Structure, organize, and build with your worlds. Powered by OnlyWorlds, an open standard for worldbuilding data.
Works with any AI that reads markdown. Optimized for Claude Code.
Structure — Parse any text into world elements. Paste a paragraph, a chapter, upload files, point at folders. Out comes structured JSON across 22 element types.
Organize — Connect to your world and manage it. Browse elements, clean up descriptions, design complex systems (magic, stories, timelines), export data.
Build — Use OnlyWorlds as a headless backend. REST API, TypeScript SDK, no infrastructure to manage.
/plugin marketplace add OnlyWorlds/toolkit
/plugin install toolkit@onlyworlds
# Restart Claude Code to loadOr direct (no restart needed):
git clone https://github.com/OnlyWorlds/toolkit
claude --plugin-dir ./toolkitPoint at the knowledge files:
| Skill | Purpose |
|---|---|
| onlyworlds-start | Entry point — understands your situation, routes you forward |
| parsing | Text, files, or folders → structured OnlyWorlds elements |
| modeling | Design consultation for complex world systems |
| schema | Field reference across all 22 types |
| api | Fetch, create, update, delete, natural language CRUD |
| survey | Read a world and get a creative brief |
| council | Browse and participate in schema governance |
| link | Find missing connections, enrich links, resolve orphaned elements |
| dev | SDK integration, project scaffolding, deployment |
| project-setup | Connect to an OnlyWorlds world (runs automatically when needed) |
"I want to organize my world"
"Parse this" + text, files, folders
"How should I model a magic system?"
"What fields does Character have?"
"Fetch all my locations"
"Give me a creative brief of my world"
"Are there any schema motions about death_date?"
"Find orphaned elements in my world"
"I'm building a game with world data"
Parsing, modeling, and schema work standalone — no account needed. Output is structured JSON you can use anywhere.
With a free OnlyWorlds account (onlyworlds.com), you get cloud storage, API access, visual tools, and the growing ecosystem of apps and games. The toolkit connects to your world automatically.
MIT