Gemini CLI is Google's open-source command-line AI agent that brings Gemini models directly into a developer's terminal. It can inspect project files, answer questions about code, generate and modify source code, run tools, and assist with debugging or development tasks while working within the context of a local repository.

The CLI is intended for interactive coding and automation workflows and can be extended through tools, MCP integrations, configuration, and scripted usage. Because it runs from the terminal, Gemini CLI is useful for developers who prefer agent-assisted development close to their existing shell and source-control workflow rather than working only through a browser-based chat interface.