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OnlyWorlds

Official registry Other

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

Website

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http onlyworlds 'https://www.onlyworlds.com/mcp' --header 'API-Key: <World API key (ow_w_ write key, ow_r_ read key, or legacy 10-digit key)>' --header 'API-Pin: <World PIN (required for write keys; read keys skip it)>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "onlyworlds": {
            "type": "http",
            "url": "https://www.onlyworlds.com/mcp",
            "headers": {
                "API-Key": "<World API key (ow_w_ write key, ow_r_ read key, or legacy 10-digit key)>",
                "API-Pin": "<World PIN (required for write keys; read keys skip it)>"
            }
        }
    }
}

Frequently asked questions

What is OnlyWorlds?

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

How do I install OnlyWorlds?

It runs as a remote server. In Claude Code: claude mcp add --transport http onlyworlds 'https://www.onlyworlds.com/mcp' --header 'API-Key: <World API key (ow_w_ write key, ow_r_ read key, or legacy 10-digit key)>' --header 'API-Pin: <World PIN (required for write keys; read keys skip it)>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does OnlyWorlds need an API key?

Yes. It expects API-Key, API-Pin, which you set in its configuration.

Who maintains OnlyWorlds?

It is published by com.onlyworlds. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.