In March 2026, OpenAI acquired Promptfoo — the tool that 350,000 developers use to evaluate and red-team OpenAI's own models. I don't think that makes Promptfoo suddenly useless. But it made me ask a question I should have asked earlier: who is the eval tool accountable to? Most LLM eval frameworks — DeepEval, Ragas, LangSmith — have something in common. They all route scoring through an LLM API call. That means your eval pipeline has at least three dependencies you don't control: the tool...