Summer Engine MCP guide
How to make games in Gemini CLI with Summer Engine
Use Gemini CLI with Summer Engine MCP to create, run, inspect, and improve games in a real desktop engine. Summer Engine is the desktop game engine; Gemini CLI is the agent that drives it through MCP.
Summer is free for MCP use
Download the desktop engine and connect it to your agent. You are not paying Summer for the AI calls your existing subscription already covers.
Open Gemini CLI
Use the AI editor you already have. The setup command writes the MCP config and installs the Summer game-dev skills.
Launch a real game
The agent writes code. Summer Engine shows the game, runs Play mode, and exports projects for Steam, desktop, mobile, and console pipelines.
Why this matters
Gemini CLI writes with your subscription. Summer Engine shows the game.
A chat agent alone can write files. With MCP, Gemini CLI gets tools for the running game engine, so it can inspect the project, run commands, and make changes that become playable inside Summer.