Vyāsadeva is mainly known for his work as the complier of the Vedas
He also wrote supplementary scriptures such as the Itihāsas, eighteen Purāṇas, one-hundred-eight Upaniṣads, the Mahābhārata, the Brahma-sūtras (Vedānta-sūtras) .
The itihāsa-purāṇās was entrusted to Romaharṣaṇa Sūta and Śukadeva Gosvāmī (Vyāsa’s son), who later became the first person to publicly recite the Bhāgavatam.
Each of these scriptures contains thousands of millions of verses, a feat that is impossible for a common man.
One can only imagine what potency it took for Vyāsa to write in that way. For this factual reason, Veda-vyāsa is considered to be an incarnation of Lord Kṛṣṇa.
Lord Nārāyaṇa Himself appeared as Vyāsa.
Therefore the present Vyāsa is Kṛṣṇa-dvaipāyana Vyāsa, for He is Lord Nārāyaṇa Himself and not an ordinary śaktyāveśa-avatāra.
vyAsAya vishNu-rUpAya vyAsa-rUpAya vishNave
namo vai Brahma-nidhaye vAsishtAya namo namaH.
[ My repeated salutations to vyAsa who is a form of vishNu and to
vishNu who is a form of vyAsa- sage vyAsa, who is a descendent
of vasishta and who is a treasure of brahman, (i.e. vedas). ]
vedyaṁ vāstavam atra vastu śivadaṁ tāpa-trayonmūlanam
śrīmad-bhāgavate mahā-muni-kṛte kiṁ vā parair īśvaraḥ
sadyo hṛdy avarudhyate ’tra kṛtibhiḥ śuśrūṣubhis tat-kṣaṇāt