# Amazon Bedrock Managed Knowledge Base adds single-shot and retrieval-only modes

> Original title: Single-shot and agentic retrieval with Amazon Bedrock Managed Knowledge Base

- Source: AWS Machine Learning Blog
- Published: 2026-11-09T20:13:18.000Z
- Bad Influence: https://badinfluence.news/items/izmbvpdlirj763611c36lzmba
- Original: https://aws.amazon.com/blogs/machine-learning/single-shot-and-agentic-retrieval-with-amazon-bedrock-managed-knowledge-base/

## Summary

Amazon Bedrock Managed Knowledge Base now supports single-shot Retrieval Augmented Generation (RAG) and retrieval-only requests through AgenticRetrieveStream, alongside existing agentic retrieval. Single-shot RAG searches knowledge bases once and uses a foundation model to generate an answer, while retrieval-only requests return matching passages without generating one. The maxAgentIteration parameter now accepts values from 0 to 5 to choose among the three modes per request.