Summer Engine MCP guide
How to make games in Claude Code with Summer Engine
Use Claude Code as the agent and Summer Engine as the real game engine for playable projects, local debugging, and exportable builds. Summer Engine is the desktop game engine; Claude Code 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 Claude Code
Use the AI editor you already have. The setup command writes the MCP config and installs the Summer game-dev skills.
Run a Summer game
The agent writes code. Summer Engine shows the Summer game, runs Play mode, and helps inspect errors. Export still requires the target templates and toolchains.
Install
Connect Summer to Claude Code
- 1
Install Summer Engine
Downloads the desktop engine app, about 1 GB. Skip it if Summer Engine is already installed, or if you only need assets and video for a game built in another engine.
- 2
Sign in
Opens your browser once. The CLI and the engine share the session.
- 3
Connect Claude Code
Writes the summer-engine MCP config and installs the Summer game-dev skills.
- 4
Restart and build
Restart Claude Code or run /mcp in a new session.
Setup notes
The 2026 specifics.
Summer Games comes too
Setup also adds summer-games, so Claude Code can see your Summer Games friends, message them and invite them to a party, as you. Sign in once: run /mcp in Claude Code, choose summer-games and sign in on summer.games.
Why this matters
Claude Code writes with your subscription. Summer Engine shows the game.
A chat agent alone can write files. With MCP, Claude Code gets tools for the running game engine, so it can inspect the project, run commands, and make changes that become playable inside Summer.