LangGraph ReAct Agent

Build a full ReAct agent that can read conversations, send messages, and search your knowledge base.

import asyncio
from langchain_anthropic import ChatAnthropic
from langgraph.prebuilt import create_react_agent
from dialogbrain import get_langchain_tools

async def main():
    llm = ChatAnthropic(model="claude-sonnet-4-6")

    async with get_langchain_tools(api_key="db_live_YOUR_KEY") as tools:
        agent = create_react_agent(
            llm,
            tools,
            state_modifier=(
                "You are a helpful assistant with access to DialogBrain messaging tools. "
                "You can read conversations, send messages, search contacts, and more."
            ),
        )

        # Example: find and respond to unanswered questions
        result = await agent.ainvoke({
            "messages": [{
                "role": "user",
                "content": "Find the last 3 conversations and summarize them"
            }]
        })
        print(result["messages"][-1].content)

asyncio.run(main())

Streaming

async for chunk in agent.astream({"messages": [{"role": "user", "content": "..."}]}):
    if "messages" in chunk:
        for msg in chunk["messages"]:
            if hasattr(msg, "content") and msg.content:
                print(msg.content, end="", flush=True)

Streaming​

Streaming