Google Launches Notebooks in Gemini, Synced With NotebookLM

This looks like a productivity feature. It is actually a context moat. The problem with every AI tool today is that your context resets every session. You lose the thread. Google is solving this by making Gemini remember your project state, your files, your instructions — and syncing it across two surfaces. For AI workers who live in these tools, that is a genuine workflow upgrade. But here is the deeper play: once your project context lives inside Gemini Notebooks, switching to Claude or ChatGPT means losing all of that accumulated structure. Google is not just building a feature. They are building the switching cost that AI tools have lacked. Product managers evaluating AI platforms should pay attention — the competitive advantage is shifting from "which model is smartest" to "which tool knows my work best." Context persistence is the new battleground.