Whisk dry ingredients and set aside. Melt chocolate and add espresso and mix well. Add melted butter and vanilla and mix well. Add agave and stir until well-blended. Add egg and mix well. Combine wet with dry ingredients until well-blended. Fold in chips and cacao nibs. Drop by tablespoons on greased cookie sheet and top with smoked sea salt (optional). Bake at 350 degrees for 10 minutes.