> ## Documentation Index > Fetch the complete documentation index at: https://summer-18f03259-codex-native-multiplayer-entry.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # What is Summer Engine? > Summer Engine is the AI game engine where you build a Summer game in GDScript with AI that understands your whole project. ## What is Summer Engine? Summer Engine is **the AI game engine**. It's not just a game engine with a plugin bolted on. It's a professional engine built from the ground up for AI, where the AI understands your entire project and can modify scenes, code, and assets through natural language commands. You make a **Summer game** in **GDScript**. When you need multiplayer, player identity, persistence, economy, or submission surfaces, you integrate the **Summer SDK**. Summer is the product creators install and use; upstream lineage belongs in the [compatibility reference](/reference/compatibility), not in the product name. **Think of it as Cursor for game development.** Instead of juggling ChatGPT, VS Code, and another engine, you work in one unified environment. You describe what you want; Summer Engine writes the code, creates assets, and modifies your game directly. ## How Summer Engine Differs from Other Approaches **Unified experience.** No switching between tools. The AI understands your project context because it indexes your codebase, scenes, and assets. When you ask "add a health bar to my player," it knows which player script and scene to modify. **Safe operations.** AI changes go through engine APIs with full undo support. Nothing breaks unexpectedly. Every change can be reverted with Ctrl+Z. **Project intelligence.** Summer Engine automatically indexes your project when you open it: scripts, scenes, assets, and their relationships. The AI uses this to give context-aware help, not generic advice. **Specialist agents.** For complex tasks (3D modeling, audio design, physics), Summer Engine can bring in domain experts that run in parallel and stay focused on their area. ## Who Is Summer Engine For? Summer Engine is for everyone who wants to make games. Beginners can build complete games by describing them in plain English. Professionals get a production-ready tool that accelerates workflow. We shipped a commercial Steam game in 2.5 months using Summer Engine. You get full access to the underlying engine and complete control over your architecture. ## Related Build a game with just AI, no coding Learn how to use Summer Engine's AI