There may not be a universally agreed upon threshold for the minimum required for AGI, but there's certainly a point where if you find yourself beyond it then AGI definitely has been developed.
There are some thresholds where I think it would be obvious that a machine has.
Put the AI in a robot body and if you can interact with it the same way you would interact with a person (ie you can teach it to make your bed, to pull weeds in the garden, to drive your car, etc…) and it can take what you teach it and continually build on that knowledge, then the AI is likely an instance of AGI.
