Choose a control flow

Use control flow when the answer needs more than independent fields: one choice determines another, application facts restrict the available options, or the same decision repeats across a list.

What you need	Guide
Apply a rule when an output field has a particular value	Conditional outputs: if, then and else
Restrict a choice using facts supplied by your application	Conditions using state
Choose the first matching branch from several cases	Switches
Repeat a result structure for each item in a supplied list	For-each loops

Conditions and switches constrain generated values. State conditions read facts supplied with the request. Loops build one result per supplied item, with its own fields and decisions.

if, then and else are standard JSON Schema keywords. Eligibility rules, switches and loops are Struct extensions under x-runtime; a standard JSON Schema validator alone does not enforce them.

If state is new to you, start with supplying application state. Every guide below also includes a complete, independent example.

These rules shape the answer; they do not execute the actions it names. Your application decides what to do with the returned result.