A Taxonomy of Prompt Defects in LLM Systems

• URL: http://arxiv.org/abs/2509.14404v1
• Date: Wed, 17 Sep 2025 20:11:22 GMT
• Title: A Taxonomy of Prompt Defects in LLM Systems
• Authors: Haoye Tian, Chong Wang, BoYang Yang, Lyuye Zhang, Yang Liu,
• Abstract summary: Large Language Models (LLMs) have become key components of modern software.<n>Small mistakes can cascade into unreliable, insecure, or inefficient behavior.<n>This paper presents the first systematic survey and taxonomy of prompt defects.
• Score: 13.177777446130712
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Large Language Models (LLMs) have become key components of modern software, with prompts acting as their de-facto programming interface. However, prompt design remains largely empirical and small mistakes can cascade into unreliable, insecure, or inefficient behavior. This paper presents the first systematic survey and taxonomy of prompt defects, recurring ways that prompts fail to elicit their intended behavior from LLMs. We organize defects along six dimensions: (1) Specification and Intent, (2) Input and Content, (3) Structure and Formatting, (4) Context and Memory, (5) Performance and Efficiency, and (6) Maintainability and Engineering. Each dimension is refined into fine-grained subtypes, illustrated with concrete examples and root cause analysis. Grounded in software engineering principles, we show how these defects surface in real development workflows and examine their downstream effects. For every subtype, we distill mitigation strategies that span emerging prompt engineering patterns, automated guardrails, testing harnesses, and evaluation frameworks. We then summarize these strategies in a master taxonomy that links defect, impact, and remedy. We conclude with open research challenges and a call for rigorous engineering-oriented methodologies to ensure that LLM-driven systems are dependable by design.

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