jgengine

Agent-side CLI for the JGengine TypeScript game SDK (@jgengine/* on npm). Not automotive.

Docs: jgengine.com · Source: Noisemaker111/jgengine

Human interface

People don't run this CLI — they tell a coding agent:

Make a game that … with jgengine

Agent quickstart

npx jgengine create "Game Name"   # scaffold a playable base + install agent skills into the project
cd Game-Name
# follow the installed `jgengine` skill: intake → foundation + only the domains the game needs → build

The game is its own project on the published npm packages. Never clone the jgengine GitHub repo to build a game, and never copy code, assets, or content from its Games/* directory — those are private in-repo test games, not templates.

Skills ship inside this package under skills/ and are installed into the project by create (recovery: npx jgengine skills -p). They cover intake/routing, world, gameplay, combat, UI, multiplayer, editor authoring, assets, verification, and game/level design.

Commands

| Command | What it does | | --- | --- | | create "<Game Name>" | Scaffold playable base + install skills (--from-scene <folder>, --standalone/--in-repo, --no-install, --no-skills, --pm bun\|npm\|pnpm) | | editor [dir] | Open the standalone 3D scene editor on a folder; Ctrl+S writes editor.scene.json back | | desktop [dir] | Ship a Windows NSIS installer for a project or --url | | skills -p \| -g | Re-install agent skills (project / global) | | doctor [dir] | Diagnose version skew, missing peers, unstyled HUD, shape drift | | assets … | List, search, and pull CC0 asset packs (@jgengine/assets) | | editor-mcp … | Scene-editor agent bridge (document RPC / localhost server) | | versions | CLI + installed @jgengine/* versions |

Packages

The lockstep SDK set is @jgengine/{core,react,ws,node,sql,convex,shell,editor,assets} — versions move together; see CHANGELOG.md (also importable as typed data from @jgengine/core/meta/changelog).