A real “free trade” agreement would require only one sentence:
“Any and all national legal barriers to trade implemented by a member country may be duplicated by any other member country in its dealings with that country, until such time as those barriers have been removed.”
The end.
Many years ago my brother came up with a one sentence trade/tariff policy for the U.S.:
Commencing on xxx date, all tariffs imposed against any country will be at the level of the highest tariff that country imposes on any U.S. export.
That should quickly evolve into ‘how low can you go.’