When AI Agents Are the Wrong Choice

AI agents are widely used in 2026 for coding, customer communication, IT management, and complex enterprise tasks, but their nondeterministic behavior carries real risks. Because agents rely on large language models that can produce different outputs from the same input, they are unsuitable for tasks requiring exact correctness, such as payroll processing. Experts also caution against using agents where misbehavior could cause serious harm, where costs outweigh benefits, or where genuine human qualities are essential. When deterministic software meets your needs, agents are generally the wrong tool.