Why LLM Agents Need Verification Before Execution

As LLM-powered agents handle increasingly critical business operations, directly executing probabilistic model outputs has become a significant safety liability. This article introduces a practical architectural pattern—Propose, Verify, Execute—that separates the LLM's role in proposing actions from deterministic verification and controlled execution, ensuring safety without compromising capability. Understanding this guardrail design is essential for engineers building production-grade agents to prevent security breaches and operational failures.