In response to a developer's question, Gemini answered in a way that indicated it was aware of having used a tool called "Alembic" in the past.
Users Point Out Google Gemini's Internal Instructions to Hide Use of Past Data
This article is a translation. Read the Japanese original
However, upon checking the "Show thought process" feature, it was revealed that Gemini had been internally instructed not to disclose the existence of the "Personal Context" feature.
Users have raised questions regarding the decision to conceal this through deception, arguing that it violates the privacy policy.
Source: I caught Google Gemini using my data and then covering it up（HN 314pt・78コメント） (HN Search (backfill), 2025-11-18)