That is the catch. The browser tab, the terminal, the desktop app, the MCP server: each one calls a model directly from the device. Nothing is routed, so nothing is logged. The paste of a customer list into a free chatbot never asks for permission, and your appliance never sees it leave.
Detection that stops at a tool name is a spreadsheet. Northbeams inspects what each tool touches, ties it to a person, and gives you a control you can actually pull.
A ban list does not remove shadow AI. It removes your view of it. Visibility lets you say yes on purpose: sanction the tools that help, coach the risky ones, and block the few that never belong.