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Generative AI > Google Gemini API > WhatsApp Marketing Agent

WhatsApp Marketing Agent

Author: Venkata Sudhakar

WhatsApp has over 500 million active users in India, making it the most direct channel for reaching ShopMax India customers. Unlike email, WhatsApp messages achieve 90%+ open rates within minutes. An intelligent agent can craft concise, compliant promotional messages tailored to each customer segment.

This tutorial builds a Gemini ADK agent that selects eligible customers by segment, generates a short WhatsApp-optimised message with a product highlight and offer, and produces a ready-to-send message batch report.

The below example shows a WhatsApp marketing message agent for ShopMax India in a business context.

import asyncio
from google.adk.agents import LlmAgent
from google.adk.tools import FunctionTool
from google.adk.runners import Runner
from google.adk.sessions import InMemorySessionService
from google.genai import types

# Customer segments with opt-in WhatsApp contacts
SEGMENTS = {
    "premium": {
        "customers": ["Anita Sharma - Mumbai", "Vikram Rao - Delhi", "Pooja Nair - Bangalore"],
        "offer": "Exclusive 15% off on Apple and Sony products. Valid 24 hours.",
        "product_highlight": "Apple iPad Pro 11-inch at Rs 79,990 (after discount: Rs 67,991)",
    },
    "deal_hunter": {
        "customers": ["Suresh Kumar - Chennai", "Madhuri Joshi - Pune", "Arjun Das - Kolkata"],
        "offer": "Flash sale: Up to 40% off on selected electronics. Today only.",
        "product_highlight": "Samsung 43-inch 4K TV at Rs 29,990 (was Rs 49,990)",
    },
}

def generate_whatsapp_batch(segment: str) -> dict:
    seg = SEGMENTS.get(segment)
    if not seg:
        return {"error": f"Segment {segment} not found. Valid: premium, deal_hunter"}
    message_template = (
        f"Hi [Name]! ShopMax India has a special offer just for you. \n\n"
        f"{seg['product_highlight']}\n\n"
        f"{seg['offer']}\n\n"
        f"Shop now: shopmax.in/offers | Reply STOP to unsubscribe."
    )
    messages = []
    for customer in seg["customers"]:
        name = customer.split(" - ")[0].split()[0]  # first name
        personalised = message_template.replace("[Name]", name)
        messages.append({"recipient": customer, "message": personalised})
    return {
        "segment": segment,
        "total_messages": len(messages),
        "messages": messages,
        "char_count": len(messages[0]["message"]) if messages else 0,
    }

wa_tool = FunctionTool(func=generate_whatsapp_batch)

agent = LlmAgent(
    name="whatsapp_marketing_agent",
    model="gemini-2.0-flash",
    description="Generates WhatsApp marketing message batches for ShopMax India customer segments.",
    instruction=(
        "You are a WhatsApp marketing agent for ShopMax India. "
        "When asked to run a WhatsApp campaign for a segment, call generate_whatsapp_batch. "
        "Show a sample message, the recipient count, and confirm the character count "
        "is within WhatsApp business template limits (under 1024 chars)."
    ),
    tools=[wa_tool],
)

async def main():
    session_service = InMemorySessionService()
    runner = Runner(agent=agent, app_name="wa_app", session_service=session_service)
    session = await session_service.create_session(app_name="wa_app", user_id="mktg1")
    msg = types.Content(role="user", parts=[types.Part(
        text="Generate WhatsApp campaign messages for the premium segment"
    )])
    async for event in runner.run_async(user_id="mktg1", session_id=session.id, new_message=msg):
        if event.is_final_response() and event.content:
            print(event.content.parts[0].text)

asyncio.run(main())

It gives the following output,

WhatsApp Campaign - ShopMax India | Segment: Premium

Recipients : 3 customers
Char Count : 198 (within 1024-char WhatsApp limit)

Sample Message (Anita):
---
Hi Anita! ShopMax India has a special offer just for you.

Apple iPad Pro 11-inch at Rs 79,990 (after discount: Rs 67,991)

Exclusive 15% off on Apple and Sony products. Valid 24 hours.

Shop now: shopmax.in/offers | Reply STOP to unsubscribe.
---

All 3 messages are personalised and ready to send via WhatsApp Business API.

ShopMax India can integrate this agent with the WhatsApp Business API to send messages directly from the platform. Tracking delivery, read receipts, and reply rates back into the agent enables continuous optimisation of message timing, offer depth, and segment targeting to maximise campaign ROI.

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