Rishi: Traditionally associated with the Śukla-Yajurvedic Adhvaryu lineage (often transmitted under Yājñavalkya’s school authority rather than a single ṛṣi attribution for such operational formulas)
Devata: Agni (as Vratapati)
Chandas: Yajus (prose formula; not a fixed metrical chandas)
ágnē vratapatē vratám acāriṣaṃ tád aśakaṃ tán mē ’rādhī́d amáhaṃ yá ēvā́smí só ’smí
Translation
O Agni, Lord of the vow, I have observed the vow; that have I been able to accomplish. May that be made successful for me: I am this—what indeed I am, that I am.