Amazon Bedrock Managed Knowledge Base now supports single-shot RAG and retrieval-only requests through the AgenticRetrieveStream API, alongside agentic retrieval. Set maxAgentIteration to 1 to retrieve once and generate an answer with one foundation model call; set it to 0 to return passages without calling a model. Values from 2 to 5 keep agentic retrieval, with up to n minus 1 planning rounds before answer generation.
AWS says single-shot RAG can reduce latency and model usage compared with agentic retrieval. Retrieval-only mode makes no foundation model calls.
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