How detailed should a user story be?
A user story should be written with the minimum amount of detail necessary to fully encapsulate the value that the feature is meant to deliver. Any specifications that have arisen out of conversations with the business thus far can be recorded as part of the acceptance criteria.
How do you write a description in a user story?
User stories are often expressed in a simple sentence, structured as follows: “As a [persona], I [want to], [so that].” Breaking this down: "As a [persona]": Who are we building this for?