When an agent books a hotel, who decides where the booking lands?
Google has confirmed that hotel booking will be one of the next verticals for its Universal Commerce Protocol. A search user will be able to find and book a room inside AI Mode or Gemini without visiting a booking site. The detailed lodging specification has not been published yet, so this is not a question about how it works but about how it should work, while the standard is still open.
The pilot includes both OTAs and chains. Take a Marriott hotel that is bookable through Marriott directly and through Booking.com. Both are in the pilot. A user asks the agent for a room and that hotel is a match. Which connection fulfils the booking? Whoever it is fulfilled through stays the merchant of record and keeps the guest relationship, so this is not a plumbing detail. It decides distribution. Google has said nothing about the routing logic, and that silence is the story.
There is already a hint of how Google works here. Its agentic restaurant booking, live for months, surfaces a curated list and sends the user to a named partner such as OpenTable or Resy to finalise. If hotels follow that pattern, the question is not whether the user chooses, but which partners the agent surfaces and in what order.
So the question for the industry is this:
Should the agent present all available offers and let rate, conditions, and user context decide in the open — or will an invisible routing rule set by Google quietly determine the outcome before the user ever sees a choice?