Voice WhatsApp Agent with Google Antigravity · The Complete Hebrew Guide [2026].

A client sends you a voice message on WhatsApp at two in the morning. Within seconds, they receive a voice message back in Hebrew, in a natural voice, answering them directly from your business knowledge base. You are sleeping. The agent is working. This is exactly what Gal Habkin built live in the fourth session of the workshop · from scratch, without writing a single line of code, in under an hour. An AI agent that speaks, hears, remembers, and connects to a data source. An automation agency would charge between 5,000 and 6,000 NIS for it. Here, it is built with free tools accessible to everyone. This guide breaks down the entire process · the core tool (Google Antigravity), the WhatsApp connection (Green API), the memory (Supabase), the voice (ElevenLabs), and the brain (Grok). Every step, every key, every concept. In Hebrew, without a technical background.

What the agent will know how to do by the end of the guide

• Receive WhatsApp messages · text or voice recording · and return an answer
• Talk to you in a natural Hebrew voice, like a real representative
• Remember who you are and previous conversations · it has a database
• Answer from your knowledge base · website, PDF, Excel, or document that you feed it
• Work 24/7 in the cloud, even when your computer is turned off
• Connect to endless additional tools via API · calendar, images, web search, and more

The idea · you are the brain, the agent does the work

Three concepts you must know before starting

The stack · the tools that make up the voice agent

Google Antigravity

The agent · writes the code and connects everything

The core workspace · a new tool from Google that you download to your computer (Mac or Windows). You describe in Hebrew or English what you want, and it writes all the code and assembles the connections. It has two modes · Planning (planning before execution) and Fast (working). It works with Gemini and Claude models. The free version is enough to start. Before installation, you also need to download Node.js (type 'Node' in Google and install · no need to understand what it is).

Tip for agents: Work only in the side chat window. You do not touch the code · the agent writes everything. Drag files and images to it when needed.

Green API

The pipe · connects the agent to WhatsApp

A system that connects a WhatsApp number to the agent · sending and receiving messages, including voice recordings. Register with an email and password (without downloading anything), scan a QR with the phone, and the number is connected. In the free version, you can talk to up to three contacts · enough for testing. For full release · 12 dollars a month. Green API does not have an MCP, so you feed it the documentation manually (or solve it with Context7 · see tool 7).

Tip for agents: To avoid connecting your personal number · buy a pre-paid SIM for ten shekels at any grocery store, activate it once, and connect it as the agent's business number.

Supabase

The memory · the agent's database

A database where all information sits · messages, contacts, conversations. This is the brain that remembers. Register in half a minute, open a new project, and connect to Antigravity via MCP (built-in). Once the agent is connected to the database · it remembers who you are and what you talked about. This is also where you upload the knowledge base (PDF, Excel) that the agent answers from. Completely free to start.

Tip for agents: The connection is made with an Access Token from Account · Access Tokens. Paste it into Antigravity's MCP Servers, and within two clicks the agent is connected to the entire database.

Mastra

The agent wrapper · gives it capabilities

A framework that brings all agent capabilities · how to create an agent, memory, tools. Instead of reading everything, connect it to Antigravity via its MCP (copy the MCP page from the website and drag it to the mcp config.json file). Once it is connected · Antigravity knows how to build a smart agent with memory, which speaks pleasantly and remembers the user.

Tip for agents: After connecting, tell Antigravity: 'Build me a smart agent that will remember the user and recent messages, and connect it to the database'. It builds it by itself.

Grok (xAI)

The brain · the language model driving the agent

The language model of xAI (Elon Musk's company). Chosen because it is cheap, smart, and remembers a lot · but any other model can be used (ChatGPT, Claude, Gemini). Register for the console, get gift credit, and generate an API Key. Paste it to the agent and say which model to use · for example Grok 4.1. Note that the agent uses an up-to-date model · an old model is slower and dumber.

Tip for agents: Good model = model from the last year. If Antigravity puts an old model by mistake · just tell it 'switch to this model' and paste the correct name.

ElevenLabs

The voice · turns text into speech in Hebrew

A system for the entire voice world · voice creation, translation, voice cloning. Here it turns the agent's answers into a natural Hebrew voice message. Register, get monthly gift credits, and generate an API Key under Developers · API Keys. Paste it to the agent, and feed it the Text to Speech documentation. In Hebrew, work with the V3 model.

Tip for agents: Want the agent to send voice only when asked? Tell it that. You can use both text and voice, depending on what is convenient for you at that moment.

Context7

The shortcut · documentation for all tools

An MCP connected to the documentation of many tools. Instead of manually going to each site and copying the guide (like we did with Green API), connect Context7 once · and Antigravity knows how to interface with any tool by itself. Add it to MCP Servers, and that is it. This turns the entire manual process of 'copy documentation, paste to agent' into automatic.

Tip for agents: Context7 only solves the documentation. You will always need to enter the API Keys yourselves · they are unique to you.

Vercel

The home · the agent lives in the cloud 24/7

Free hosting where the project is uploaded. As long as the code is on the computer · the agent works only when the computer is turned on. Import the project in Vercel, wait about 50 seconds, and the agent is active in the cloud around the clock. Vercel is the number one infrastructure company in the world for development · Google, Anthropic, and OpenAI work with it.

