What is the purpose of an AGENTS.md file when there are so many different models? Which model or version of the model is the file written for? So much depends o

What is the purpose of an AGENTS.md file when there are so many different models? Which model or version of the model is the file written for? So much depends on assumptions here. It only makes sense when you know exactly which model you are writing for. No wonder the impact is 'all over the place'.