Modern QA2026Limitations of ReAct for Testing — tiles
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1.6Limitations of ReAct for Testing

  1. Non-deterministic. The same test objective may take different paths on different runs. This is a feature for exploration but a problem for regression testing.

  2. Expensive. Each step requires an LLM call. A 20-step test costs 20x more in tokens than a script.

  3. Slow. LLM latency (100-500ms per call) adds up. A 20-step agent takes 2-10 seconds just for reasoning, plus action execution time.

  4. Hallucination risk. The agent might "see" elements that do not exist or misinterpret page content.

  5. Debugging difficulty. When a ReAct agent fails, you have to trace through its reasoning history to understand why. This is harder than debugging a linear script.

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