Integrating LangGraph with AlloyDB Data via CData Connect AI

Dibyendu Datta
Lead Technology Evangelist

Leverage CData Connect AI to enable LangGraph agents to securely access and act on AlloyDB data within automated workflows.

LangGraph is a framework for building and visualizing intelligent, graph-based AI workflows that combine reasoning models (LLMs) with tool integrations and data operations. By integrating it with the CData Connect AI, you can enable agents to securely access, query, and act on live enterprise data in real-time via a standardized toolset.

CData Connect AI is a managed MCP-platform that allows you to expose your data sources (such as AlloyDB) through the Model Context Protocol (MCP). This means your AI agents can work with metadata, catalogs, tables, and SQL-enabled data access from over 350 data sources, without complex ETL or custom integrations.

This article explores how to register the MCP endpoint in LangGraph, configure data source connectivity via CData Connect AI, and build a workflow that queries and visualizes live data (for example, AlloyDB objects) on demand. It demonstrates how to use the built-in MCP toolset (getCatalogs, getSchemas, getTables, queryData, etc.) to enable natural-language agents to interact with your enterprise data securely and interactively.

Prerequisites

An account in CData Connect AI.
Python version 3.10 or higher, to install the LangGraph packages.
Generate and save an OpenAI API key.
Install Visual Studio Code in your system.
Obtain and save the LangGraph API key from LangGraph.

Step 1: Configure AlloyDB Connectivity for LangGraph

Before LangGraph can access AlloyDB, a AlloyDB connection must be created in CData Connect AI. This connection is then exposed to LangGraph through the remote MCP server.

Log in to Connect AI click Sources, and then click + Add Connection
From the available data sources, choose AlloyDB
Enter the necessary authentication properties to connect to AlloyDB.
The following connection properties are usually required in order to connect to AlloyDB.
- Server: The host name or IP of the server hosting the AlloyDB database.
- User: The user which will be used to authenticate with the AlloyDB server.
- Password: The password which will be used to authenticate with the AlloyDB server.
You can also optionally set the following:
- Database: The database to connect to when connecting to the AlloyDB Server. If this is not set, the user's default database will be used.
- Port: The port of the server hosting the AlloyDB database. This property is set to 5432 by default.
Authenticating with Standard Authentication

Standard authentication (using the user/password combination supplied earlier) is the default form of authentication.

No further action is required to leverage Standard Authentication to connect.

Authenticating with pg_hba.conf Auth Schemes

There are additional methods of authentication available which must be enabled in the pg_hba.conf file on the AlloyDB server.

Find instructions about authentication setup on the AlloyDB Server here.

Authenticating with MD5 Authentication

This authentication method must be enabled by setting the auth-method in the pg_hba.conf file to md5.

Authenticating with SASL Authentication

This authentication method must be enabled by setting the auth-method in the pg_hba.conf file to scram-sha-256.
Authenticating with Kerberos

The authentication with Kerberos is initiated by AlloyDB Server when the ∏ is trying to connect to it. You should set up Kerberos on the AlloyDB Server to activate this authentication method. Once you have Kerberos authentication set up on the AlloyDB Server, see the Kerberos section of the help documentation for details on how to authenticate with Kerberos.
Click Save & Test
Once authenticated, open the Permissions tab in the AlloyDB connection and configure user-based permissions as required

Generate a Personal Access Token (PAT)

LangGraph authenticates to Connect AI using an account email and a Personal Access Token (PAT). Creating separate PATs for each integration is recommended to maintain granular access control.

In Connect AI, select the Gear icon in the top-right to open Settings
Under Access Tokens, select Create PAT
Provide a descriptive name for the token and select Create
Copy the token and store it securely. The PAT will only be visible during creation

With the AlloyDB connection configured and a PAT generated, LangGraph is prepared to connect to AlloyDB data through the CData MCP server.

Step 2: Set up your development environment

Set up your project directory and install the required dependencies to connect LangGraph with CData Connect AI and use OpenAI LLM for reasoning. This setup enables LangGraph to call the AlloyDB MCP server tools exposed by Connect AI while OpenAI processes the natural language reasoning.

Create a new folder for your LangGraph project:
```
mkdir LangGraph cd LangGraph
```

Install the required Python packages:

pip install langgraph langchain-openai langchain-mcp-adapters python-dotenv "langgraph-cli[inmem]"

Ensure you have Python 3.10+ and a valid OpenAI API key configured in your environment.

Step 3: Configure the MCP connection environment variables

LangGraph uses environment variables to connect to the CData Connect AI and define the API credentials and configuration settings. Store these credentials in a .env file to keep them secure and reusable. LangGraph automatically reads this file at runtime, so the script can authenticate and communicate with the MCP server without hardcoding sensitive information.

Create a new file named .env in your project directory.

Add the following environment variables to define your LangGraph, CData Connect AI, and OpenAI configuration:

# LangSmith (Optional) 
LANGSMITH_API_KEY=lsv2_pt_xxxx   #LangSmith API Key
LANGCHAIN_TRACING_V2=true 
LANGCHAIN_PROJECT=LangGraph-Demo 

# MCP Configuration 
MCP_BASE_URL=https://mcp.cloud.cdata.com/mcp   #MCP Server URL
MCP_AUTH=base64encoded(EMAIL:PAT)   #Base64 encoded Connect AI Email:PAT
OPENAI_API_KEY=sk-proj-xxxx

Save the file. LangGraph uses these values to authenticate with the CData Connect AI AlloyDB MCP server to connect with the AlloyDB data and initialize the OpenAI model for reasoning.

