The community member is using the ContextRetrieverOpenAIAgent from the provided example and wants to get context injection from different chunks of data in their index. The first example uses query engine tools, while the second one uses a retriever. The community member is asking how these two approaches differ and which one they should use.
In the comments, another community member explains that both examples are actually pretty similar - you give an agent some tools, plus a retriever, and then ask a question. The agent uses the retriever you provided as context for which tool to use.
