You always need to balance green and brown, if you have no other sources of nitrogen, best lay the coffee down, the leaves breaking down will soak it up, I doubt much will be available till it all breaks down. Tomatoes are pretty heavy feeders in my experience.
Compost alone is not really a fertilizer, more a soil amendment. I always add organic fertilizer to compost. So adding coffee grounds is adding organic fertilizer. I myself would add more anyway. Not like coffee is a super source of nitrogen.
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