The lodging draft of the Universal Commerce Protocol (UCP), the standard Google says it will adopt "over the coming months" to power hotel booking in AI Mode, contains no fields for travel agencies, no commission structure and no vocabulary for group business terms such as attrition, allotments or rooming lists.

The draft was merged on September 24, 2026. Thirteen days earlier, a reviewer on the public proposal pointed out that the section describing who makes a reservation had no place for an agency: no agency name, no IATA number, no agent identifier. The lodging council's reply, delivered ten days later, classified those use cases as "out of scope" for now.

That answer deserves close attention from European intermediaries. Tour operators, travel management companies and traditional agencies — the businesses that live on commission and margin — have no permanent seat on the 16-seat technical council that wrote the draft. The council, announced on August 11, reserves twelve permanent seats: six for Google and one each for Amadeus, Booking.com, Expedia, Hilton, Marriott and Trip.com. Online agencies are at the table. Intermediaries that book on someone else's behalf are not.

What is missing from the specification?

A repository search in early October found the word "commission" in no file of the specification. It appears only in community threads and one issue, the earliest from January, asking where affiliates and referrals fit.

The protocol defines four actors:

• the platform
• the business
• the credential provider
• the payment service provider

An online travel agency fits as a business, because it sells. An intermediary booking for a client on commission or margin fits none of the four roles.

The gap extends to group business. Marriott's chief financial officer said on the company's fourth-quarter 2025 earnings call, in February 2026, that group is "in the ballpark of a quarter" of its room nights worldwide. The words "allotment", "attrition" and "rooming" appear nowhere in the repository.

How far does the draft actually reach?

The standard is not limited to single rooms. It allows several rooms per booking as repeated lines, separates the booker from the guests, lets the booker carry a company for invoicing and supports deposits with a later balance. Google, not the standard, says its first milestone covers one room, with more rooms as a possible "future extension".

The real constraint is time, not quantity. The draft models a purchase that opens and closes in one session. Inventory can be held softly until that session expires. Unless a payment-mandate extension is supported, the booking must be "finalized manually by the user". Once the session closes, the booking is immutable, and everything after purchase is left for later work.

A group contract inverts that model. Terms are negotiated outside any cart. Rooms are held for months. Guest names arrive weeks after signature. Unpicked rooms revert to the hotel at a cutoff date.

Where does the industry already draw the line?

The sector drew the boundary before AI agents arrived:

• Hilton's own site caps online group confirmation at "up to 25 guest rooms"; beyond that, planners must contact the hotel or submit a pricing request.
• Mirai, the Spanish booking-engine provider, added multi-room bookings to its conversational assistant in July 2026 and reports that from five or six rooms, requests start to count as group bookings — the assistant captures contact details and hands them to the hotel.
• Cvent's 2026 planner sourcing report, a survey of 1,650 planners run in July 2025, found three-quarters already use AI somewhere in venue sourcing.
• Apaleo's MCP server lets hotel staff work on blocks and groups through an assistant — but only for the hotel's side, not the buyer's.

When Cvent overhauled its room-block tool in July 2026, it called block management "one of the most friction-heavy parts" of group business. In groups, AI accelerates the paperwork. It does not close the sale.

Is the door still open?

Yes, formally. The same reply that said "out of scope" described agency fields as an additive, non-breaking change and invited follow-up proposals. An open issue from September notes the protocol has no defined way to bind terms agreed outside the cart, listing negotiated offers and contracted rates among examples. The lodging council reserves four seats for members "from any organization".

For hotels, the practical step is encoding group terms as data rather than PDF clauses: cutoff dates, attrition formulas, deposit schedules. For agencies, tour operators and their associations, the step is filing the next proposal. "Out of scope" will remain the answer until someone from the intermediary side shows up — and the four open council seats are the immediate venue for that.