The document discusses building an API utility belt by introducing several tools for working with APIs. It assumes the reader has a technical background and uses APIs regularly. Seven tools are described: Curl for making requests but with complexity; Postman for a point-and-click interface; BDD IRL for behavior-driven development testing; Fiddler as a local proxy for debugging; ApiTools for local or cloud-based logging and analysis; Stoplight.io for documentation generation and collaboration; and Runscope for monitoring, testing, and easy request sharing. Each tool is introduced with its background and common functionality.