Gemini CLI

Name: Gemini CLI
Author: AgentRadar

Verified

Google's open-source terminal agent with ReAct reasoning and Google Cloud integration

Coding Agents Freemium

8.4 /10

Visit Website GitHub

Released

2025-04

Country

United States

API

Available

Self-Host

Yes

GitHub Stars

105,000

Funding

Public (Alphabet)

Last Updated

2026-06

About Gemini CLI

Gemini CLI is Google's entry into the terminal coding agent space — an open-source, Apache 2.0 CLI that leverages a ReAct (Reason-Act) loop to break down complex tasks into reasoning steps and actions. Unlike simple chat-in-terminal tools, it iterates autonomously: it reasons about a problem, takes an action (reading files, running grep, executing terminal commands), observes the result, and continues until the task is complete. Built-in tools for file read/write, grep, terminal access, and web search and fetch give it broad capability without external plugins. It also supports the Model Context Protocol for extending its toolset and includes Agent Skills for reusable task patterns. Deep Google Cloud integration means it can interact with GCP services, and it ships pre-installed in Google Cloud Shell. A headless mode enables scripting and CI/CD integration. Backed by Gemini 3 models and 105K+ GitHub stars, it is one of the fastest-growing coding agents in 2025.

Verdict

Google's strongest play in the terminal coding agent space — the ReAct reasoning loop delivers genuine multi-step autonomy, and built-in web search plus Google Cloud integration make it uniquely suited for developers in the Google ecosystem. The free Code Assist tier is generous, and 105K+ stars speak to rapid adoption. Less model-flexible than BYOK agents, but unmatched for teams standardizing on Gemini and GCP.

Features

ReAct (Reason-Act) loop for multi-step task execution

Built-in tools: grep, terminal, file read/write

Web search and fetch for real-time information

Model Context Protocol (MCP) support

Agent Skills for reusable task patterns

Headless mode for scripting and CI/CD

Gemini Code Assist IDE integration

Google Cloud Shell pre-installed

Detailed Ratings

Ease of Use

8.0

Value for Money

8.0

Features

9.0

Support

9.0

Performance

8.0

Overall Rating

8.4 /10

Pros & Cons

Pros

ReAct loop delivers genuine multi-step reasoning and autonomous execution
Free tier with Gemini Code Assist quota — accessible without an API key
Built-in web search lets the agent fetch live documentation and answers
105K+ GitHub stars and Google Cloud Shell pre-installed — massive reach
Google-backed support and enterprise-grade reliability

Cons

Requires Google authentication — barrier for users outside the Google ecosystem
Free tier has quota limits; heavy usage needs pay-as-you-go API key
Optimized for Gemini models — no first-class Claude or GPT routing

Use Cases

Terminal coding with Google Cloud integration and GCP service interactionMulti-step tasks that benefit from ReAct reasoning loopsCI/CD automation via headless modeDevelopment in Google Cloud Shell with pre-installed agentTasks requiring real-time web search and documentation lookup

Who Is It For?

Developers in the Google ecosystem who want a terminal agent with ReAct reasoning, web search, and Google Cloud integration

#cli#terminal#open-source#google#react#mcp

Pricing Plans

Free

Gemini CLI with Code Assist quota
Google authentication required
Monthly free usage limits

Pay-as-you-go

Per token /month

Google AI API key billing
No fixed quota limits
Access to all Gemini models

Frequently Asked Questions

Is Gemini CLI free to use?

Yes — there is a free tier through Gemini Code Assist with a monthly quota. For heavier usage, you can switch to a pay-as-you-go model with a Google AI API key, which bills per token.

What is the ReAct loop?

ReAct (Reason-Act) is a reasoning pattern where the agent alternates between thinking about what to do next and taking an action — reading a file, running a command, searching the web. This iterative loop continues until the task is complete, making it genuinely agentic rather than a single-shot response.

How is Gemini CLI different from Claude Code?

Gemini CLI uses Google's Gemini models and a ReAct reasoning loop, with built-in web search and Google Cloud integration. Claude Code uses Anthropic's Claude models with a 1M-token context window and terminal-first execution. Both are terminal agents, but Gemini CLI's strength is Google ecosystem integration while Claude Code's is deep codebase context.

Can I use Gemini CLI without a Google account?

No — Gemini CLI requires Google authentication. You can sign in with a Google account to use the free Code Assist quota, or use a Google AI API key for pay-as-you-go access.