The phrase "a formidable tool" is correct and usable in written English.
It can be used to describe an object, method, or resource that is powerful and effective in achieving a particular purpose.
Example: "The new software has proven to be a formidable tool for data analysis, significantly improving our efficiency."
Alternatives: "an impressive resource" or "a powerful asset."
The internet paints a damning picture, but more importantly proves itself to be a formidable tool in the fight against criminality that might otherwise go unnoticed.
The takeaway from this is that he might actually have a hit record that could be a formidable tool against his father and Empire.
As for the "indistinguishability of lies and truth," the Internet is also a formidable tool for tracking down information, precisely in the interest of distinguishing lies from truth.
While the right of first refusal is a formidable tool, it is also an expensive one; most condominiums are hardly in a position to block sales they don't approve of by buying apartments they don't really need.
He said the posting of customs inspectors abroad, a 17-month-old program known as the Container Security Initiative, had "emerged as a formidable tool for protecting us from the threat of terrorism".
Argentina vowed never to pay the remainder, and for nearly a decade has refused to obey American court orders requiring it to settle up with these "hold-outs".Frustrated with Argentina's intransigence, in 2012 a judge in New York devised a formidable tool to bring the country into line.
"In some ways that is an even more formidable tool that the state of California and like-minded local governments can utilize to deny approval of things like oil terminals and pipelines crossing state sovereign tidelands," said Richard Frank, director of the California Environmental Law & Policy Center at UC Davis.
The journalist Clive Thompson, in his 2013 book, "Smarter Than You Think: How Technology Is Changing Our Minds for the Better," suggests that for some tasks the most formidable tool is neither a human brain nor a computer but both working in tandem — a "centaur" strategy.
The ubiquity of fashionable starlets has proven a formidable sales tool, driving the commercial success of cobwebby ponchos, tweed blazers and satin pencil skirts for fall.
Sound can be a formidable psychological tool used in storytelling.
The researchers argue that Twitter has become a "formidable broadcasting tool" for world leaders.
