It's great to have the option to optimize for different models, but I'm not going to on 99% of projects. And a good chunk of the agent docs are model agnostic (how to run linter, test libraries/practices). It's cool to have a way to reuse easily, even if that's copying AGENTS.md into the right places.

> And a good chunk of the agent docs are model agnostic (how to run linter, test libraries/practices).

Personally I put stuff like that in the readme, since it's useful stuff for humans too, not directions just for machines, and I'm mostly building for other humans. The lighter and smaller the AGENTS.md end up, the better the models are at following it too, from what I can tell.