app/graph/nodes/rag_answer_node.py

# app/graph/nodes/rag_answer_node.py

from app.core.llm_engine import llm
from app.core.prompts.rag_prompt import rag_prompt
from langchain_core.output_parsers import StrOutputParser

chain = rag_prompt | llm | StrOutputParser()


def rag_answer_node(state):
    response = chain.invoke({
        "context": state.get("context", ""),
        "query": state.get("query")
    })

    return {
        **state,
        "final_answer": response
    }