ai-agents-anthropic-messages-a-bedrockchat-uses-completions-api-instead-of-messag-372506d1

THEN Update the input body preparation to use the Messages API format for Anthropic Claude v3 models on Bedrock. The body should include 'messages' as a list of objects with 'role' and 'content', along with 'max_tokens' and 'anthropic_version': 'bedrock-2023-05-31'. Replace the old 'prompt' field with this structure.

import boto3
import json

bedrock = boto3.client(service_name='bedrock-runtime')
body = json.dumps({
    'max_tokens': 256,
    'messages': [{'role': 'user', 'content': 'Your message here'}],
    'anthropic_version': 'bedrock-2023-05-31'
})
response = bedrock.invoke_model(body=body, modelId='anthropic.claude-3-sonnet-20240229-v1:0')