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

制作真实游戏就在 Claude Code。

把受支持的 AI agent 或本地模型连接到 Summer Engine。继续使用你已有的 AI 方案，在本地制作、运行和测试 Summer 游戏；导出仍需要目标平台的模板和工具链。

or run the CLI directly

免费使用 MCP现有 AI 方案或本地模型制作可玩的 Summer 游戏

下载桌面应用阅读 MCP 文档

Agent guides

如何在 Claude Code、Cursor 等工具中制作游戏

Claude Code Cursor Codex CLI Devin Desktop Gemini CLI CCline

What it is

一个你的 agent 真正能操作的桌面引擎。

Summer Engine 可免费用于 MCP。

连接受支持的 AI agent 或本地模型。

用你现有的 AI 订阅在 Summer Engine 里创建 Summer 游戏。

在本地运行和测试 Summer 游戏；导出需要目标平台的模板和工具链。

如何工作

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.

可玩，不是假装

你的 AI 订阅负责写。Summer 展示游戏。

为什么感觉不一样

你的 agent 不再猜测，而是开始使用引擎。

Claude Code、Cursor 和 Devin Desktop 已经会写代码。Summer 给这些代码一个真正的游戏引擎：打开场景、放置物体、运行项目、检查错误，然后重复，直到游戏循环可以玩。

Agent guides