"Whenever there's a new member at a G20 meeting, there is a process of learning and adaptation," Lagarde told AFP after a finance ministers' gathering in Baden Baden, western Germany.
After a two-day meeting, ministers from the group of developed and emerging nations released a communique that dropped past years' language rejecting protectionism, supporting multilateral trade talks, and committing nations to support the 2015 Paris climate accords.
US Treasury Secretary Steven Mnuchin dismissed previous agreements as "not relevant" in remarks to journalists after today's talks.
Carried to power on the back of a political storm over deindustrialisation in vast areas of the US, President Donald Trump vowed in his inauguration speech to "follow two simple rules: buy American and hire American".
His strategy includes threats to penalise companies that manufacture abroad by heavily taxing their products.
But Lagarde insisted that she has "high hopes, especially regarding trade," after the G20 pointed to growing confidence about a global economic recovery and promised to refrain from manipulating currencies.
In the event, there was little debate on the divisive topic around the G20 tables, various sources said.
In its own statement, the IMF said it would ensure "vigorous exchange rate surveillance" to help hold countries to their promises.
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