Agave Plant Bugs
Agave Plant Bugs Agaveocoris barberi
AKA Running Bugs
This insect was formerly known as Caulotops barberi (changed in 2020) and was often just called "caulotops".
Running Bugs are tiny and hard to see (adult size is about 1/8"). They run and hide quickly when they're approached. They suck the sap from succulent leaves. This leaves light yellow or tan scars at the site of feeding.
Neem Oil works great on them! I'd spray nearby succulents too, just in case they're hiding in there.
The spots are permanent and depending on the plant, it may take years to produce enough leaves to replace the damaged ones. Check your plants regularly to prevent severe damage or even plant death!