Construct LangGraph Prior-Authorization Workflow

from langgraph.graph import StateGraph, END
from langchain_community.llms import Ollama # or Llama 3.3 70B provider

# Define state schema for oncology prior authorization
class PriorAuthState(dict):
    patient_id: str
    clinical_text: str
    mutation_dosage: float
    decision: str

# Create LangGraph state nodes
workflow = StateGraph(PriorAuthState)
# Define extraction, rule check, and decision synthesis nodes