Use Summer Engine
from any AI agent.
Open-source MCP server, 37 engine tools, and 20 game-dev skills. One install, every coding agent. Free.
Or paste this into your agent: "Install Summer Engine and let's make a game."
Works with every coding agent
What you get
One package, three layers.
Engine tools
Direct MCP bridge to a running Summer Engine. Create scenes, add nodes, set properties, run the game, read errors, generate assets, inspect resources.
Game-dev skills
Short markdown discipline guides. They auto-fire on intent so the agent reads production patterns before writing code, not after.
CLI
summer install · login · run · create · doctor · skills · mcp. Bootstraps your harness, handles auth, and runs the engine headlessly when an agent needs it.
Skill library
20 disciplines, one prompt away.
Skills load on intent. Ask for a double-jump and the agent reads character-controllers. Ask for a lobby and it reads multiplayer-and-networking.
Sprite import, atlases, pixel-art rules
Mesh import, LODs, scale and pivot
Behavior trees, dialogue, memory
AnimationPlayer, blends, state graphs
Import presets, material binding
Buses, 3D sound, ducking, music transitions
Movement, jump, slopes, ladders
Read errors, fix scripts, validate scenes
Export presets, Steam, mobile, web
Inventories, abilities, save systems
InputMap, rebinding, gamepads
Tilemaps, terrain, blockouts
Authority, sync, lobbies, lag tolerance
Profiling, draw calls, occlusion
Bodies, joints, raycasts, layers
Glow, SSAO, color grade, vignette
Light bakes, probes, environments
Scene composition, project settings
Signals, autoloads, state machines
Spatial, canvas, godot shading language
How it works
Agent ↔ MCP ↔ Engine.
Your agent
Claude Code, Cursor, Codex, or any agent that speaks MCP. You write prompts, the agent picks tools and skills.
MCP server
Local Node process. Ships 37 tools the agent can call. Speaks to the engine over localhost:6550.
Summer Engine
AI-native game engine compatible with Godot 4. Receives ops, runs scenes, returns diagnostics. You see results live.
Frequently asked
Common questions
- What is the Summer Engine MCP?
- An open-source MCP (Model Context Protocol) server plus a library of game-dev skills that lets AI coding agents work inside a running Summer Engine instance. Install it once and every agent you use, Claude Code, Cursor, Codex, Gemini, gets the same toolset for building games.
- Do I need Summer Engine installed?
- Yes. Download Summer Engine first at https://www.summerengine.com/download. The CLI then bootstraps the MCP server and connects your agent to the running engine on localhost:6550.
- Is it really free?
- The plugin (MCP server + skills + CLI) is MIT licensed. The Summer Engine desktop app is free to download. Heavy cloud asset generation (3D models, animation, audio) is usage-based, with a free monthly credit pool.
- Which agents does it support?
- Claude Code, Cursor, Codex CLI, Gemini CLI, Windsurf, Cline, Roo, Copilot CLI, Factory Droid, and OpenCode. Any agent that speaks MCP works.
- What can the skills do?
- Skills are short markdown playbooks that auto-fire on intent. They cover 20 game-dev disciplines, from character controllers and multiplayer to shaders, post-processing, and Steam deployment. Each one is a discipline guide an agent reads before writing code, so you get production patterns instead of one-shot snippets.
- Can I contribute a skill?
- Yes. The repo lives at https://github.com/SummerEngine/summer. Run `summer skills create` in the CLI and it scaffolds a new skill folder you can PR.
Open the editor your agent already lives in.
Free, MIT licensed, and ready in a single command. Star the repo if you want updates, or paste the install line into your agent and start building.
Read the docs on github.com/SummerEngine/summer.