Capping a tooth is decided by the size of the tooth , its relation with the opposing tooth and it's functionality.
Wisdom tooth usually doesn't function in chewing, and if you are not having any food lodgement or discomfort you can avoid capping, the tooth is already saved.
Next Steps
if it's chipping off or food lodgement is there, then get it clinically checked and let the dentist decide about the pros and cons
Health Tips
you can floss and avoid chewing hard on the same side. capping is an accessory, though extremely important for root canal treated teeth that are in function, but not a necessity if situation is favourable.