wtf is apollo-tooling?

Apollo CLI is a command-line tool that helps teams keep their GraphQL apps in sync. If your frontend app asks the backend for data, this tool makes sure those requests are valid, safe, and correctly typed before they ever reach a user. It bridges the gap between the client side of your app and the server that provides its data. At a high level, the tool runs checks and generates code based on your GraphQL schema, which is essentially a contract describing what data the server can provide. For example, it can scan your app's code for data queries and verify them against the server's actual capabilities, catching errors like requesting a field that doesn't exist. It can also automatically generate TypeScript or Swift type definitions from those queries, so your app's code editor can catch mistakes as you type. Additionally, it handles uploading registered queries to Apollo's servers, enabling performance monitoring and a security safelist. This tool is built for developers and teams who are already using GraphQL to build their software. A concrete use case is a mobile app team building an iOS app with Swift. They would use this tool to generate the data models for their app's screens, ensuring the app doesn't crash from unexpected data shapes. Another example is a web team using TypeScript who wants to verify that a new frontend feature's data requests will work against the production server before deploying it. The tool is run from a terminal and installed via standard package managers. It connects to the Apollo platform using an API key to sync schema details and register operations. By handling tasks like query extraction and type generation automatically, it reduces the manual work of keeping frontend data models matched with backend services.