CHOOSE blocks
Dynamic options (fixed 2026-09-02): when the options are only known mid-walk, include choose_config in the outcome filing payload. The platform writes it to the step before opening the ask.
A CHOOSE step must offer a real choice control (REJ-24). Choice controls carry minimum real-option counts (REJ-25): the renderer's automatic “Other (type in)” never counts as an option, and an agent may not add its own __other__ sentinel.
single_choice
answers CHOOSE One pick from the agent's options. The renderer appends “Other (type in)” automatically.
Choose your free stay strategy
Here are ways to stay in Tokyo for free using points or certificates. Which appeals to you?
Rules Minimum 2 real options (REJ-25).
multiple_choice
answers CHOOSE Any number of picks.
Which channels should the campaign use?
Pick every channel you want in scope.
Rules Minimum 3 real options (REJ-25).
rank
answers CHOOSE Person orders the options; the full ranking comes back.
Rank these logo directions
Drag your favorite to the top.
Rules Minimum 3 real options (REJ-25).
yes_no
answers CHOOSE or PROVIDE Binary question with two fixed platform buttons. The agent supplies no options, so the min-options rule never fires. Added 2026-08-28; also the ONLY control that may close a FINISH.
Should I book the earlier flight?
Same price, departs 7am instead of 11am.
Rules No agent options; exempt from REJ-25.