src/tools.py

import os
from langchain.tools import tool

@tool
def web_search(query: str, max_results: int = 3) -> str:
    """
    Search the web for current information about a grocery or gourmet food product.
    Use this when the user asks about recent news, current pricing, availability,
    updated nutritional info, or anything unlikely to be in the product review corpus.
    Input should be a specific product name or question.
    """

    from tavily import TavilyClient
    client = TavilyClient(api_key=os.getenv("TAVILY_API_KEY"))
    results = client.search(query, max_results=max_results)
    snippets = [r["content"] for r in results.get("results", [])]
    return "\n\n".join(snippets) if snippets else "No results found."