What is Summer Engine?

Summer Engine is a real desktop game engine for agent-led game development: an editor, scene tree, runtime, assets, exports, and local diagnostics. You build and run a Summer game inside the engine instead of stopping at files generated in a chat window.

MCP gives your AI agent a controlled bridge into the running engine. Through 44 tools, it can create scenes, add nodes, set properties, run the game, inspect errors, and import or generate assets instead of only editing files blindly.

What does the CLI do?

The summer-engine CLI downloads the desktop app, signs you in, writes the MCP config for Claude Code, Cursor, Codex CLI, Devin Desktop, Gemini CLI, LM Studio, Kilo Code, and other agents, installs the game-dev skills, creates projects, runs them, and checks that everything is connected.

Can I use a free local model instead of a subscription?

Yes. Run a model on your own GPU with Ollama or LM Studio and connect it through the same MCP server. Engine control and asset search stay free; cloud generation uses credits. See the Ollama, LM Studio, and Goose guides for the setups that actually work in 2026.

Can games made with Summer be exported?

Summer projects can be run and tested locally. Export availability depends on the installed target templates and toolchains; signing, store review, and submission remain creator-controlled.

Is Summer Engine free?

Yes. Summer Engine is free to download and start using. The CLI, MCP server, skills, hooks, and plugin manifests are MIT open source. Heavy hosted AI and cloud generation features use credits. See /source-status for the exact open, free, and paid split.

Summer Engine MCP

Crea juegos realesen Claude Code.

Conecta un agente de IA o modelo local compatible a Summer Engine. Usa el plan de IA que ya tienes para crear, ejecutar y probar un juego Summer localmente; la exportación depende de las plantillas y toolchains del destino.

or run the CLI directly

MCP gratisTu plan de IA o un modelo localCrea juegos Summer jugables

Descargar app de escritorio Leer docs de MCP

Agent guides

Cómo crear juegos en Claude Code, Cursor y más

Claude Code Cursor Codex CLI Devin Desktop Gemini CLI CCline

What it is

Un engine de escritorio que tu agente puede operar de verdad.

Summer Engine es gratis para usar con MCP.

Conecta un agente de IA o modelo local compatible.

Usa tu suscripción de IA actual para crear juegos Summer dentro de Summer Engine.

Ejecuta y prueba juegos Summer localmente; las exportaciones requieren las plantillas y toolchains del destino.

Cómo funciona

1. Download the engine

Install the Summer Engine desktop app. This is where the scene tree, runtime, assets, and exports live.

2. Set up MCP

Run the CLI setup command. It writes the agent config, installs skills, and connects to the local engine API.

3. Build with your agent

Claude Code, Cursor, and other MCP clients get 44 engine tools for real game development.

Jugable, no imaginado

Tu suscripción de IA escribe. Summer muestra el juego.

Por qué se siente distinto

Tu agente deja de adivinar y empieza a usar el engine.

Claude Code, Cursor y Devin Desktop ya escriben código. Summer le da a ese código un engine de juego real: abrir la escena, colocar objetos, ejecutar el proyecto, inspeccionar errores y repetir hasta que el loop sea jugable.

Agent guides