Use when working with Apollo Federation 2, Apollo Server v4 subgraphs, Apollo Router, the Rover CLI, or GraphOS/Apollo Studio — composing, running, testing, publishing, or operating a federated GraphQL graph on the Apollo vendor stack. Delegates vendor-neutral GraphQL schema/resolver/authorization/testing design to graphql-api and covers only Apollo-specific mechanics: Federation 2 directives and entities, Apollo Server v4 subgraph implementation, Apollo Router local config/CORS, Rover check/compose/publish workflows, GraphOS graph refs and Studio, CI composition gates, and secret-safe APOLLO_KEY/APOLLO_GRAPH_REF handling.
