You've just described requirements that belong to a service. Congratulations, you made the right (obvious) decision.

I'm talking about writing entire services that are just wrappers around ffmpeg, pdf2html, parquet-tools, Olson tzdata, or a 10-parameter logistic regression. No stateful behavior, storage, or authoritative source of truth involved. The worst case I've seen was a service that just enumerates a bunch of values of constants (that actually never change).

There may have been some future-proofing in mind at the time, but more likely it was a solution in search of a problem.