Parāshara Samhita gives us a very special mantra of hanuman called sundari prathama mantra, which is a collection of names, though it is a collection of hymns it is not just a hymn but also counted as a single mantra.
Since it is a collection of 27 names and does not openly contain any beeja mantras, it can be chanted by everyone. Hence this book is an effort to comment on those particular names and explain them backed by the sacred text parāshara Samhita and other sacred scriptures.