Deer fencing separates our small backyard patio/garden from the chicken side of the yard. The pop-up canopies are setup on the chicken side while the people side has patio roofs.
During young vegetable growing season our chickens (only 6) are kept out of the raised garden beds. We use bird netting to keep out wild birds as well as our hens.
But our deer fence gate was left open and the hens wandered into the garden area. One of the raised beds wasn't secure with the bird netting and the hens had a great time decimating our small cucumber plants! They didn't eat the green weeds but flattened our cucumber plants!
As for composting we don't do deep litter method. As DH cleans out the coop poop he just tosses it directly into the garden beds (we have only 6 hens). After harvesting the garden beds and the exhausted plants die, we turn the hens loose in the beds for most of the winter where they dust bathe and leave their poop for fertilizer and eat spiders and their favorite treat - crickets!
When our cottage and our back & front yards got remodeled we planned to have a few chickens for eggs/pets. So no toxic or poisonous foliage was planted. The vegetables were hot and sweet peppers, various herbs, sweet potato, tomatoes, cucumbers, squash, and one year we tried cantaloupe (took too much growing space!).
P.S. We got a kick out of the Chicken Tunnel man video!