BubbleIQ makes it easy to tag a coworker from a Zendesk ticket and have them get immediately notified in a Slack thread.
It's super simple, just put the person's slack username with an @ sign in front of it in the comment in Zendesk.
Assuming you've already set up that ticket to send into Slack, we automagically transform it into the special JSON that Slack is looking for to tag them in the message.
That's it! Your coworker will be notified in Zendesk. You can even automate the addition of a comment via a Trigger: https://support.zendesk.com/hc/en-us/community/posts/203164973-Adding-Comments-via-Triggers-and-Automations