Agents in financial products, where the output is not the deliverable — the reason you can show a regulator is.
In fintech you need to reconstruct, months later, what the system saw, what it decided, and why. That requirement shapes the architecture from the first commit. It is close to impossible to retrofit onto something that wasn't built for it.
Every retrieval, tool call, and model response is logged with its inputs. Deterministic paths where the rules are known; generation only where it's safe to generate.