Gemini CLI to Antigravity CLI: Migration Guide

Quick answer: Gemini CLI stopped working for free, Pro, and Ultra users on June 18, 2026. The replacement is Antigravity CLI. Your SKILL.md skills transfer to any SKILL.md-compatible agent — Antigravity, Claude Code, or OpenCode.

Google shut down Gemini CLI on June 18, 2026. If you were using it for terminal-based AI coding, you need a new tool. Here are your options.

What happened

Google announced at I/O 2026 that Gemini CLI and Gemini Code Assist IDE extensions would stop serving requests for free, Pro, and Ultra users. The shutdown had no grace period. CI/CD pipelines, shell scripts, and automations calling the gemini command broke immediately.

Enterprise users with Gemini Code Assist Standard or Enterprise licenses through Google Cloud are not affected.

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Option 1: Antigravity CLI

Antigravity CLI is Google's official replacement. It is a complete rewrite in Go (Gemini CLI was Node.js) with async workflows and a unified architecture. You invoke it with the agy command instead of gemini.

Important: Antigravity does not have full feature parity with Gemini CLI at launch. Google's own announcement states there will not be 1:1 feature parity immediately. Subagents and extensions are being ported, but other features are still in progress.

Antigravity is free during preview. It supports multi-agent orchestration, Chrome browser automation, and access to Gemini 3.x models. For skills setup, see the Antigravity skills guide.

Option 2: Claude Code

For developers who want the highest code quality, Claude Code is the strongest migration path. It runs in the terminal like Gemini CLI did, uses Anthropic's Opus 4.7 (the top-rated coding model), and has the largest SKILL.md ecosystem.

Any SKILL.md skills you were using with Gemini CLI work in Claude Code without modification. Drop them in your .skills/ directory. See the Claude Code installation guide.

Cost: $20/month with Claude Pro. Free tier available.

Option 3: OpenCode

For developers who want to keep using Gemini models without Gemini CLI, OpenCode is the best path. It supports Gemini models via Google's AI API alongside 74+ other providers. You can run Gemini when needed and fall back to Claude or GPT when tasks require it.

OpenCode is free and open-source. Install it, configure your Gemini API key, and your existing SKILL.md skills transfer directly. There is even an opencode-antigravity-auth plugin that lets OpenCode use Antigravity's rate limits and model access.

See the OpenCode skills guide.

Migrating your SKILL.md skills

The good news: SKILL.md is an open standard that works across all compatible agents. Your existing skills do not need any modification. The same SKILL.md file works in Antigravity, Claude Code, OpenCode, Cursor, Codex CLI, and 20+ other agents.

If you need to find replacement skills or add new ones for your new agent, browse the Agensi marketplace with over 1,600 skills. Filter by your new agent to find compatible options.

For a full comparison of all terminal agents to help you decide, see best AI coding assistants 2026.