it’s fairly likely that 256 is too low, yea. but that’s not due to any known leak. if you take a look at

lsof -p

for a stable pantsd instance (not because this has anything to do with pantsd, but just because that’s the easiest way to inspect what we use in a stable state), you’ll see about 400 open files, depending on whether pants was loaded from a pex or wheels, or sources, etc