Antigravity CLI

What is Antigravity CLI?

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.

What does Antigravity CLI do?

Antigravity CLI installs locally via a one-line shell script and runs as agy, a Terminal User Interface optimized for keyboard-driven workflows and remote SSH sessions. It authenticates through a Google Sign-In flow backed by the system keyring, auto-detects SSH sessions, and can connect to a GCP project for enterprise billing. Its standout feature is Subagents: multiple agents work concurrently on background tasks inside one session, splitting up a larger job instead of running everything as one linear conversation — the capability Google's own transition announcement cites as the reason for the rebuild ("developers now need multiple agents communicating with each other to split up the work"). Slash commands give quick access to plugins (Gemini CLI's old "Extensions" are now called "Antigravity plugins"), MCP servers, skills and hooks — Google says these four building blocks carry over from Gemini CLI, though it has publicly acknowledged Antigravity CLI does not have full feature parity with Gemini CLI on day one. Model access is unusually broad for a Google-built tool: the free Individual tier includes Gemini 3.5 Flash and Gemini 3.1 Pro alongside Claude Sonnet and Opus 4.6. As of this listing's research date, Antigravity CLI does not yet support the Agent Client Protocol (ACP) that lets an agent run inside a third-party editor — an open GitHub feature request (#31) was still unresolved, unlike Gemini CLI, which shipped its own ACP mode.

How Antigravity CLI works

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

Who is Antigravity CLI 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

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.

What are Antigravity CLI's 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.

What does Antigravity CLI integrate with?

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

Why use Antigravity CLI?

• The only major terminal coding agent in this index whose free tier bundles both the vendor's own frontier models and a rival's (Claude Sonnet & Opus 4.6) at $0/month.
• Subagents let you run genuinely concurrent background work instead of one linear session — a structural capability most terminal agents here don't have.
• Backed by Google's own infrastructure, with a straight upgrade path to Google AI Pro/Ultra for higher quota instead of a separate vendor relationship.

Pros & cons

Antigravity CLI pricing

Free — Google AI Pro ~$19.99/mo — Google AI Ultra ~$99.99+/mo — Organization custom

• IndividualFree / month
• Google AI Pro~$19.99 / month
• Google AI Ultra~$99.99+ / month
• OrganizationCustom / consumption-based

See current pricing on antigravity.google ↗Compare Antigravity CLI alternatives →

Antigravity CLI review

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.

Google's forced replacement for the now-sunset Gemini CLI — a genuinely generous free multi-model tier, but closed-source and not yet at feature parity.

Frequently asked questions