Both Uses

competent
in
Cujo
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Actual spot production was handled by a small independent studio in Boston, the New York market-analysis firm went on doing its thing competently, and three or four times a year either Vic or Roger flew to Cleveland to confer with Carroll Sharp and his kid — said kid now going decidedly gray around the temples.†
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competently = in a capable or adequate manner
And she had let him take over and be competent, which she hardly ever was in emergencies; she usually just turned to mush.†

competent = sufficiently capable

Definitions:

(1) (competent)
capable (able to do something in a generally satisfactory manner) -- sometimes specifically to have legal capability
(2) (meaning too rare to warrant focus)
In the field of law, competent has the specialized meaning of being legally qualified to do something such as to be mentally fit to make reasonable decisions; or to have jurisdiction or authority to take an action.

In classic literature, a competency can refer to having an income or assets to support living expenses.