2 min readfrom Machine Learning

How do you test AI agents in production? The unpredictability is overwhelming.[D]

Our take

Testing AI agents in production presents unique challenges, especially when dealing with non-deterministic outputs. Traditional quality assurance methods, which rely on predictable input-output relationships, often fall short. As AI models handle complex, multi-step tasks, the unpredictability in reasoning and tool selection complicates the validation process. Snapshot testing can be too fragile, and human evaluations lack scalability. To ensure rigorous quality, a framework is needed that verifies the reasoning steps of these agents without relying on hardcoded outputs or introducing additional failure modes.

The challenge of testing AI agents in production settings, particularly those powered by large language models (LLMs), underscores the complexities that arise when traditional quality assurance (QA) methodologies encounter non-deterministic outputs. As highlighted in the recent discussion by a seasoned QA professional, the shift from a deterministic model of testing—where given input X reliably produces output Y—to one that embraces variability and uncertainty presents a significant hurdle. This evolution necessitates a rethinking of how we approach quality in AI systems, especially as organizations increasingly rely on these agents to perform critical multi-step tasks with real-world implications. For further context, readers may find value in exploring related insights in articles like Are there REAL success stories of autonomous AI dev agents working reliably in production? and If you're building AI agents, logs aren't enough. You need evidence..

The unpredictability associated with LLMs can make traditional QA practices feel inadequate. Snapshot testing, for instance, often fails due to variations in phrasing that might still reflect correct reasoning. This fragility reveals a stark contrast to the more stable outputs of conventional systems. The notion of applying regex or keyword matching further complicates matters, as it risks overlooking subtle reasoning errors that could lead to incorrect conclusions. This situation leaves QA professionals in a bind: they are expected to ensure quality but lack the tools to rigorously assess the reasoning processes of their AI agents.

The implications of these challenges extend beyond the immediate concerns of QA teams. As organizations deploy LLM-based agents within their products, the stakes increase dramatically. Poor performance or erroneous outputs can lead to significant consequences, affecting user trust and satisfaction. The need for a framework that can verify agentic reasoning is not merely an academic concern; it is a practical necessity for businesses seeking to leverage AI to enhance productivity and innovation. Without a robust methodology for evaluating AI reasoning, organizations may find themselves navigating a precarious landscape where the risks of deployment outweigh the potential benefits.

Looking ahead, the evolution of testing frameworks will be crucial in shaping the future of AI agents in production. As the industry grapples with these challenges, we might witness a shift towards more sophisticated evaluation methods—perhaps integrating human-in-the-loop systems that allow for nuanced assessments of reasoning processes. Such developments could not only enhance the reliability of AI agents but also empower teams to innovate confidently. It raises an important question: how will we balance the need for rigorous testing with the inherent unpredictability of AI, and what new methodologies will emerge to address this? The journey towards establishing effective evaluation standards for AI agents is just beginning, and it will be fascinating to observe how this unfolds in the coming years.

I’ve been in QA for almost a decade. My mental model for quality was always: given input X, assert output Y. Now I’m on a team that’s shipping an LLM-based agent that handles multi-step tasks. I genuinely do not know how to test this in a way that feels rigorous.

The thing works. But the output isn’t deterministic. The same input can produce different reasoning chains across runs. Hell even with temp=0 I see variation in tool selection and intermediate steps. My normal instincts don’t map here. I can’t write an assertion and run it a thousand times to track flakiness. I’m at a loss for what to do.

Snapshot testing on final outputs is too brittle. If there’s a correct response that’s worded differently it breaks the test. Regex/keyword matching on outputs misses reasoning errors that accidentally land on the correct answer. Human eval isn’t automatable and doesn’t scale. Evals with a scoring rubric almost works but I don’t have a way to set pass/fail thresholds.

I want something conceptually equivalent to integration tests for reasoning steps. Like, given this tool result does the next step correctly incorporate it? I don’t know how to make that assertion without either hardcoding expected outputs or using another LLM as a judge, which would introduce a new failure mode into my test suite.

The agent runs inside our product. There are real uses and actual consequences when it makes a bad call.

Is there a framework that allows for verifying of agentic reasoning?

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