An interface schema specifies which components can appear, the data each component accepts, how components may be nested, and which values or actions are valid. Software can use it to check a generated description before any interface reaches a user.
Schemas make generative interface output easier to validate, version, test, and render across platforms. They cannot define every quality judgment, so teams still need design constraints, representative requests, accessibility review, and safe handling for invalid output.
ELI5
An interface schema is a rulebook for describing a screen in structured data. It tells the system which building blocks exist and how they may fit together.
For example, a schema can say that a form contains labeled fields and one or more approved actions, but that a chart cannot be placed where an action is required. The application rejects descriptions that break those rules.
