# Caller
<a name="API_agent-runtime_Caller"></a>

Details about a caller.

## Contents
<a name="API_agent-runtime_Caller_Contents"></a>

**Important**  
This data type is a UNION, so only one of the following members can be specified when used or returned.

 ** agentAliasArn **   <a name="bedrock-Type-agent-runtime_Caller-agentAliasArn"></a>
The caller's agent alias ARN.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 2048.  
Pattern: `arn:aws(-[^:]+)?:bedrock:[a-z0-9-]{1,20}:[0-9]{12}:agent-alias/[0-9a-zA-Z]{10}/[0-9a-zA-Z]{10}`   
Required: No

## See Also
<a name="API_agent-runtime_Caller_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-agent-runtime-2023-07-26/Caller) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/bedrock-agent-runtime-2023-07-26/Caller) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/bedrock-agent-runtime-2023-07-26/Caller)