# Antigravity CLI — Google's terminal-native coding agent that replaced the open-source Gemini CLI in June 2026 — same Antigravity 2.0 agent core, now closed-source and tied to a Google AI subscription.

> Source: The Agents Index — https://theagentsindex.com/antigravity-cli (structured, researched, re-verified)
> Facts last verified: 2026-07-28

Antigravity CLI is Google's terminal-native AI coding agent, launched at Google I/O on May 19, 2026 as the successor to Gemini CLI. Google fully sunset Gemini CLI for free and paid consumer users on June 18, 2026 — only Gemini Code Assist Standard/Enterprise licensees and Gemini Enterprise Agent Platform API-key customers kept uninterrupted access to the old tool — pushing the entire consumer and prosumer developer base onto Antigravity CLI instead. The CLI shares its agent core with Antigravity 2.0, Google's broader agent-first development platform (which also ships a desktop app), so a session started in the terminal can be exported into the GUI app. Unlike Gemini CLI, which shipped under an Apache 2.0 license with its full source on GitHub, Antigravity CLI's public repository (google-antigravity/antigravity-cli) carries no LICENSE file — Google has not stated whether it will remain open source, and a GitHub issue asking directly (#27304) had no official answer as of this listing's research date.

| Fact | Value |
| --- | --- |
| Website | https://antigravity.google/product/antigravity-cli |
| Pricing | Free — Google AI Pro ~$19.99/mo — Google AI Ultra ~$99.99+/mo — Organization custom |
| API | Yes |
| Best for | Developers already inside the Google ecosystem (Google AI subscription, GCP billing) who want a free terminal agent with both Gemini and Claude model access, especially anyone migrating off a now-sunset Gemini CLI workflow. |
| Not for | Developers who specifically valued Gemini CLI's open-source license, or teams that need ACP compatibility to run their agent inside a third-party editor today. |

## Pricing

| Tier | Price |
| --- | --- |
| Individual | Free / month |
| Google AI Pro | ~$19.99 / month |
| Google AI Ultra | ~$99.99+ / month |
| Organization | Custom / consumption-based |

## Verdict

Antigravity CLI is Google's answer to "what replaces a sunset open-source tool" — and the honest read is a mixed one. The free tier is genuinely generous (unlimited tab completions and command requests, plus a rare bundle of both Gemini and Claude frontier models at $0/month), and Subagents give it real concurrent-execution capability most terminal agents in this index lack. But it arrived by force, not choice: free and personal Gemini CLI users got roughly 30 days' notice before their old tool stopped working entirely, the replacement isn't fully at feature parity yet, and — unlike its predecessor — it isn't open source. Pick it if you're already on Google's stack and want the free multi-model access; look elsewhere if an open license or ACP compatibility with your editor of choice is a hard requirement.

## How it works

1. Install Antigravity CLI locally with a one-line shell script and authenticate through a Google Sign-In flow backed by the system keyring.
2. Run `agy`, a keyboard-driven terminal interface that auto-detects SSH sessions and can connect to a GCP project for enterprise billing.
3. Use slash commands to invoke plugins, MCP servers, skills and hooks, and delegate larger jobs to concurrently-working Subagents inside one session.
4. Export a terminal session into the Antigravity 2.0 desktop app, since both share the same underlying agent core.

## Who it's for

- Developers already inside the Google ecosystem, with a Google AI subscription or GCP billing, who want a free terminal coding agent
- Former Gemini CLI users migrating off a now-sunset tool who need a replacement carrying over plugins, MCP servers, skills and hooks
- Developers who want both Gemini and Claude frontier models available in one free terminal session instead of paying for two separate subscriptions

