OnlyWorlds is a Model Context Protocol (MCP) server: Read and write typed fictional worlds (22 linked element types) via the OnlyWorlds open standard. Because it speaks the Model Context Protocol, AI assistants can use OnlyWorlds as a set of callable tools instead of you copy-pasting between apps.
It's a hosted (remote) server — point your client at https://www.onlyworlds.com/mcp and you're connected, with nothing to install locally. The current release is v1.0.0.
On mcp.site, OnlyWorlds sits in the Development category. Any MCP client can use it — Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, Zed among them — via the install snippets below. If you maintain OnlyWorlds for onlyworlds.com, claim this listing to verify ownership, earn the Verified badge, and keep the details current.