Question

A healthcare company deploys a patient-facing chatbot on Amazon Bedrock. Legal requires that whenever a user attempts to obtain medical dosage advice (a denied topic), the system must return a fixed, legally-approved disclaimer message rather than the model's generated text, and the interaction must be recorded for audit. The team has already created a Bedrock Guardrail with the denied topic configured. What is the MOST appropriate way to meet the requirement that a specific approved message is shown when this topic is triggered?

Accepted Answer

Configure the blocked messaging (blockedInputMessaging / blockedOutputsMessaging) text directly in the guardrail so Bedrock returns the approved disclaimer when the denied topic is detected.

Answer

Add the disclaimer text to the model's system prompt and instruct the model to output it whenever dosage questions are asked.

Answer

Attach an IAM policy that denies InvokeModel when the request contains dosage-related keywords and return the disclaimer from the access-denied error.

Answer

Use a Lambda post-processing function to scan every model response with regex and replace medical content with the disclaimer before returning it to the user.