Google Gemini CLI: Know All About Open-Source AI Agent

On June 25, 2025, Google launched Gemini CLI, a free and open-source AI agent that runs directly in developers’ terminals. Powered by the advanced Gemini 2.5 Pro model, it offers a massive 1 million-token context window. 

The tool works on Windows, Mac, and Linux and connects through a free Gemini Code Assist licence tied to a personal Google account. Users get generous usage limits—60 model requests per minute and up to 1,000 per day.

Gemini CLI lets developers write and debug code, generate content, manage tasks, and conduct deep research—all using natural language in the terminal. 

It also supports multimedia creation with Imagen and Veo and integrates with Google Search and the Model Context Protocol. Google open-sourced the project under Apache 2.0 to invite community contributions.

In this article, we’ll guide you through what Gemini CLI offers, how to install and use it, and why it matters for developers.

What Is Google Gemini CLI and How Does It Work?

Google Gemini CLI is a free tool that lets you use AI in your computer’s terminal (the black screen developers use to type commands).

CLI stands for “Command Line Interface”. It’s powered by Google’s Gemini 2.5 Pro model—an advanced AI that understands natural language and code.

You can talk to this AI in plain English. Just type your question or command, and Gemini replies right in the terminal. It can help you write code, explain errors, research topics, or even create text and images. It runs on Windows, Mac, and Linux. All you need is a Google account to use it for free.

How Does It Work?

• Once installed, you can type questions or instructions just like chatting with AI.
• Gemini CLI responds by:
• Writing code
  • Solving problems
  • Creating content
  • Helping with research
• It runs fully inside your terminal; no extra app is needed.
• It uses Google Search to bring in real-time information when needed.
• Gemini CLI connects with Gemini Code Assist, Google’s AI coding tool.
• You get AI help in both:
  • Your terminal (CLI)
  • VS Code (via chat agent)
• It is fully open-source under the Apache 2.0 licence.
• Developers can inspect the code, customise it, or add new features.
• Free to use with a personal Google account.
• Offers huge free limits:
  • 60 model requests per minute
  • 1,000 model requests per day

Key Features of Google Gemini CLI for Developers

Gemini CLI is built for developers but is easy enough for beginners to try. Here are some main features:

• Code Help: It writes code for you or fixes mistakes.
• Content Generation: It can create text, summaries, or blog content.
• Smart Research: Ask questions and get quick answers, just like Google Search.
• Media Tools: Generate images or videos using Imagen and Veo (AI tools).
• Context Memory: It understands long prompts (up to 1 million tokens).
• Fast and Free: You get 60 uses per minute and 1,000 per day—at no cost.

How to Install and Use Gemini CLI on Your System

Getting started with Gemini CLI is simple:

• Go to the official Gemini CLI website.
• Download the version for your system (Windows, Mac, or Linux).
• Install it by following the step-by-step guide on the page.
• Open your terminal and type gcli to launch Gemini CLI.
• Sign in using your Google account.
• Now, type a question or ask to write some code. For example, try: gcli how to write a Python function to check if a number is even?

The AI will respond instantly. You can keep chatting with it like a smart assistant that understands coding, writing, and research tasks.

How Can I Use Gemini CLI for My Daily Tasks?

You might be wondering: How can this tool help me in real work? Here are a few ways Gemini CLI can make your life easier:

• Need help with code? Just type a question like:
• GCLI, how do I fix this Python error?
• Gemini will explain the error or even suggest code fixes.
• Want to automate tasks? You can use Gemini CLI in scripts. For example, automate file cleanups, data conversions, or content generation.
• Doing research? Use commands that pull live info with Google Search. Just say:
• GCLI summarises the latest news on electric cars
• It fetches data and gives you a short answer.
• Creating content or media? Ask Gemini to write blog posts, generate images, or even create short videos using Imagen and Veo tools.

Gemini CLI is flexible. Whether you’re coding, writing, learning, or automating, just type what you need, and the AI helps you get it done.