If you use Google’s Gemini CLI, you have until June 18, 2026 to migrate. After that date, consumer Gemini CLI access ends — and if you’re using the Gemini Code Assist GitHub app, it’s deprecated June 18 and fully shuts down July 17. This isn’t a soft deprecation with years of runway. It’s a hard cutoff.

The replacement is Google Antigravity CLI, command: agy. Here’s what you need to know.

Why Google Is Making This Change

Google shipped Gemini CLI in 2025 and it gathered serious adoption: over 100,000 GitHub stars, 6,000 merged pull requests, and millions of users. But the original design targeted simpler agentic workflows, and developers outgrew it.

The new reality is multi-agent: workflows where multiple agents communicate, split work, and share a unified backend. Gemini CLI was designed as a standalone terminal interface. Antigravity CLI is built on Google’s unified Antigravity platform — the same infrastructure backing broader Google Cloud agent tooling — enabling coordination between agents rather than a single-agent terminal experience.

As Google’s announcement put it: “Your workflows have simply outgrown those early days of 2025.”

What Is Antigravity CLI?

Antigravity CLI (agy) is:

  • Built in Go — fast, single binary, minimal dependencies
  • Backend-unified — shares infrastructure with the broader Antigravity agent platform
  • Multi-agent aware — supports async background agent workflows and agent-to-agent communication
  • Migration-assisted — includes automatic migration tooling for skills, hooks, and extensions

Enterprise Gemini Code Assist customers are not affected — this migration applies only to consumer/developer Gemini CLI users.

Before You Start: What to Audit

Before running any migration, take a few minutes to inventory what you’re currently using:

  1. Installed skills/extensions: Run gemini skills list or check your ~/.gemini/ config directory to enumerate what you’ve built or installed
  2. Custom hooks: Review any pre/post command hooks you’ve configured
  3. Workflows and scripts: Check any shell scripts or CI configurations that invoke gemini commands
  4. API key configuration: Note where your Gemini API credentials are stored

This audit will tell you the scope of your migration before you start.

The Migration Process

Google has built automatic migration tooling into Antigravity CLI. The general approach is:

  1. Install Antigravity CLI — available at antigravity.google with installation instructions for macOS, Linux, and Windows
  2. Run the migration assistant — Antigravity CLI includes tooling to detect existing Gemini CLI configurations and migrate them
  3. Verify your skills and hooks migrated correctly by testing the workflows you use most
  4. Update any scripts that reference gemini commands to use agy equivalents

Important accuracy note: Specific command flags and migration subcommands should be verified against the official Antigravity CLI documentation and Google Developers Blog announcement. The exact syntax may differ from what you’d expect based on Gemini CLI. Do not assume one-to-one command equivalence without verifying.

Key Dates

Date Event
May 19, 2026 Google announced the migration
June 18, 2026 Consumer Gemini CLI access ends; Gemini Code Assist GitHub app deprecated
July 17, 2026 Gemini Code Assist GitHub app fully shut down

What Won’t Change

Google has committed to making Antigravity CLI handle the same agentic terminal workflows that made Gemini CLI popular. The promise is continuity for your day-to-day developer workflows, with the upside of multi-agent capabilities you couldn’t get before.

The weekly release cadence that Gemini CLI users appreciated is continuing. And for users of MCP-based integrations, Antigravity CLI’s integration with Google’s broader platform means the tooling should feel familiar.

Enterprise Users: You’re Fine (For Now)

If you’re using Google’s enterprise Gemini Code Assist (the paid, enterprise-tier product), this deprecation doesn’t affect you. Google explicitly carved out enterprise users from the June 18 consumer cutoff.

That said, it’s worth watching for future announcements about enterprise migration timelines. Antigravity CLI is clearly where Google is concentrating development resources.

What Happens If You Don’t Migrate?

After June 18, your Gemini CLI commands stop working. Any automated pipelines, CI/CD workflows, or scripts that rely on gemini will fail silently or throw errors. The Gemini Code Assist GitHub app loses integration functionality on the same date.

Given that the migration tooling is designed to be automatic, there’s no good reason to wait until the deadline. Start now, give yourself time to catch any edge cases, and have a few days of buffer before June 18.

Getting Help

Sources

  1. Google Developers Blog — “An important update: Transitioning Gemini CLI to Antigravity CLI” (May 19, 2026)
  2. Antigravity CLI — Official Product Page
  3. Google Cloud Blog — Antigravity CLI Announcement
  4. GitHub Discussions — google-gemini/gemini-cli

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