Yeah, "tags" seems more like a narrative idea, best suited for foreground growth. You may check Block, Dodge, Parry to see how it can be implemented in Cairn hack. Some of those are more like modifiers, but some are really interesting:
https://lars1808.github.io/Block-Dodge-Parry-SRD/careers-and-skills
Foreground Growth is exactly how I think of them, too. Like learning how to hotwire a speeder, or picking up some computer hacking skills, those are sort of fictional permissions you either have or don't. Then you can simply do those things, given the right circumstances and tools, and it's simply a matter of introducing an appropriate Save whenever risk or danger is involved.
