OnlyWorlds MCP Server: Install & Setup

Install OnlyWorlds in Claude Code

Claude Code

claude mcp add --transport http onlyworlds https://www.onlyworlds.com/mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "onlyworlds": {
      "url": "https://www.onlyworlds.com/mcp"
    }
  }
}

Frequently asked questions

What does the OnlyWorlds MCP server do?

Read and write typed fictional worlds (22 linked element types) via the OnlyWorlds open standard.

Is the OnlyWorlds MCP server free?

The server is free, but you will likely need an account. The server itself is free, but it connects to a service that needs an account or API key, which may have paid tiers. Check the provider for current pricing.

Does OnlyWorlds run locally or remotely?

Remote. Hosted by the provider. You connect with a URL, nothing to install.

How do I add OnlyWorlds to Claude Code?

Run: claude mcp add --transport http onlyworlds https://www.onlyworlds.com/mcp

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