Best AI Agent Security Tools for SMB and Enterprise in 2026

This report surveys the AI agent security landscape, comparing technical guardrail solutions (e.g., Galileo, Lakera Guard, NVIDIA NeMo, AWS Bedrock, Azure Content Safety, Guardrails AI, Patronus) with human-layer defenses (notably KnowBe4's AIDA) and arguing that defense-in-depth requires both model-level protections and workforce-focused tools to counter AI-driven phishing, deepfakes, and social engineering; it also provides deployment notes, limitations, and six critical capabilities for evaluating AI agent security products.