Shāstra Pramāṇa is the scriptural evidence, the direct, ultimate authority on the Truth as it is, for it is directly from Sadashiva, the AdiGuru (original Guru), the Source of all that is.
In Sanatana Hindu Dharma, Veda-Agamas are the irrefutable Shāstra Pramāṇa. All knowledge currents, philosias, rituals and lifestyle systems, and Yogic sciences for humanity are in-depth systematically revealed in Veda-Agamas form the pramanas.
आचारकथना द यग त ाि त नदानतः । महा मत वकथनादागमः क थतः ये ॥ ४३ ॥
ācārakathanāddivyagati prāptinidānataḥ । mahātmatattvakathanād-āgamaḥ kathitaḥ priye ॥ 43 ॥
Because it narrates of the sources of conduct, ācāra, with a view to arrive at the ultimate divine space, divyagati, because it speaks of the truth of the great-souled, mahātma, it is called Āgama.
वे दताऽ खलशा ाथ स धमा थ न पणात ् । दशन ानां माण वा वेद इ य मधीयते ॥ ३७ ॥
veditā'khilaśāstrārtha saddharmārthanirūpaṇāt । darśanānāṃ pramāṇatvādveda ityamidhīyate ॥ 37 ॥
Because it determines the purport of all the communicated, vedita, scriptures and of the sacred Dharma, and because it is the standard direct evidence of all philosias, darśanas , it is called Veda.
~ kulārnava tantra, ullāsa 17, Sadāśiva to Devi
आगतां शवव े यो गतां च ग रजा तु ौ । मतां ीवासदु ेव य त मादागम उ यते ॥
āgatāṃ śivavaktrebhyo gataṃ ca girijāmukhe । mataṃ hi vāsudevasya tasmādāgama ucyate ॥ ~ svacchanda tantra
“That which has come from Śiva’s mouth and directly heard and received by Devi Girijā (Pārvati), which has been ordained by Śri Vāsudeva (Viṣṇu) to govern the world, therefore that is called Āgama.”
The VedaAgamas are the Source books of Hinduism or Sanatana Hindu Dharma. The revelation from the Veda-Agamas form the Shāstra Pramaṇa, the scriptural authority on truth, which came down directly from the mouth of Bhagavān Sadāshiva to His consort Devi Adishakti.
Paramahamsa Nithyananda reveals, “Vedas are the ultimate, superior authority for the Hindus. Vedas are like a pure science, where the ultimate truths are explained, but Agamas are the scriptures where the applied technology, the applied science is expanded. all the Hindu bodies accept Vedas and Agamas as Shruti [that which is heard] and everything else follows as Smritis [the remembered scriptures].
Agamas are directly revealed by Sadashiva; they are more like a practical manual of how to, what to, where to, when to. All these details are answered with the right context, giving enough of understanding and I should say, in a more sympathetic, compassionate way, with a lot of concern for human beings with tremendous user-friendliness.”