arxiv:2604.24826

A Comparative Evaluation of AI Agent Security Guardrails

Published on Apr 27

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Abstract

DKnownAI Guard demonstrates superior performance in AI agent security by achieving the highest recall rate and true negative rate compared to AWS Bedrock Guardrails, Azure Content Safety, and Lakera Guard.

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This report presents a comparative evaluation of DKnownAI Guard in AI agent security scenarios, benchmarked against three competing products: AWS Bedrock Guardrails, Azure Content Safety, and Lakera Guard. Using human annotation as the ground truth, we assess each guardrail's ability to detect two categories of risks: threats to the agent itself (e.g., instruction override, indirect injection, tool abuse) and requests intended to elicit harmful content (e.g., hate speech, pornography, violence). Evaluation results demonstrate that DKnownAI Guard achieves the highest recall rate at 96.5\% and ranks first in true negative rate (TNR) at 90.4\%, delivering the best overall performance among all evaluated guardrails.

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