Make games inClaude Code

Summer is the game engine built for AI. Connect the agent you already use, free. It builds, tests and publishes full multiplayer games, and makes the art, sound and video for them.

Paste this into your coding agent. It installs Summer Engine, signs you in and connects itself.

Set up Summer Engine for me so I can build games and make game content from here.
First, check that `node --version` prints 20 or newer. On Windows, if Node is missing, ask me, then install it with `winget install -e --id OpenJS.NodeJS.LTS` and remind me to restart you once setup is done. In Windows PowerShell, type `npx.cmd` wherever a command says `npx`.
1. Install the engine app: run `npx -y summer-engine@latest install` (about 1 GB; skip it if Summer Engine is already installed, or if I only want assets and video for a game built in another engine).
2. Sign in: run `npx -y summer-engine@latest login` and let me finish the sign-in in the browser it opens.
3. Connect this agent: run `npx -y summer-engine@latest setup <agent> --yes` with your own installer id (for example claude-code, codex, cursor), then tell me if I need to restart or reload you.
If setup also adds Summer Games (summer-games), tell me the one-time sign-in step it prints.
Let me know when it is ready.

How to connect

Connect Summer to Claude Code

  1. 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. 2

    Sign in

    Opens your browser once. The CLI and the engine share the session.

  3. 3

    Connect Claude Code

    Writes the summer-engine MCP config and installs the Summer game-dev skills.

  4. 4

    Restart and build

    Restart Claude Code or run /mcp in a new session.

Full Claude Code guide
Download desktop appor run the CLI directly

Connect by URL

No install. Add the Summer address to your AI app and sign in to Summer once in the browser. Your agent can then make game assets, game plans and store pages, publish to Summer Games, see how your games do and change prices. Agent permissions in Studio settings say what it may do without asking; for now it still asks you first before it publishes or changes prices, A/B tests or member roles, and in Studio for anything else. To build and run games in the engine on your computer, use the setup above.

Summer address

  • Claude Code

    Run this in your terminal, then type /mcp in Claude Code and sign in.

  • Codex

    Run these in your terminal. The second one opens your browser to sign in.

  • Cursor

    Add this to ~/.cursor/mcp.json, then sign in when Cursor asks.

  • VS Code

    Add this to .vscode/mcp.json in your project, then sign in when VS Code asks.

  • Claude

    In Claude, open Customize, then Connectors, then Add custom connector, and paste the address.

  • ChatGPT

    In ChatGPT, open Settings, then Apps, then Advanced settings, and turn on Developer mode. Then press Create app and paste the address.

Play with friends from your AI app

This page sets up Summer Engine, for making games. To play, connect your Summer Games account to Claude, ChatGPT or another AI app instead. Ask it who is online, message your friends and invite them to a game.

Add Summer as a custom connector with this address.

How to connect your Summer Games account