Can't we just use claude desktop / cli to generate an invoice. In my experience if you provide some skills and access to some data it can generate pretty consistent invoices. No other tools needed at all.

Invoices have strict requirements and having the model accidentally hallucinate and make an incorrect invoice could put you in legal trouble. Besides, why would you pay for tokens instead of using a free tool?

Why would you knowingly generate invoices that are sometimes wrong? That’s probably illegal and certainly going to be a pain in the ass. Why make a critical business function dependent of the availability of an external service when you could easily do it locally?

My clients love non-deterministic invoices.