Quickstart

from typing import Annotated, TypedDict

from langchain_google_genai import ChatGoogleGenerativeAI
from langgraph.graph import StateGraph, START, END
from langgraph.graph.message import add_messages


class State(TypedDict):
    messages: Annotated[list, add_messages]


llm = ChatGoogleGenerativeAI(model="gemini-2.0-flash")


def chatbot(state: State):
    return {"messages": [llm.invoke(state["messages"])]}


graph = StateGraph(State)
graph.add_node("chatbot", chatbot)
graph.add_edge(START, "chatbot")
graph.add_edge("chatbot", END)

server:
  api:
    port: 8000

agent:
  type: LANGGRAPH
  config:
    name: "my-agent"
    graph_definition: "./agent.py:graph"
    checkpointer:
      type: sqlite
      db_url: "sqlite:///conversations.db"