The AgaviFromPopulationFilter is handy to re-fill a form after validation failed and the user needs to check the values again (without refilling them by hand again).
But the FormPopulationFilter (FPF) is also capable of pre-filling forms.
and your Formfields 'name' and 'description' will be prefilled.
I added the check for 'read' method, since you don't want to auto populate in the case you submitted the data.