The phrase "important agent" is grammatically correct and can be used in written English.
Example: "The CEO was considered an important agent in the company's success."
Candida is the most important agent of fungal infections.
But the BNDES, in particular, has become an important agent of industrial policy under Lula.
Lynn Nesbit, another important agent, essentially agrees that agenting hasn't changed that much, despite the hype from Hollywood.
It was commonplace in Jacobean London, where the bird was the capital's most important agent of sanitation.
Lack of development finance means the government has become the most important agent in the UK housing market.
Streptococcus suis is an important agent of swine and human meningitis.
Results show that LULC is a very important agent with respect to its impact on mean annual streamflow in UMRB.
Instead of tying themselves in knots about social mobility, politicians should dwell on the single most important "agent" for doing well in life, the teacher.
Citing unnamed sources, The Sunday Herald, a Scottish newspaper, reported in 2000 that Fuisz had been the C.I.A.'s most important agent in Damascus during the 80's.
AS one of the building blocks of the human genome, DNA has become an important agent in medicine and forensic crime-fighting.
Farm groups and others, meanwhile, defend 2,4-D as an important agent in food production that does not need more restrictions.
