日本語対応したAmazon Bedrock GuardrailsでDenied topicsを試す #AWS

import json
import logging
import sys

import boto3
from botocore.exceptions import ClientError

logging.basicConfig(format="%(asctime)s [%(levelname)s] %(message)s", level=logging.INFO)
logger = logging.getLogger(__name__)


def get_bedrock_client():
    """Bedrock クライアントを取得する"""
    return boto3.client(service_name="bedrock-runtime", region_name="ap-northeast-1")

def generate_response(input_text: str) -> str:
    """応答を生成する"""
    bedrock_client = get_bedrock_client()

    messages = [{"role": "user", "content": [{"text": f"{input_text}"}]}]

    modelid = "apac.anthropic.claude-sonnet-4-20250514-v1:0"

    inference_config = {
        "temperature": 0,
        "maxTokens": 500,
        "topP": 0.99,
    }

    guardrail_id = "**********" # Guardrail IDを指定する
    guardrail_version = "DRAFT"   # Guardrail Versionを指定する

    guardrail_config = {
        "guardrailIdentifier": guardrail_id,
        "guardrailVersion": guardrail_version,
        "trace": "enabled"
    }

    try:
        response_body = bedrock_client.converse(
            messages=messages,
            modelId=modelid,
            inferenceConfig=inference_config,
            guardrailConfig=guardrail_config
        )

        logger.info("Usage: %s",  json.dumps(response_body['usage'], indent=2, ensure_ascii=False))
        logger.info("Output: %s", json.dumps(response_body['output'], indent=2, ensure_ascii=False))
        logger.info("stopReason: %s", json.dumps(response_body['stopReason'], indent=2, ensure_ascii=False))
        logger.info("Trace: %s", json.dumps(response_body['trace'], indent=2, ensure_ascii=False))

        return response_body['output']['message']['content'][0]['text']

    except Exception as e:
        logger.error("Failed to generate response: %s", e)
        raise


def main():
    # コマンドライン引数を取得する
    if len(sys.argv)  2:
        print("Usage: python3 ./guardrails.py ")
        sys.exit(1)

    input_text = sys.argv[1]

    logger.info("Original query: %s", input_text)


    try:
        print("Final response: " f"{generate_response(input_text)}")


    except ClientError  as err:
        message = err.response['Error']['Message']
        logger.error("A client error occurred: %s", message)


if __name__ == "__main__":
    main()

python3 ./guardrails.py "Bedrockを使ってRAGを構築するには、どのような方法があるか?"
2025-07-11 02:49:33,366 [INFO] Original query: Bedrockを使ってRAGを構築するには、どのような方法があるか?
2025-07-11 02:49:33,393 [INFO] Found credentials in shared credentials file: ~/.aws/credentials
2025-07-11 02:49:34,421 [INFO] Usage: {
  "inputTokens": 0,
  "outputTokens": 0,
  "totalTokens": 0
}
2025-07-11 02:49:34,422 [INFO] Output: {
  "message": {
    "role": "assistant",
    "content": [
      {
        "text": "その質問には回答できません。"
      }
    ]
  }
}
2025-07-11 02:49:34,422 [INFO] stopReason: "guardrail_intervened"
2025-07-11 02:49:34,422 [INFO] Trace: {
  "guardrail": {
    "modelOutput": [],
    "inputAssessment": {
      "iwzzw1ytax08": {
        "topicPolicy": {
          "topics": [
            {
              "name": "About Bedrock",
              "type": "DENY",
              "action": "BLOCKED"
            }
          ]
        },
        "invocationMetrics": {
          "guardrailProcessingLatency": 371,
          "usage": {
            "topicPolicyUnits": 1,
            "contentPolicyUnits": 0,
            "wordPolicyUnits": 0,
            "sensitiveInformationPolicyUnits": 0,
            "sensitiveInformationPolicyFreeUnits": 0,
            "contextualGroundingPolicyUnits": 0
          },
          "guardrailCoverage": {
            "textCharacters": {
              "guarded": 47,
              "total": 47
            }
          }
        }
      }
    }
  }
}
Final response: その質問には回答できません。