Tip for agents: The keys (API Keys) are saved in a secure file named .env. Even when the project is live · no one has access to your keys.

💡 All tools are free to start. The only cost that does come in later is using Grok · and it is truly minor (that is why we chose it). Think of it as an employee you pay almost nothing to and who works 24/7.

The process · from registration until the agent speaks

The AI Master club opens the door for you: a live meeting every week, recordings, and a community. 47 ILS per month, cancel anytime.

Steps to create the voice agent

• Google Antigravity and Node.js · Install them on your computer
• Green API · Register, scan a QR code, and connect a WhatsApp number. Verify that sending and receiving work
• Supabase · Open a database and connect it to Antigravity via MCP · This is the memory
• Mastra · Connect the agent framework via MCP, and ask Antigravity to build a smart agent with memory
• Grok · Generate an API Key and feed it to the agent · This is the brain that drives the conversation
• ElevenLabs · Generate an API Key and feed the Text to Speech documentation · Now the agent speaks in Hebrew
• Knowledge base · Upload the PDF, Excel, or website content to Supabase, and give the agent access
• Vercel · Deploy to the cloud · The agent goes live and works 24/7

⚠️ Stuck? That is part of the process. Antigravity is like ChatGPT · It has conversation memory. Paste the error message (or a screenshot of it) and ask 'what is the next step'. Often it simply says 'my bad' and fixes it on its own. As models advance · mistakes become rarer.

What can be built from here · The sky is the limit

Why code instead of off-the-shelf No-Code tools

All tools in one place

The full list of tools from the meeting · All are free to start

The core agent that writes the code and connects everything

The WhatsApp connection · Sending and receiving, text and voice

The database · The agent's memory

The agent framework · Gives it capabilities

The brain · A cheap and smart language model

The voice · Text to speech in Hebrew

Automatic documentation for all tools

Cloud hosting · The agent lives 24/7

FAQ · Voice WhatsApp agent with Antigravity

No. Google Antigravity writes all the code for you. You talk to it in Hebrew like an employee · Describe what you want, paste API Keys and documentation, and it assembles it. You do not touch code at all.

An API Key is the unique key that gives the agent access to external software. Each software (Green API, Grok, ElevenLabs) generates its own key for you. Without the key, the agent cannot connect. Do not share the key · It is yours alone.

MCP connects the agent to an entire system with the click of a button · It already knows how everything works on its own. When a tool lacks MCP (like Green API), you copy the relevant documentation page to it and it learns from it. Context7 provides automatic documentation for many tools and makes manual copying unnecessary.

The simplest way · Buy a Tokman prepaid card at any grocery store for ten shekels, activate it once on a phone, and connect it as the business number via Green API. Gal recommends this over a virtual number, because a virtual number might be closed or taken away.

Upload the file (PDF, Excel, or website content) to Supabase, and give the agent access to it. You can also put the file in the project and ask Antigravity to upload it to Supabase. From there, the agent answers based on your information.

All tools are free to start. The only cost that comes up in ongoing use is Grok · And it is very minor. In the market, an automation agency charges between 5,000 and 6,000 NIS for such a tool, and here you build it almost for free.

Only after you deploy it to Vercel. As long as the code is on the computer · The agent is active only when the computer is turned on. Deployment to Vercel takes about a minute, is free, and uploads the agent to the cloud where it works 24/7.

This guide is the foundation. In the AI Master club, we build such tools live, meeting after meeting, together · With recordings, prompts, and links ready for copy-paste. If you want to master the world of agents and automations of 2026 · This is the place to start.

Frequently asked questions

Do you need to know how to code to build this agent?

No. Google Antigravity writes all the code for you. You talk to it in Hebrew like an employee · Describe what you want, paste API Keys and documentation, and it assembles it. You do not touch code at all.

What is an API Key anyway and why is it needed for every tool?

An API Key is the unique key that gives the agent access to external software. Each software (Green API, Grok, ElevenLabs) generates its own key for you. Without the key, the agent cannot connect. Do not share the key · It is yours alone.

What is the difference between MCP and documentation?

MCP connects the agent to an entire system with the click of a button · It already knows how everything works on its own. When a tool lacks MCP (like Green API), you copy the relevant documentation page to it and it learns from it. Context7 provides automatic documentation for many tools and makes manual copying unnecessary.

How do you get a WhatsApp number for the agent without connecting your personal number?

The simplest way · Buy a Tokman prepaid card at any grocery store for ten shekels, activate it once on a phone, and connect it as the business number via Green API. Gal recommends this over a virtual number, because a virtual number might be closed or taken away.

How does the agent answer from my knowledge base?

Upload the file (PDF, Excel, or website content) to Supabase, and give the agent access to it. You can also put the file in the project and ask Antigravity to upload it to Supabase. From there, the agent answers based on your information.

How much does it cost to run the agent?

All tools are free to start. The only cost that comes up in ongoing use is Grok · And it is very minor. In the market, an automation agency charges between 5,000 and 6,000 NIS for such a tool, and here you build it almost for free.

Does the agent work even when my computer is turned off?

Only after you deploy it to Vercel. As long as the code is on the computer · The agent is active only when the computer is turned on. Deployment to Vercel takes about a minute, is free, and uploads the agent to the cloud where it works 24/7.