Google's open terminal agent, with a large context window and Search built in. Built by Google.
Others in coding agent
Aider
Claude CodeThe terminal agent, taught properly: the loop, the permissions, the files that make it behave.
Cline
Codex CLIThe coding agent, taught from the boundary in: what it may touch, and how you widen it.Common questions
Is Gemini CLI free to use?
Gemini CLI is open source and free to run yourself. You still pay whichever model provider you point it at, and this tutorial is free with no signup.
Do I need to know Python to use Gemini CLI?
Basic Python is enough. Functions, dictionaries and imports cover most of what Gemini CLI asks of you.
When should I not use Gemini CLI?
When something else in coding agent fits the job better. The others in that group are listed below.
Lessons for Gemini CLI are being written. Meanwhile the APIs for AI tutorial covers the same ground: state, tools, loops, memory and human approval. Most of it carries straight over.
Start the APIs for AI tutorial →