How to configure LLM to select only one most appropriate tool or none for user query

[hikaru103tom]

I'm seeking guidance on configuring a LLM to select either the single most relevant tool or none at all in response to a user's query, ensuring that it does not select multiple tools simultaneously.

The official documentation recommends using a vector store to identify the most suitable tool. Following this guidance, I implemented the following code to select the most relevant tool:

results = vector_store.similarity_search(query)  
best_match = results[0] if results else None

However, is it possible to configure the LLM itself to select only one most appropriate tool for a user's query without utilizing a vector store?

I have reviewed the official documentation and related materials but have not found a suitable method.

If there is a way to achieve this configuration or any reference materials that could assist, I would greatly appreciate your guidance.