Probably related to cwtools/cwtools-hoi4-config#10
For example a variable in variable.cwt like ai_attitude_allied_weight@scope[country] doesn't work in something like
check_variable = { ai_attitude_allied_weight@ROOT > 1 }
instead it assumes that the variable is literally ai_attitude_allied_weight@scope[country]

It does work for types and enums

some_hard_coded_variable@enum[country_tags]
check_variable = { some_hard_coded_variable@TAG > 1 }

some_hard_coded_variable@<state>
check_variable = { some_hard_coded_variable@123 > 1 }

both work and give no error