Tasks description can have important information for the execution. However, not all tasks need description. That leads to cases, where users do not open the task details to explore their description.

I see a high value, when there would be an indicator for each task in lists or cards, that indicates that the task has a description. The user then would know, that there is some more information in the details. This is similar to comments, there the speach-mark indicates, that there is a comment.

An exciter to this feature would be, if the text of the description would be displayed in a tool-top, when the mouse hovers over the task title for a while.