Zeltro › Antigravity CLI in Zeltro: build apps with your Google account, on your own computer

Antigravity CLI in Zeltro

How Zeltro runs Google's Antigravity CLI, the successor to Gemini CLI: sign in with your Google account or use a Gemini API key. What it can't do, and how Zeltro sets it up for you.

Antigravity CLI (agy) is Google's coding agent for the terminal, and the successor to Gemini CLI. It reads your project, edits the files and runs commands. In Zeltro it works inside a project that's already set up, on your own computer, with your Google account.

Connect it with

Your planSign in with Google✓

An API keyGoogle AI Studio✓

A model on your computerNot supported–

Antigravity CLI Google agy Zeltro installs it antigravity.google

Your project in Zeltro

• Runtime and database ready
• AGENTS.md to read
• Live preview

What Zeltro does for Antigravity#

1. Installs it

   Choose Antigravity CLI when Zeltro first opens, or later in Settings → AI Profiles. Zeltro installs it with Google's own install script.

2. Connects it

   Sign in with your Google account, or give it a Gemini API key from Google AI Studio.

3. Hands it a ready project

   Every project already has its runtime, its database and a working .env, plus an AGENTS.md that tells the agent the project's address, database and commands.

4. Runs it beside your app

   Antigravity works in a real terminal next to the live preview, and you write long requests in the message box. It doesn't tell the app when a turn is done yet, so keep an eye on its terminal.

Your Google account or a Gemini key#

Your Google account. Choose "Sign in with my Google plan". The first time agy starts, it opens Google's sign-in, asks for a color scheme and shows Google's terms and data-use screen. Read that screen before you accept: the box for sharing data with Google is ticked by default, and Zeltro leaves that choice to you.

A Gemini API key. Get one from Google AI Studio and choose "Use an API key". Zeltro writes the setting Antigravity needs to use it, and removes it again if you clear the key, so Google sign-in works again.

What it can't do#

Antigravity talks only to Google. It takes no other server, so it can't use OpenRouter or a model on your own computer. If you want those, choose Qwen Code, OpenCode or Aider instead, and keep Antigravity in a second profile for the projects where you want Google's models.

Coming from Gemini CLI#

Google stopped serving Gemini CLI to personal Google accounts (free, AI Pro and AI Ultra) on 18 June 2026. An existing Gemini CLI profile in Zeltro keeps working with a paid Gemini API key, but new profiles use Antigravity. To switch, restart the Zeltro app so it updates, then edit your profile in Settings → AI Profiles and choose Antigravity CLI.

From the terminal#

zeltro ai-set --agent agy                    # sign in with Google the first time you run agy
zeltro ai-set --agent agy --api-key AIza...  # or a Gemini API key

Asking before each change. By default, the AI in each project works without stopping to ask first: the Works without asking switch in the project's panel is on. Switch it off and you approve each step in Antigravity's terminal. Antigravity can't be told to ask for just one run, so with the switch off, its own setting decides. To change Antigravity's own setting for every run, outside Zeltro too, run zeltro ai-unattended, which writes "toolPermission": "always-proceed" into ~/.gemini/antigravity-cli/settings.json.

Questions

Checked 2026-11-09. Other products change often — if something here is out of date, tell us and it gets fixed.