# HarnessMessage
<a name="API_HarnessMessage"></a>

A message in the conversation.

## Contents
<a name="API_HarnessMessage_Contents"></a>

 ** content **   <a name="BedrockAgentCore-Type-HarnessMessage-content"></a>
The content blocks of the message.  
Type: Array of [HarnessContentBlock](API_HarnessContentBlock.md) objects  
Required: Yes

 ** role **   <a name="BedrockAgentCore-Type-HarnessMessage-role"></a>
The role of the message sender.  
Type: String  
Valid Values: `user | assistant`   
Required: Yes

## See Also
<a name="API_HarnessMessage_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/bedrock-agentcore-2024-02-28/HarnessMessage) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/bedrock-agentcore-2024-02-28/HarnessMessage) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/bedrock-agentcore-2024-02-28/HarnessMessage)