Gemini CLI

Gemini CLI extensions

Extensions package prompts, MCP servers, custom commands, themes, hooks, subagents and agent skills, and install from a GitHub URL or local path.

promptsMCP serversslash commandsthemeshookssubagentsskillscontext files

At a glance

Manifest file: gemini-extension.json
Install: gemini extensions install <source>
Official directory: Gemini CLI extension gallery
Your own marketplace: Not documented

Links

Official documentation How to build one Browse Gemini CLI extension gallery Gemini CLI: standards support, subagents and hooks

Gemini CLI setup guides

How do I stop Gemini CLI asking before every tool call?How do I disable Gemini CLI telemetry?Where does Gemini CLI read settings.json from, and how do I add MCP servers and context files like AGENTS.md?How do I install, build, and manage Gemini CLI extensions and custom slash commands?

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Reviewed Oct 9, 2026.