Task: The technical details page[1] for mentions lists a restriction for mentions that is likely to produce mention errors:

• the comment, in which the mention occured, contains level 1 or 2 section headers elsewhere than at the start

Questions to answer:

• What would be the consequences of lifting the condition? How could we do that?
• If we can't lift it, could we inform users about mentions that are not being sent out due to it?

Goal: We want to reduce the sources of mention failures. If that is not possible, let's try to at least give an error message in form of a mention failure notification.

Background: This task is based on a wish that received 21 points (#9) in the German Community Wishlist[1]. Originally, the wish was to receive an information about the sent messages. To keep the number of notifications smaller, and to help people use mentions in a way that they are sent, the task informs about mention failures, and adds the reasons for the failure as well.

[1] Link to wish (in German): https://de.wikipedia.org/wiki/Wikipedia:Umfragen/Technische_W%C3%BCnsche_2015/Topw%C3%BCnsche#Bei_Speichern_Hinweis_.C3.BCber_abgegebene_Benachrichtigungen_.5BUmfrage_2015.5D
in English: https://meta.wikimedia.org/wiki/WMDE_Technical_Wishes#Notifications_about_failed_mentions