It should be fine for planting into Sharon, but does sound quite ‘fresh’ if there are still mushrooms growing in it, so a half inch layer of fine compost on top would help small seeds settle without disappearing between larger pieces. Also before planting I would firm it down with a plank or board on top which you push down with your feet, even walk on. You may then find your beds look less full and they will benefit from a top-up layer every winter.
It is one of the main differences in no dig growing, with compost on top rather than incorporated, that one is sometimes sowing and plnating into a less fine-looking medium. Yet seedlings have always thrived on my beds, even if sometimes a little buried-looking at first. Early sowings and plantings often benefit from fleece to protect from wind and this also helps them establish without blackbirds kicking compost over them. Below is a pic of some recent plantings here which I then covered with fleece. pieces of straw on the surface are in home-made compost and plants are peas, spinach, beetroot and lettuce.