Note: You can generate the Base64-encoded authorization string using any online Base64 encoder, such as Base64 encoding tool. Encode your CData Connect AI username and PAT (obtained in the prerequisites).

Step 4: Create the LangGraph agent script

In this step, you need to create a Python script that connects LangGraph to your CData Connect AI MCP server. The script retrieves the available MCP tools, such as getCatalogs, getSchemas, and queryData, builds a LangGraph workflow, and runs a natural language prompt against your connected AlloyDB data.

The workflow uses the MCP to securely retrieve live AlloyDB data from Connect AI and uses OpenAI GPT-4o to interpret and reason over that data. You also expose the graph so you can visualize it later in LangGraph Studio.

Create the file

Create a new Python file named test.py inside your LangGraph project folder.

Add the following code

Use the following script into test.py:

import asyncio
import os
import operator
from typing_extensions import TypedDict, Annotated
from dotenv import load_dotenv

from langgraph.graph import StateGraph, START, END
from langchain.agents import create_agent
from langchain_mcp_adapters.client import MultiServerMCPClient
from langchain_openai import ChatOpenAI
from langchain_core.messages import BaseMessage, HumanMessage

# Load environment variables
load_dotenv()

# Define the agent state
class AgentState(TypedDict):
    messages: Annotated[list[BaseMessage], operator.add]

# Define the async agent logic
async def run_agent(user_prompt: str) -> str:
    MCP_BASE_URL = os.getenv("MCP_BASE_URL")
    MCP_AUTH = os.getenv("MCP_AUTH")
    OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")

    print("Connecting to the MCP server...")
    mcp_client = MultiServerMCPClient(
        connections={
            "default": {
                "transport": "streamable_http",
                "url": MCP_BASE_URL,
                "headers": {"Authorization": f"Basic {MCP_AUTH}"} if MCP_AUTH else {},
            }
        }
    )

    print("Loading available MCP tools...")
    all_mcp_tools = await mcp_client.get_tools()
    print(f"Loaded tools: {[tool.name for tool in all_mcp_tools]}")

    # Initialize the LLM
    llm = ChatOpenAI(model="gpt-4o", temperature=0.2, api_key=OPENAI_API_KEY)

    print("Creating the LangGraph agent...")
    agent = create_agent(
        model=llm,
        tools=all_mcp_tools,
        system_prompt="You are a helpful assistant. Use tools when needed."
    )

    # Build the workflow graph
    builder = StateGraph(AgentState)
    builder.add_node("agent", agent)
    builder.add_edge(START, "agent")
    builder.add_edge("agent", END)
    graph_instance = builder.compile()

    print(f"Processing user query: {user_prompt}\n")
    initial_state = {"messages": [HumanMessage(content=user_prompt)]}
    result = await graph_instance.ainvoke(initial_state)
    print(f"Agent Response:\n{result['messages'][-1].content}")

# Expose the graph for visualization
builder = StateGraph(AgentState)
builder.add_node(
    "agent",
    create_agent(
        model=ChatOpenAI(model="gpt-4o", temperature=0.2, api_key=os.getenv("OPENAI_API_KEY")),
        tools=[],
        system_prompt="You are a helpful assistant."
    )
)
builder.add_edge(START, "agent")
builder.add_edge("agent", END)
graph = builder.compile()

if __name__ == "__main__":
    import argparse
    parser = argparse.ArgumentParser()
    parser.add_argument("--serve", action="store_true", help="Run visualization server")
    args = parser.parse_args()

    if args.serve:
        print("To visualize the graph, run:")
        print("langgraph dev")
    else:
        asyncio.run(run_agent("List the first 2 catalogs available"))

Step 5: Configure the LangGraph project

Configure the LangGraph project so the CLI recognizes the workflow graph and environment settings. Create a configuration file that registers the graph for use in LangGraph Studio or during local visualization runs.

Create the configuration file

Create a new file named langgraph.json in your project directory.

Add the following configuration

Use the content below in the langgraph.json file:

{
  "dependencies": ["."],
  "graphs": {
    "agent": "./test.py:graph"
  },
  "env": ".env"
}

Step 6: Prompt AlloyDB using LangGraph (via Connect AI)

Run the LangGraph development server to view and interact with your workflow in LangGraph Studio. This allows direct visualization of how the agent processes prompts, invokes tools, and retrieves AlloyDB data through the MCP server.

Start the LangGraph development server

Open a terminal in your project directory and run:

langgraph dev

Access the Studio interface

After the server starts, LangGraph launches a local API and provides a link to the Studio UI:

https://smith.langchain.com/studio/?baseUrl=http://127.0.0.1:2024

Ideally, the link opens automatically when the command is run. If not, open this link in your browser to load the LangGraph Studio dashboard.

Interact with the agent

In the Studio interface, enter a natural language prompt such as:

Show all AlloyDB tables available in my catalog

LangGraph displays a real-time visualization of the agent's reasoning flow, showing how it interprets the prompt, calls the appropriate MCP tools, and retrieves live data from AlloyDB.

Query and visualize the AlloyDB data (contd.)

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