Its a really well thought out way to combine schemas, templates, and data into one language. Its a superset of JSON and it provides a functional interface to validate inputs, outputs, and configurations.
It integrates very nicely with go and can convert between go structs into cue structs and vice versa.
CUE's validation is very strong, as long as you're ok with some level of functional programming and immutability.
Despite what GPT said above, its Configure, Unify, Execute. The Execute aspect is powerful but you have to be ok with functional programming and immutability.
Boeing used to make airplanes. Now they outsource the work of "make the airplanes" and all it cost them was their reputation.
Less outsourcing, more just doing the work please.