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In goal-directed materials optimization powered by artificial intelligence, researchers routinely employ teleological language such as “target properties,” “design objectives,” and “optimal structures,” implicitly assuming that materials evolve toward purposes or that optimized outcomes represent intended final causes. Scientific teleology, defined here as the explanatory practice of invoking goals, purposes, or final causes as causal factors within material systems that lack inherent intentionality, constitutes a distinct conceptual failure mode in artificial-intelligence-driven materials science. This failure arises through three primary mechanisms—reification of goals, retrospective teleology, and purpose projection—that systematically distort the epistemic relationship between human-specified objectives and the contingent structure–property relationships uncovered by optimization algorithms. The present analysis articulates a typology of four specific teleological failure modes: teleological overclaim, design-versus-discovery conflation, objective naturalization, and teleological explanation. Detection principles based on language audits, objective genealogy, counterfactual testing, and agency attribution enable researchers to identify these assumptions before they propagate, while five mitigation principles—explicit objective contextualization, literal-versus-metaphorical clarity, multiple-objective transparency, avoidance of agency language, and consistent design-versus-discovery distinction—provide practical safeguards. By treating scientific teleology as an identifiable failure mode rather than an innocuous heuristic, the materials artificial-intelligence community can preserve the epistemic integrity of discovery processes and prevent the misinterpretation of optimized materials as possessing purposes they do not inherently possess.