What is the key difference between OnlyWorlds and MCP Registry Server?

OnlyWorlds belongs to the Developer Tools category with cloud HTTP/SSE execution, while MCP Registry Server belongs to the Developer Tools category with cloud HTTP/SSE execution.

How do I install OnlyWorlds or MCP Registry Server in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are OnlyWorlds and MCP Registry Server free or paid?

OnlyWorlds operates under a Free / Open Source model (No auth required). MCP Registry Server operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

OnlyWorlds lists 0 tools with 0 views and 0 GitHub stars. MCP Registry Server lists 0 tools with 0 views and 7,133 GitHub stars.

Can I use both OnlyWorlds and MCP Registry Server together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

How do I install OnlyWorlds or MCP Registry Server in Claude Desktop, Cursor, or Windsurf?

Both servers follow the standard Model Context Protocol configuration format. Simply copy the JSON block from the configuration section above and paste it into your AI client's mcpServers configuration object (for instance in claude_desktop_config.json or ~/.cursor/mcp.json ), then completely restart or refresh the application.

Are OnlyWorlds and MCP Registry Server free to use, or do they require API keys?

OnlyWorlds is listed under a Free / Open Source model with No auth required . MCP Registry Server operates under a Free / Open Source model with No auth required . If environment variables are required (such as API keys), be sure to define them under the env key in your MCP client's configuration file.

Can I run both OnlyWorlds and MCP Registry Server at the same time in my AI client?

Yes! MCP clients support multi-server orchestration. You can include both onlyworlds and mcp-registry-server as distinct keys inside the single mcpServers object in your configuration file. Your AI assistant will automatically select and call the appropriate tool from either server during chat sessions.

Which MCP server has higher directory engagement and quality ratings?

On AllMCPs, OnlyWorlds has a Quality Score of 42 /100 ( Fair ) with 0 views, 0 installs, and 0 GitHub stars. MCP Registry Server holds a Quality Score of 48 /100 ( Fair ) with 0 views, 0 installs, and 7,133 GitHub stars.

Side-by-Side Model Context Protocol Comparison

OnlyWorlds vs MCP Registry Server

In-depth architectural comparison of the OnlyWorlds and MCP Registry Server MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

OnlyWorlds

Developer Tools · Remote HTTP/SSE

Quality: 42/100 (Fair) | Auth: No auth required

MCP Registry Server

Developer Tools · Remote HTTP/SSE

Quality: 48/100 (Fair) | Auth: No auth required

Verdict Summary: Choose OnlyWorlds if you need specialized Developer Tools tools running via a hosted cloud SSE transport. Choose MCP Registry Server if your workspace requires Developer Tools integration with remote web transport. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose OnlyWorlds when:

You need dedicated capabilities in the Developer Tools domain.
You prefer remote streaming HTTP/SSE transport architecture.
Your security boundary fits: No auth required (Free / Open Source).

Explore OnlyWorlds Details

Choose MCP Registry Server when:

You need dedicated capabilities in the Developer Tools domain.
You prefer remote streaming HTTP/SSE transport architecture.
Your security boundary fits: No auth required (Free / Open Source).

Explore MCP Registry Server Details

Feature & Specification Comparison

Specification	O OnlyWorlds Developer Tools	M MCP Registry Server Developer Tools
Summary	Read and write typed fictional worlds (22 linked element types) via the OnlyWorlds open standard.	Publish and discover MCP servers via the official MCP Registry. Powered by HAPI MCP server.
Category & Scope	Developer Tools	Developer Tools
Quality signal

Tools & Capabilities Breakdown

OnlyWorlds Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

MCP Registry Server Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

OnlyWorlds Configuration

mcpServers (Claude Desktop / Cursor)

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

MCP Registry Server Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "mcp-registry-server": {
      "url": "https://registry.modelcontextprotocol.io/docs"
    }
  }
}

Frequently Asked Questions

OnlyWorlds is categorized under Developer Tools and uses a remote streaming HTTP/SSE transport. In contrast, MCP Registry Server belongs to Developer Tools using remote streaming HTTP/SSE transport. Select OnlyWorlds when you need capabilities focused on developer tools and MCP Registry Server when you require tools for developer tools.

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