## Strengths and weaknesses

- ✓ The only terminal coding agent in this index whose free tier includes a rival vendor's frontier models (Claude Sonnet & Opus 4.6) alongside its own (Gemini 3.5 Flash, Gemini 3.1 Pro) — confirmed directly on Google's own pricing page.
- ✓ Subagents run genuinely concurrent background work in one session — Google states this exact capability ("multiple agents communicating with each other to split up the work") was the reason it rebuilt Gemini CLI into Antigravity CLI.
- ✓ A real, if young, open community around the CLI itself: 1.7k GitHub stars and 145 forks on its public repo within roughly two months of the May 2026 announcement, plus a working migration path — Agent Skills, Hooks, Subagents and Extensions all carry over from Gemini CLI.
- ✗ Unlike its Apache-2.0-licensed predecessor, Antigravity CLI's public GitHub repo ships with no LICENSE file, and a direct GitHub issue asking Google to confirm open-source status (#27304) had no official answer as of this listing's research date — a real step backward in openness for anyone who chose Gemini CLI specifically because it was open source.
- ✗ Google has publicly acknowledged Antigravity CLI does not have full feature parity with Gemini CLI on day one, and free/personal Gemini CLI users had only a roughly 30-day window (announced May 19, cutoff June 18, 2026) to migrate — developers who built tooling around specific Gemini CLI behaviors reported real breakage.
- ✗ No support yet for the Agent Client Protocol (ACP) that lets an agent run inside a third-party editor — an open GitHub feature request (#31) remained unresolved as of this listing's research date, unlike Gemini CLI, which shipped its own ACP mode.
- ⚠ Not yet open source — no LICENSE file in its public GitHub repo, unlike the Apache-2.0 Gemini CLI it replaces, and Google has not confirmed whether that will change.
- ⚠ No Agent Client Protocol (ACP) support yet, so — unlike Gemini CLI — it can't currently run inside a third-party ACP editor.

## Key features

- **Subagents** — Multiple agents work concurrently on background tasks in one session — the capability Google cites as the reason it rebuilt Gemini CLI into Antigravity CLI.
- **Multi-vendor free tier** — The $0/month Individual tier includes Gemini 3.5 Flash and Gemini 3.1 Pro alongside Claude Sonnet and Opus 4.6 — a rival's models shipped free inside a Google CLI.
- **Shared core with Antigravity 2.0** — The CLI and the Antigravity desktop app share the same agent engine, so a terminal session can be exported into the GUI app.
- **Slash-command plugins, MCP, skills and hooks** — Gemini CLI's "Extensions" carry over as "Antigravity plugins," alongside MCP server support, skills and hooks.
- **SSH-aware TUI** — Auto-detects remote SSH sessions and runs a lightweight terminal interface built for keyboard-driven, low-overhead workflows.
- **GCP-backed enterprise billing** — Organization plans connect to a Google Cloud project for consumption-based billing under Google Cloud Terms.

## Use cases

- **Migrating off a sunset Gemini CLI workflow** — A team that scripted Gemini CLI into CI or day-to-day terminal work migrates to Antigravity CLI to keep a Google-model-based agent working past the June 18, 2026 cutoff.
- **Splitting a large ticket across concurrent subagents** — A developer delegates a multi-file refactor where separate subagents work in parallel inside one session instead of one linear conversation.
- **Working over SSH on a remote dev box** — The TUI's SSH detection and lightweight footprint suit a cloud workstation or remote pair-programming session better than a GUI IDE agent.

## Integrations

Google Cloud (GCP) billing for Organization plans · MCP servers · Antigravity plugins (formerly Gemini CLI Extensions) · Antigravity 2.0 desktop app (shared session export)

## Sources

- https://developers.googleblog.com/an-important-update-transitioning-gemini-cli-to-antigravity-cli/
- https://antigravity.google/product/antigravity-cli
- https://antigravity.google/pricing
- https://antigravity.google/docs/plans
- https://github.com/google-antigravity/antigravity-cli
- https://github.com/google-gemini/gemini-cli/issues/27304
- https://github.com/google-antigravity/antigravity-cli/issues/31
- https://www.theregister.com/ai-ml/2026/05/20/bye-bye-gemini-cli-google-nudges-devs-toward-antigravity/