Google Tests Personal Intelligence in NotebookLM With Personas and Per-Notebook Controls

Leaked test builds point to editable personas with account- or notebook-level settings, with no announced rollout.

Overview

Code findings surfaced by TestingCatalog and corroborated by tech outlets indicate Google is experimenting with Personal Intelligence inside NotebookLM.
The feature is designed to learn from past chats and notes so the assistant can remember goals, tone, and preferences across projects.
Controls appear in both global settings and individual notebook configurations, allowing different projects to use different profiles.
Test builds show a custom prompt field that pre-fills a persona-style description which users could edit to fine-tune behavior.
Reports describe a self-contained approach that relies on in-app history, unlike Gemini’s version that can draw from Gmail, Photos, and YouTube, and there is no release date.