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Google AI Coding Tools — Gemini CLI, Antigravity & Beyond
Google's AI coding ecosystem has evolved rapidly. Gemini CLI launched as an open-source terminal agent (106K GitHub stars). Antigravity followed as a full agentic development platform with an IDE, CLI, and SDK. And in mid-2026, Gemini CLI is being merged into Antigravity CLI. This course covers the entire ecosystem as it exists today, with clear migration paths where platforms are in transition.
Five days, from installing Gemini CLI to building custom agents with the Antigravity SDK. Every command and feature is verified against current documentation. Given the pace of change in this ecosystem, the resource links at the end of each lesson are the authoritative reference for features that have evolved since publication.
Before you start
| Tool | Version | Purpose | Install |
|---|---|---|---|
| Node.js | 20.0+ | Gemini CLI runtime | nodejs.org |
| Google account | — | Authentication for all tools | accounts.google.com |
| Gemini CLI | v0.51+ | Terminal agent (Days 1-2) | npm install -g @google/gemini-cli |
| Antigravity | 2.0+ | IDE + CLI + SDK (Days 3-5) | antigravity.google/download |
bash
# Install Gemini CLI
npm install -g @google/gemini-cli
# Authenticate
gemini
# Or run without installing
npx @google/gemini-cliImportant: Gemini CLI is transitioning to Antigravity CLI on June 18, 2026. The skills and workflows you learn on Gemini CLI transfer directly. The course covers both platforms and notes where they differ.
The arc
Day 1 — Gemini CLI: Installation & First Use covers installation, authentication, the REPL, slash commands, GEMINI.md context files, and completing real coding tasks in the terminal.
Day 2 — Gemini CLI: Advanced Features covers MCP servers, custom slash commands, extensions, sandbox mode, Docker execution, and the three release channels.
Day 3 — Antigravity: IDE & Platform covers the Antigravity IDE (VS Code fork), the agent manager, Projects for grouping conversations, artifacts, and the deep codebase understanding engine.
Day 4 — Antigravity: CLI, SDK & Agents covers the Antigravity CLI (Gemini CLI successor), the Antigravity SDK for building custom agents, parallel agents, and scheduled messages.
Day 5 — Skills, Extensions & Production covers the agentskills.io skill standard, writing custom skills, browser-in-the-loop agents, Firebase integration, and enterprise deployment.
Then you build it for real
The Capstone: Multi-Agent Dev Pipeline builds a development pipeline using Antigravity: a code review agent, a test generation agent, and a documentation agent working in parallel on the same codebase, coordinated through Projects and skills.
Resource links:
- Gemini CLI docs: geminicli.com/docs
- Gemini CLI GitHub: github.com/google-gemini/gemini-cli
- Antigravity: antigravity.google
- Antigravity docs: antigravity.google/docs