Do not paraphrase the summary of an operation in its description. It gives the reader a false promise to document the operation, while it adds no value. Don't provide a detailed description if the summary is sufficient to understand the operation.

Noncompliant Code Example (OpenAPI 2)

swagger: "2.0"
info:
  version: 1.0.0
  title: Swagger Petstore
paths:
  /pets:
    get:
      summary: list all pets
      # Noncompliant: Description must differ from summary..
      description: List all pets
      responses:
        default:
          description: the default response

Compliant Solution (OpenAPI 2)

swagger: "2.0"
info:
  version: 1.0.0
  title: Swagger Petstore
paths:
  /pets:
    get:
      summary: list all pets
      description: Get all defined pets. The API can be paginated by the client, but the server is allowed to restrict
                   the number of returned results further than what the client has requested.
      responses:
        default:
          description: the default response