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Some sessions are with a person, for example working a decision through together. These tools show what is on offer, keep the time you pick while you pay, book it on the host’s calendar, and move or cancel it. You do not call these tools yourself. You ask your AI in plain words, and it picks the tool. This page shows what each one does, so you know what to ask for.

Sessions I can book with a person

session_offers · Changes things Sessions with a person this account can buy or already bought (for example working a decision through in person): each with its price, hours, place, whether it is bought, sessions left to book, and upcoming booked times with their change link. not_interested (optional, bookable ids) stops Trillion from mentioning those sessions again. Inputs
Example

Open times for a session

open_session_times · Reads only Open times for a session, soonest first: each with start (pass it to book_session_time) and when (in the host’s timezone). Anyone can look; booking needs the session bought. Inputs
Example

Pick a time and get the checkout for a session

buy_session · Changes things Buying a session (bookable_id from session_offers; the first one when left out). With start (from open_session_times, the time the person picked), that time is kept for them while they pay and the checkout link is returned; paying books it and sends the invitation. Without start, returns the page where the person picks a time and pays. Nothing is charged until they confirm on the checkout page. Inputs
Example

Book a session time

book_session_time · Changes things Books one open time for a bought session: start from open_session_times, and optionally case_id, the decision it is about, and the person’s name and time_zone (an IANA zone such as Europe/London) for the invitation. Puts it on the host’s calendar with the person invited and emails both. Returns the booking with its change link. Inputs
Example

Move or cancel a session

change_session · Changes things and can remove them Moves a booked session to another open time (start) or cancels it (cancel: true), by the change link the booking returned. Both people are told, and the calendar follows. Inputs
Example
Last modified on October 1, 2026