You can add coffee grounds to a compost pile but we would not suggest adding them to a planting hole directly. Eggshells will not provide much in the way of calcium or other plant-available nutrients unless they are crushed into a fine powder and allowed to compost. Instead, the only amendment that might be needed, if any, would be finished compost. A laboratory soil test of a veggie bed can reveal its organic matter content (which compost will improve over time), acidity (pH), and basic nutrient levels.

Miri