Enforce schema consistency across federated graphs with GraphOS by adding composition rules to the Apollo GraphOS linter, which can be configured to flag inconsistent elements, overridden or unused elements, and issues with Federation directives. Composition rules are enforced by the GraphOS linter checks workflow, which can be integrated into CI/CD pipelines and the GraphOS registry for centralized enforcement. To get started, users can access the Checks Configuration page in GraphOS Studio or follow a step-by-step setup guide. With composition rules enabled, API platform teams can ensure that their schema stays consistent across multiple subgraphs.