On Ag your county will most likely check on it each year to make sure you are in compliance either wife live drive by or google maps (they do this for sure in Williamson County.) I did not want to run cattle or cut hay on my place so I converted to Wildlife. They will never come monitor you - simply turn in your wildlife info once a year - I take pics of bird houses, any trapper coons or possums, fish stocking, drainage work, brush removal, etc. Pretty simple.
Yeah, different process than we had to do in our county. Yes, submitted pics, but also had to submit a new application each year with planned activities, along with a letter detailing accomplished activities from previous year, receipts for wildlife related activities, etc. I probably provided too much, but wanted to be by the letter, so stressed a bit more on it than was probably necessary. I was never denied and got no negative feedback from the county on any submittal - just kind of a pain.
Funny thing too, there are properties in my area that have Ag valuations, and I KNOW they are doing no Ag related activities. My assumption was that the county would drive by on occasion to check/audit, but (to my knowledge) none have never gotten dinged. I could see the county not making a fuss for a year or two, since the rules require activity for 5 of 7 years, but I've been out in the area for 6 and have never seen any Ag related activities on several of these properties.