A compiler is more efficient than an 8 layer llm lasagna stack of tools. Likewise, to stay on topic: a strictly typed language is better than running five python type checkers if you really want type checking.

Its more efficient to have a llm write in a strictly typed language than to duct tape guardrails(either tools or more llm work) after the fact. Depends on what you're building of course. I speak from an industry that ships large executables. (games)