Antigravity Link (VS Code Extension)

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What's new in v1.0.20 — Security: removed child_process dependency entirely; debug endpoints now require auth; localhost guard on all LS RPC calls. See CHANGELOG.

Contents

• Demo
• What you get
• Installation
• Prerequisites
• Quick start
• Commands
• Settings
• For agent builders
• How it works
• Account safety
• Troubleshooting
• FAQ
• Internationalization and accessibility
• Contributing
• API reference
• MCP server reference

You're running an Antigravity session and need to step away from your desk. The AI is mid-generation. You want to monitor it, redirect it, upload a file, or just read what it wrote from your phone, without coming back to your computer.

Antigravity Link makes that possible. Scan a QR code and your phone becomes a live mirror of the active chat: read responses as they stream, send messages, stop generation, upload files, dictate via voice, and switch between multiple Antigravity windows all from a mobile browser, on your local network.

For automation, the extension also exposes a local HTTP API and an MCP server so agents and external tools can drive Antigravity sessions programmatically.

Demo

https://github.com/user-attachments/assets/43c7d029-a598-474f-949e-5da333c9a3f2

What you get

• Live mirror of the active Antigravity chat — read and interact from your phone.
• File upload into the active Antigravity chat.
• Voice-to-text input from mobile (HTTPS required for mic permissions).
• Stop generation from your phone with a dedicated stop chip.
• Active instance switching for multiple Antigravity windows.
• Local HTTP API for automation and integrations (see API).
• MCP server for AI assistant integration (see MCP server).
• Local-only server with token authentication.
• Interface available in 16 languages with automatic detection and RTL support.

Installation

Install from the Antigravity extensions marketplace: search Antigravity Link or install directly from Open VSX.

Prerequisites

• Antigravity IDE installed and running.
• A phone and computer on the same Wi-Fi network.
• Antigravity launched with the remote debugging flag. This is required for the extension to discover and connect to your session. See the launch command in Quick start below.

Quick start

1. Start Antigravity with remote debugging enabled. This is required; sessions launched without this flag are not discoverable by the extension.

Windows:

& "C:\Users\<username>\AppData\Local\Programs\Antigravity IDE\Antigravity IDE.exe" --remote-debugging-port=9000

macOS:

open -a "Antigravity IDE" --args --remote-debugging-port=9000

Linux:

antigravity-ide --remote-debugging-port=9000

Multiple Antigravity sessions are supported, but every window must be launched with this command.

2. In VS Code, run: Antigravity Link: Start Server

3. Then run: Antigravity Link: Show QR Code

4. Scan the QR code with your phone. Your mobile UI is ready.

5. Your phone may warn that the connection is unsafe because the certificate is self-signed. This is expected for local HTTPS. Use your browser's "Advanced" or similar option to proceed (wording differs between Safari/Chrome/Firefox).

Commands

Settings

For agent builders

If you want to integrate quickly, use this sequence:

1. Start the extension server and copy the token from the QR URL (?token=...).
2. Use either MCP tools (mcp-server.mjs) or direct HTTP calls against https://localhost:3000.
3. Validate control flow with /snapshot, /send, and /stop.

OpenAPI example:

curl -k https://localhost:3000/snapshot \
  -H "Authorization: Bearer <token>"

MCP client configuration example:

{
  "antigravity-link": {
    "command": "node",
    "args": ["<extension-dir>/mcp-server.mjs"],
    "env": {
      "AG_BRIDGE_URL": "https://localhost:3000",
      "AG_BRIDGE_TOKEN": "<token>"
    }
  }
}

Replace <extension-dir> with the path to the installed extension:

• Windows: %USERPROFILE%\.antigravity-ide\extensions\cafetechne.antigravity-link-extension-1.0.20
• macOS/Linux: ~/.antigravity-ide/extensions/cafetechne.antigravity-link-extension-1.0.20

How it works (high level)

• The extension starts a local server (HTTP or HTTPS).
• It discovers Antigravity targets via the Chrome DevTools Protocol (CDP).
• Your phone connects to the mobile UI and sends upload/command requests.
• The extension injects into the selected chat target and saves files to uploads/.

Account safety

Antigravity Link has no known ban cases and is designed to stay that way.

The extension works by connecting to a debug port that Antigravity exposes on your own machine the same Chrome DevTools Protocol used by VS Code's built-in debugger and browser devtools. It reads your local UI and simulates keypresses and clicks, exactly as if you were sitting at your keyboard.

What this means in practice:

• All network activity is local. The extension communicates only with: your phone on the LAN via the HTTPS server it starts; Antigravity IDE's Chrome DevTools Protocol port on localhost:9000; and Antigravity's Language Server process on 127.0.0.1 for the stop-generation RPC. No data is sent to Google's servers or any external service beyond what Antigravity itself sends.
• Nothing is injected into Antigravity's network traffic. The extension reads your screen and types into your editor it does not intercept or modify API calls.
• No Antigravity files are modified. There are no patches, hooks, or binary modifications.
• The server runs entirely on your machine. Your prompts, chat history, and files never leave your local network unless you explicitly expose the server externally.
• No data is sent to third-party services by this extension.

The source code is MIT-licensed and fully auditable: https://github.com/cafeTechne/antigravity-link-extension

Troubleshooting

• No instances found: Make sure every Antigravity window was launched with the --remote-debugging-port command shown above.
• Can't connect from mobile: Ensure your phone an