AWS adds single-shot RAG and retrieval-only modes to Amazon Bedrock Managed Knowledge Base

AWS Machine Learning said on its official blog that Amazon Bedrock Managed Knowledge Base now supports single-shot RAG and retrieval-only requests through AgenticRetrieveStream. Single-shot RAG retrieves once and lets a foundation model generate the answer directly, which suits simple lookups, while agentic retrieval can run multiple searches for more complex questions. Developers can also set maxAgentIteration to 0 and disable generation to return deduplicated source passages, making it easier to review policy text directly. Existing requests with values from 2 to 5 remain unchanged.