The phrase "agent known as" is correct and usable in written English.
It can be used when introducing or referring to a specific individual or entity by a particular name or title.
Example: "The investigation was led by an agent known as Smith, who had extensive experience in undercover operations."
Alternatives: "individual referred to as" or "person identified as".
The main chemical agent, known as JWH-18, was named after the Clemson researcher.
It also contained contradictory information about supplies of the chemical warfare agent known as VX, he said.
March 12 , 2018British officials identify the poison as a Soviet-era Russian nerve agent known as Novichok, implicating Russia in the attempted assassination.
Last week, another Russian turncoat, Sergei Skripal, and his daughter, Yulia, were poisoned in Britain with another exotic weapon — a Russian nerve agent known as Novichok.
Men with advanced prostate cancer may be treated with an agent known as sipuleucel-T (Provenge), which is designed to activate the immune system to attack cancer cells.
Tests of a promising anticancer agent known as angiostatin have shown that it enhances the effects of radiation in treating human tumors grafted into mice.
In that film, Darling's thigh arsenal is used to attack zombies infected by the deadly biochemical agent known as DC2 or "Project Terror".
Well, with the help of an agent known as a runner they might start by locating a bachelor from the countryside looking to come to the capital.
In October 2014, at a secret meeting, Bob Rugurika was introduced to a former intelligence agent known as Mwarabu, or "the light-skinned one".
A court cleared Mr. Walesa in 2000 of the persistent charge that he had worked as an agent known as "Bolek" for the secret police.
Montagu was unaware that his brother Ivor, with his passion for leftwing causes and table-tennis, was the Soviet agent known as "Intelligentsia".
