Typo in the subject. I meant Worm not Work

Looks like tomato fruitworm or cutworm. If you look closely you may be able to see lacey holes around the leaf edges and find them and squish them sooner before they get bigger and eat the maters. You can also try bti (bacillus thuringiensis Israelensis) as a larvacide to kill them in the soil before they mature as they are a moth larvae.

I have never seen any caterpillar to eat tomato or potato leaves. ..they love parsley..hehe

I use a BT spray to prevent them but I usually start spraying the leaves and fruit once a week as soon as the plants start setting fruit. The only problem is that the worms have to ingest the BT so they still might bite your tomatoes before they die--I haven't tried using the BT after they are already infested with worms so I'm not sure how well it would work.