The AI Companion plugin adds an in-note AI assistant that can be summoned instantly using a simple slash command. It allows users to ask questions, get written responses, and pull content from existing notes to shape more relevant answers. Context handling is central here. You can attach one or more pages before asking, which makes the output grounded in your own material instead of generic text. Responses are not locked inside a modal either; they can be inserted straight into the current note with a single action, keeping the writing flow intact. The plugin relies on OpenAI's language models, so behaviour and quality are consistent with that ecosystem.