How to Use the WhatsApp Message Sender MCP in OpenAI Agents SDK

Q: How do I get the OpenAI Agents SDK to send a WhatsApp Message Sender notification?

You call the sendwhatsappmessage tool within your agent's workflow. You specify the recipient number and the message body, and the agent handles the API interaction for you.

Send WhatsApp Messages with OpenAI Agents SDK.

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Connect WhatsApp Message Sender MCP to OpenAI Agents SDK

Create your Vinkius account to connect WhatsApp Message Sender to OpenAI Agents SDK 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 WhatsApp Message Sender with OpenAI Agents SDK

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Initiate Direct Messaging via MCP Server

The `send_whatsapp_message` tool lets your agent send a text message directly to any number. You just supply the destination phone number in E.164 format and the body text, and it gets sent. This is crucial for giving your OpenAI Agents SDK deployment immediate customer access without needing a separate messaging service.

Guaranteeing Production Safety

Since you're building production systems with the OpenAI Agents SDK, this MCP Server works within built-in guardrails. These rails validate every agent action before it runs, stopping potential errors before they hit WhatsApp. It handles the necessary handoffs between specialized agents, making sure your message sending process stays safe and compliant.

Handling Phone Number Formatting

When using `send_whatsapp_message`, remember that the 'to' parameter requires the phone number in E.164 format—no plus signs allowed. This keeps your agent calls clean and reliable. The tool handles this strict formatting requirement, so you don't have to worry about dialing codes breaking your logic.

Setup guide

Set up WhatsApp Message Sender MCP in OpenAI Agents SDK

Prerequisites

Python 3.10+ installed
openai-agents package (pip install openai-agents)
Active Vinkius subscription with a valid endpoint token

1

Install the SDK

Run pip install openai-agents to install the OpenAI Agents SDK. The MCP integration is built-in — no extra dependencies needed.
2

Connect via SSE transport

Use MCPServerSse with your Vinkius endpoint URL. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. The SDK auto-discovers all WhatsApp Message Sender tools at runtime.
3

Create your Agent

Pass the MCP to Agent(mcp_servers=[server]). The agent receives WhatsApp Message Sender tools as native definitions — JSON schemas resolve automatically.
4

Run the agent

Call Runner.run(agent, prompt) to execute. The agent invokes the appropriate WhatsApp Message Sender tools and returns structured results. Copy the full example on the right to get started.

agent.py

import asyncio
from agents import Agent, Runner
from agents.mcp import MCPServerSse

async def main():
    async with MCPServerSse(
        url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    ) as server:
        agent = Agent(
            name="WhatsApp Message Sender Agent",
            instructions="You have access to WhatsApp Message Sender tools.",
            mcp_servers=[server],
        )
        result = await Runner.run(agent, "List recent transactions")
        print(result.final_output)

asyncio.run(main())

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Common questions about WhatsApp Message Sender MCP in OpenAI Agents SDK

You call the `send_whatsapp_message` tool within your agent's workflow. You specify the recipient number and the message body, and the agent handles the API interaction for you.

The MCP Server sends messages via the Meta Cloud API. Keep in mind that sending outside of the 24-hour window usually requires pre-approved templates on the Meta side, or it might fail.

This server touches customer phone numbers in E.164 format and text message bodies. The agent uses this information to construct the `send_whatsapp_message` call.

Yes, because it's integrated into a production agent system using the OpenAI Agents SDK. The built-in guardrails help ensure that sending thousands of messages remains controlled and safe.

You can get full tracing via the OpenAI dashboard. This lets you see exactly when your agent invoked `send_whatsapp_message`, who it targeted, and what the outcome was.

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