"""
Large Language Model (LLM) initialization.

Creates a singleton instance of ChatOpenAI (GPT-4o-mini) used by all
agents that need an LLM (Router and Search Agent).
The Recommender Agent does NOT use the LLM.

To change the model, just modify LLM_MODEL_NAME in config.py.
"""

from langchain_openai import ChatOpenAI
from utils.config import LLM_MODEL_NAME, LLM_TEMPERATURE

# Shared LLM instance — imported by graph.py and injected into the agents
llm = ChatOpenAI(model=LLM_MODEL_NAME, temperature=LLM_TEMPERATURE)