@onlyworlds/mcp-client

OnlyWorlds MCP Client

Model Context Protocol (MCP) client for accessing OnlyWorlds API schema and tools.

Installation

npm install -g @onlyworlds/mcp-client

Or use directly with npx:

npx @onlyworlds/mcp-client

Usage

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "onlyworlds": {
      "command": "npx",
      "args": ["-y", "@onlyworlds/mcp-client"]
    }
  }
}

Environment Variables

• ONLYWORLDS_API_URL - API base URL (optional, defaults to https://www.onlyworlds.com)
• ONLYWORLDS_API_KEY - Your API key (optional, only for world-specific data)
• ONLYWORLDS_API_PIN - Your API PIN (optional, only for world-specific data)

Note: Authentication is not required for accessing the OnlyWorlds schema and tools.

What It Does

This NPM package is a lightweight bridge that connects Claude/Cursor to the OnlyWorlds MCP server. It forwards requests to https://www.onlyworlds.com/mcp/messages/ where the actual MCP implementation runs.

The package enables AI assistants to access:

Resources

• Access complete OnlyWorlds API documentation
• Get schemas for all 22 element types
• View field formatting guides and examples
• Access authentication and endpoint information

Tools (v1.1.0+)

• list_element_types - List all available element types
• get_element_schema - Get complete field list for any element type
• get_field_relationships - Get relationship field mappings
• search_schema_fields - Search for fields across all schemas
• get_field_info - Get detailed information about any field
• get_api_quickstart - Get API documentation with examples
• get_onlyworlds_overview - Get comprehensive OnlyWorlds overview
• get_category_icons - Get icon mappings for categories
• get_element_sections - Get field section organization

Version History

• v1.1.0 - Added full tool support (10 tools for schema exploration)
• v1.0.1 - Bug fixes and improvements
• v1.0.0 - Initial release with resource support

License

MIT