Change 522019 had a related patch set uploaded (by Samwilson; owner: Samwilson):
[mediawiki/core@master] Add change-tags to MessagePoster

https://gerrit.wikimedia.org/r/522019

Moving this task to External for Growth-Team , I know Community-Tech is working on PageCuration

Change 522019 merged by jenkins-bot:
[mediawiki/core@master] Add change-tags to MessagePoster

https://gerrit.wikimedia.org/r/522019

Using MessagePoster I was allowed to add a tags parameter to api.php?action=edit, which tags the edit (like so). The other POST parameters were the same as before. The parameter is optional; without it the POST is the same as before.

Example code:

msgProm = mw.messagePoster.factory.create(
					new mw.Title(
						"User_talk:Drwpb"
					)
				);
msgProm.then(function ( messagePoster ) {
					return messagePoster.post(
						"Subject",
						"Body",
                                                {"tags": "pagetriage"}
					)})