GraphQL Federation Skill

Create correct GraphQL federation subgraphs following WunderGraph Cosmo composition rules.

Core Concepts

Subgraph: A GraphQL microservice contributing to the federated graph. Federated Graph/Supergraph: The composed GraphQL interface for clients. Router: Plans operations, routes requests to subgraphs, joins data. Entity: A type with @key directive resolvable across subgraphs. Router Schema vs Client Schema: Router sees all fields; clients don't see @inaccessible items.

Essential Directives

@key - Define Entities