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Summer Engine MCP guide

# How to make games in Grok Build with Summer Engine

Connect Grok Build, the xAI coding agent, to Summer Engine so Grok can create scenes, write gameplay, run the game, and fix errors through MCP. Summer Engine is the desktop game engine; Grok Build is the agent that drives it through MCP.

$ npx -y summer-engine@latest setup grok-build --yes

Grok Build writes the code with your subscription. Summer Engine shows the game.

01

## 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.

02

## Open Grok Build

Use the AI editor you already have. The setup command writes the MCP config and installs the Summer game-dev skills.

03

## 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 Grok Build

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.  
$ npx -y summer-engine@latest install
2. 2  
### Sign in  
Opens your browser once. The CLI and the engine share the session.  
$ npx -y summer-engine@latest login
3. 3  
### Connect Grok Build  
Writes the summer-engine MCP config and installs the Summer game-dev skills.  
$ npx -y summer-engine@latest setup grok-build --yes
4. 4  
### Restart and build  
Restart Grok Build so it reloads config.toml (it also reads \~/.claude.json and .cursor/mcp.json).

Setup notes

## The 2026 specifics.

### Where the config goes

The setup command adds the summer-engine server to \~/.grok/config.toml. Grok Build also reads \~/.claude.json and .cursor/mcp.json, so an existing Claude Code or Cursor setup may already be visible to it.

Why this matters

## Grok Build writes with your subscription. Summer Engine shows the game.

A chat agent alone can write files. With MCP, Grok Build gets tools for the running game engine, so it can inspect the project, run commands, and make changes that become playable inside Summer.

Other setup guides

## Start with Grok Build. Build inside Summer.

Install the desktop app for free, run the setup command, and make your first scene playable.

[Download](https://www.summerengine.com/download)

[Docs ](https://docs.summerengine.com/mcp/overview)

Source: https://www.summerengine.com/mcp/how-to-make-games-in-grok-build

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## Machine-readable resources

- Site index for agents: https://www.summerengine.com/llms.txt
- Full inlined content: https://www.summerengine.com/llms-full.txt
- Porting catalog: https://www.summerengine.com/llms-porting.txt
- Structured catalog: https://www.summerengine.com/agent-catalog.json
- Sitemap: https://www.summerengine.com/sitemap.xml
- Developer resources: https://www.summerengine.com/docs