Constraint Decay: The Fragility of LLM Agents in Back End Code Generation
The paper discusses the limitations of Large Language Model (LLM) agents in backend code generation, particularly regarding structural constraints. It highlights a phenomenon called constraint decay, where agent performance declines as structural requirements increase. The study emphasizes the challenge of balancing functional and structural requirements in software development.
- ▪LLM agents perform well under loose specifications but struggle with strict structural constraints.
- ▪The study evaluates agent performance across 80 tasks and identifies significant performance disparities based on framework complexity.
- ▪Data-layer defects are the leading causes of errors in code generated by LLM agents.
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Computer Science > Software Engineering arXiv:2605.06445 (cs) [Submitted on 7 May 2026] Title:Constraint Decay: The Fragility of LLM Agents in Backend Code Generation Authors:Francesco Dente, Dario Satriani, Paolo Papotti View a PDF of the paper titled Constraint Decay: The Fragility of LLM Agents in Backend Code Generation, by Francesco Dente and 2 other authors View PDF HTML (experimental) Abstract:Large Language Model (LLM) agents demonstrate strong performance in autonomous code generation under loose specifications. However, production-grade software requires strict adherence to structural constraints, such as architectural patterns, databases, and object-relational mappings.
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