Grats author here. I agree, decorators would be preferable. However, decorators are a runtime construct and as such cannot be applied to type constructs. This means you can’t, for example, annotate an interface definition, or add a description to an argument (since arguments are declared using an object type literal).

You can read more about how I ended up settling on docblocks here: https://grats.capt.dev/docs/faq/why-use-comments