Ch.07 - Make dynamic tool selector section more clear and meaningful

[JamesCHub]

The book is extremely useful and well-written.

In the section in Chapter 6 entitled "Dealing with Many Tools", we don't add any new tools, and don't limit the retriever, so the point of the section is a bit lost.

But if we simply modify the retriever definition to:
tools_retriever = InMemoryVectorStore.from_documents([Document(tool.description, metadata={"name":tool.name}) for tool in ourTools], embeddingsModel).as_retriever(search_kwargs={"k": 1, "fetch_k": 2})

We'll force the agent to choose the best single tool to answer the prompt.

We can then cycle through three prompts:

1. "When was Calvin Coolidge born?" (only search will be selected)
2. "2+2=" (only calculator will be selected)
3. "How old was the 30th president of the US when he died?" (search will be selected)