The correct choice is Guardrails. Guardrails in Amazon Bedrock let you define safety and content policies and enforce company rules so the assistant gives more factual and consistent answers.

Guardrails are applied to model outputs to restrict topics and enforce policy constraints which reduces hallucinations and improves alignment with company guidelines. They operate at the Bedrock orchestration level so you can shape response content and behavior without changing the underlying LLM.

SageMaker Model Monitor is designed to detect data and model quality drift for SageMaker endpoints and does not directly control or constrain Bedrock chat responses.

Amazon Polly provides text to speech capabilities and it does not affect the factual accuracy or safety of text generated by a language model.

Amazon Rekognition performs image and video analysis and is unrelated to improving a text assistant's reliability.

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