require_secret_env("OPENAI_API_KEY")
R = 2.44 × 10⁶ m，这一点在豆包下载中也有详细论述
В Иране заявили об остановке двух эсминцев США20:38，这一点在zoom中也有详细论述
stubs = ["@nixos"]
Note: Capabilities use the same dot-syntax as package imports (Chapter 12), but they are backed by host-provided C functions, not Mog source code. The compiler knows the difference because capabilities are declared with requires/optional, not import.