What AGENTS.md and skills are people relying on these days?

I have little to none and am successful building full stack Go apps Claude Code, Codex, and Shelley which covers the spectrum of crazy black box to simple `bash` clanker.

It makes me think the models are continually improving in knowing what to do on their own.

I do put some major work into the classic "Developer Experience" (DX) of my code base. Standard Go tooling, idiomatic Go, well designed initial test harnesses, GitHub actions that enforce some linting.

I think that works better than any markdown instructions ever will.