Army counter-builder Planned
Would suggest which units and spells answer an enemy army, and say why each one does.
What it will do
Choose an enemy army, or a nation and an age, and the counter-builder would list the units and spells that answer it. Each suggestion would say why it answers, and how we know: a number we measured, a rule the manual states, or a judgement with its authors named. It would never dress a guess up as a measurement.
What it needs
It needs unit and nation data for the whole game, and our own tests of how units answer each other; without both it would only be guessing.