[2] The film's music was composed by Yuvan Shankar Raja, with cinematography handled by duo Theni Eashwar and Saravanan Ramasamy and editing done by Ajay.

[3] Kannayiram, a self-proclaimed, unassuming private detective with a sleeplessness issue, grieving for his mother’s death, forcefully stays in his native village for the asset dispute of his family heirloom.

After solving the case, he finds out that doctor Karthikeyan along with his assistant Punniyam killed so many people and put the dead bodies near the bridge.

"[14] Srivatsan S of The Hindu wrote "Unfortunately Agent Kannayiram ends up being an exasperating watch lacking a soul, fittingly, for a film about dead bodies and lonely deaths.

"[17] Thinkal Menon of OTT Play gave the film 1.5 out of 5 stars and wrote "A Santhanam-starrer usually is loaded with minimum entertaining elements irrespective of its total outcome.

"[18] Yuva Nandini of ABP Live gave the film 4 out of 5 stars and wrote "Agent Kannayiram is sure to be one of the best in Santhanam's career.