Claude projects silently enable account memory sharing, breaking promised isolation

bcRIPster · reddit · 2026-09-28

A Redditor discovered Anthropic quietly added a "Use account memory" toggle inside every Claude project, default-on for existing projects — bridging project memory with account-level memory. They found real cross-contamination (fiction character names mixed with job-search and research material) and spent an hour cleaning up. Anthropic's help docs still claim project memory is isolated, and the toggle apparently shipped with the Sept 16-17 platform unification without any announcement. The author urges lawyers, consultants, and researchers using projects for isolation to check settings and turn it off, and has filed formal feedback.

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