Short answer
HubSpot's KB describes Breeze Assistant as its conversational AI for generating content, summarizing records, preparing for meetings and completing tasks. In my demo portal the panel offers Summarize, Create, How do I and Meetings, plus suggested prompts and an @mention box. Projects keep context and reference material, and also carry over to the mobile app.
1. The panel
My demo portal, panel open.

2. Control what it can see
See AI access settings and AI context.