Won't hurt anything, although the beans may take a long time to actually break down. OTOH they are so small they shouldn't be a bother in the final product.

fritz, just coffee grounds? No prob! Nancy

The nutrients in coffee grounds about 2 -.6 -.6 with a pH around 6.2. Use them in either place.

Here is a link that might be useful: nutrients in coffee grounds

this is ground unused coffee beans as they are stale.
just wanted to clarify

Ground is better anyway. :-]

I'd just put them in the compost, just as I do with used coffee grounds. They will be a nice mix-in for your pile.

Here is a link that might be useful: composting how-to article