Having a detailed description as part of the OpenAPI info object helps describe what a collection of paths and operations does for consumers, providing a short, concise, and relevant couple of paragraphs about the value that is represented as the OpenAPI
OpenAPI Info Description Error
Message: Info MUST Have Description
Policies
Description of APIs
The description in your OpenAPI info block is prime real estate. This is where you tell consumers what the API is about in a way that makes them want to keep reading.