A martini with agave in the gin's place, and bianco vermouth rather than dry, which keeps a little sweetness under the herbs. Two and a half ounces of blanco with almost nothing to hide behind: this is a bottle test in a stemmed glass.
Stirred is the default: it stays clear and keeps the vermouth's weight. A hard shake makes it colder, brighter and slightly cloudy, which suits a warm afternoon but flattens the vermouth. Both are correct; they are not the same drink.