Anthropic's Claude Code was found to have a hidden tracking marker embedded within its code, which was described as an "experiment" aimed at preventing account abuse from unauthorized resellers and understanding Chinese distillation attacks. The marker covertly encoded traffic data depending on users’ time zones, particularly affecting those in Asia. Upon the discovery, Anthropic quickly removed the feature but has yet to publish a detailed explanation. This incident underscores the importance of understanding the operational risks associated with AI coding assistants for developers.