jgengine

jgengine is an open-source TypeScript game engine SDK distributed on npm under @jgengine/core, designed for coding agents to build games from a single descriptive prompt. It provides capabilities for generating game content such as cities, wind fields, and terrain, along with a command-line tool and an online playground. The engine runs directly in the browser using three.js for drawing and Rune for UI, and its source code is published on GitHub at Noisemaker111/jgengine under an Apache-2.0 license.

The engine is built specifically for coding agents like Claude Code, Codex, or Cursor, allowing them to find parts, use them, and prove they work. It operates as a framework of game parts on three.js rather than a general-purpose 3D engine or ECS. Agents interact with the API from node_modules, and the CLI answers questions about where components live, whether features exist, and what the game looks like when run.

Users can get started by running the command 'npx jgengine create "My Game"' to generate a playable base with skills installed. The CLI also supports 'jgengine find <words>' to locate where a concept already lives and 'jgengine has <feature>' to check if the engine does something yet. Additionally, 'jgengine recipe <name>' creates a wired, type-checked snippet, and 'jgengine shoot' drives a screenshot or allows playing with keys.

Ten real games are built and tested against the engine, including Beacon Bastion, Brightway Park, Deepward, Drift Foundry, Ember Command, Fernwild, Harbor Heat, Odd Orbit, and Scrap Signal. These games live in the repository's games/ folder and run from the same engine commit, ensuring that engine changes that break a game are fixed in the same pull request. Beacon Bastion is a tower defense game, while Brightway Park is a park-builder tycoon.

The engine's philosophy is that a boss fight, supply drop, or breeding system is not a closed engine feature but a combination of small parts. This modular approach allows developers to assemble systems flexibly without being locked into pre-packaged features. Every part can be independently modified or replaced to suit the specific needs of the game being built.

The engine's website explicitly states it is not related to automotive 'JG Engines', distinguishing its identity in the market. It is a pure-TypeScript game engine SDK with a command-line tool distributed on npm. The project maintains a website at jgengine.com and an online playground for interactive demos.

The engine is built to be extended by coding agents, with skills shipping inside npm packages so agents read the API from node_modules. The CLI answers questions about component locations and engine capabilities, providing a direct interface for agents to interact with the system. This design ensures that the agent has full visibility into the engine's structure and functionality.

The engine is built for agents, not around them, with skills installed via npm packages. The CLI provides commands like 'jgengine create', 'jgengine find', 'jgengine has', and 'jgengine recipe' to help agents build and verify games. The system is designed to be intuitive for agents to read and use directly.

The official website of jgengine is jgengine.com.

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