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Constraint Decay: The Fragility of LLM Agents in Backend Code Generation

·2026.05.25 23:48

Key point

The study analyzes the limitations of LLM agents in adhering to API and architectural constraints when developing production-grade backends.

Details

LLM agents are proficient at generating code from loosely specified requirements, but they show fragility in adhering to API contracts, architecture, DB, and ORM constraints that are essential in real production environments.

With functional requirements fixed via OpenAPI specifications, the experiment conducted 80 greenfield tasks and 20 feature implementation tasks across 8 web frameworks.

The results revealed a phenomenon called Constraint Decay, in which agent performance degrades as more complex constraints are added.

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