Manjusri Namasamgiti is kind of a special case, according to Jamgon Kongtrul.
This tantra can be explained from the point of view of Yoga Tantra, and also from the framework of Highest Yoga Tantra. there are Indian commentaries from both positions, and also commentaries that approach this tantra from a Dzokchen point of view, apparently.
It's usually classified as a Father Tantra of the Delusion Class.
In general, Manjusri practice is said to benefit learning, study, etc.--what we might call "Mundane Siddhi."
This particular Tantra is concerned with Ultimate Siddhi, primarily.
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