How to Use the Vonage MCP in LangChain

Q: How does Vonage integrate with LangChain for SMS?

You use the sendsms tool to send messages. Your agent handles the entire sequence: checking balance, getting pricing, and finally executing the send action.

Q: Can I use Vonage to manage WhatsApp through LangChain?

Yes. Your agent can call sendwhatsappmessage, provided you supply a verified WhatsApp Business Number as the sender. This keeps the messaging flow within your defined LangChain structure.

Q: If I use Vonage with LangChain, how do I check pricing?

You call getcountrypricing to retrieve outbound SMS rates for any given country using its ISO 3166-1 alpha-2 code. This output is immediately usable in subsequent steps.

Q: How does Vonage handle number updates when paired with LangChain?

You use the updatenumberwebhook tool to change the inbound SMS callback URL for a virtual number, ensuring that any incoming communications point back to your designated endpoint.

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Create your Vinkius account to connect Vonage to LangChain and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Vonage with LangChain

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Claude

Perplexity

Send Messages via MCP Server

You can chain a sequence of communications. First, check the available funds by calling `get_account_balance`. Then, use that data to decide if an outgoing message is feasible. After confirming balance, you send the actual communication. For instance, calling `send_sms` lets your agent dispatch an outbound SMS using a specified sender name and E.164 target number.

Manage Identity Verification

The chain handles complex authentication flows automatically. Your agent can start the process by calling `start_verification`, which kicks off sending an OTP code to a target number. If the user submits a code, the next step in the chain calls `check_verification_code`. This validates the input and allows your agent to proceed or abort using `cancel_verification_request`.

List and Manage Numbers

Need to know what numbers are available? The agent uses `list_rented_numbers` to pull a full roster of virtual phone lines assigned to the account. This output can then feed into another step, like running pricing checks with `get_country_pricing`, ensuring your overall workflow knows exactly which geographical codes you're dealing with before sending anything.

Setup guide

Set up Vonage MCP in LangChain

Prerequisites

Python 3.10+ installed
langchain-mcp-adapters + langgraph packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run pip install langchain-mcp-adapters langgraph langchain-openai. The MCP adapters package converts MCP tools into native LangChain BaseTool objects.
2

Connect via HTTP transport
Use MultiServerMCPClient with "transport": "http" pointing to your Vinkius endpoint. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Create a ReAct agent
Pass the discovered tools to create_react_agent() from LangGraph. The agent automatically routes Vonage tool calls through the MCP protocol.
4

Run with any LLM
Swap ChatOpenAI for ChatAnthropic, ChatGoogleGenerativeAI, or any LangChain-compatible model. The MCP tools work identically across all providers.

agent.py

from langchain_mcp_adapters.client import MultiServerMCPClient
from langgraph.prebuilt import create_react_agent
from langchain_openai import ChatOpenAI

async with MultiServerMCPClient({
    "vonage-mcp": {
        "transport": "http",
        "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
    }
}) as client:
    tools = client.get_tools()

    agent = create_react_agent(
        ChatOpenAI(model="gpt-4o"),
        tools,
    )
    result = await agent.ainvoke({
        "messages": "List recent Vonage transactions"
    })
    print(result["messages"][-1].content)

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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Vonage. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about Vonage MCP in LangChain

You use the `send_sms` tool to send messages. Your agent handles the entire sequence: checking balance, getting pricing, and finally executing the send action.

The server manages various types of communication data, including phone numbers (E.164 format), account credits, and verification codes.

Yes. Your agent can call `send_whatsapp_message`, provided you supply a verified WhatsApp Business Number as the sender. This keeps the messaging flow within your defined LangChain structure.

You call `get_country_pricing` to retrieve outbound SMS rates for any given country using its ISO 3166-1 alpha-2 code. This output is immediately usable in subsequent steps.

You use the `update_number_webhook` tool to change the inbound SMS callback URL for a virtual number, ensuring that any incoming communications point back to your designated endpoint.

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