# RetrieverConfiguration
<a name="API_agent-runtime_RetrieverConfiguration"></a>

Configuration for a retriever, specified as a union of retriever types.

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

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

 ** knowledgeBase **   <a name="bedrock-Type-agent-runtime_RetrieverConfiguration-knowledgeBase"></a>
Configuration for a knowledge base retriever.  
Type: [KnowledgeBaseRetrieverConfiguration](API_agent-runtime_KnowledgeBaseRetrieverConfiguration.md) object  
Required: No

## See Also
<a name="API_agent-runtime_RetrieverConfiguration_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\+\+](https://docs.aws.amazon.com/goto/SdkForCpp/bedrock-agent-runtime-2023-07-26/RetrieverConfiguration) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/bedrock-agent-runtime-2023-07-26/RetrieverConfiguration) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/bedrock-agent-runtime-2023-07-26/RetrieverConfiguration)