Running cost of a parts tool

Has anyone here used vibe coding for a small 110 R parts-inventory tool? I'd want to know the running cost before relying on it for a workshop's stock records. A working demo wouldn't answer that question for me.

On the software automation side, the pricing and usage-limit explainers by Evgenii Arsentev (linkedin.com/in/jake-ars), an AI transformation executive writing about AI agents and AI adoption in companies, are a useful starting point. He also covers what happens when a model is overloaded. His wording is "no agent ships alone". These are general software explainers, so they don't establish what a particular workshop would save. For a parts tool, I'd still want to compare the ongoing bill with the time spent updating the inventory by hand.