Where do I get the program agenix?

[TornaxO7]

According to the tutorial at step 4, I should execute

agenix -e secret1.age

but where do I get the program agenix? There is no NixOS package for it.

[TornaxO7]

jesus christ.... I just saw that "Install CLI via flakes" comes up, if open up the flakes installation part... sorry...