GraphQL schema decorators are a proposal that aims to provide a standardized and modular way to add features to GraphQL schemas. They enable developers to add annotations, metadata, and behavior to different parts of their schema using reusable modules, making it easier to build and maintain complex GraphQL applications. The goal is to achieve flexibility, well-specified semantics, introspectability, self-containment, and portability across programming languages and implementations. Schema decorators share similarities with GraphQL directives but differ in application scope, implementation, and behavior. They can be used to add features such as authorization checks, argument validation, logging, error handling, and more to the schema, making it easier to build complex and maintainable GraphQL applications.