21st.dev Magic + OpenSumi: Complete MCP Integration

21st.dev Magic is a MCP server that Create crafted UI components inspired by the best 21st.dev design engineers..

When integrated with OpenSumi, you can:

• Generate crafted UI components using AI design patterns
• Live preview of generated components
• Full TypeScript support for generated components

This guide provides step-by-step instructions to set up 21st.dev Magic in OpenSumi, including configuration, examples, and troubleshooting.

What You'll Achieve

After completing this setup:

• 21st.dev Magic will be fully integrated and operational
• You can use 21st.dev Magic tools directly in OpenSumi
• All 21st.dev Magic capabilities will be available for your workflows
• Access to 4 different tools

Prerequisites

Before starting, ensure you have:

• 21st.dev account
• API key
• 21st.dev Magic API key for authentication
• OpenSumi installed and configured
• Compatible operating system (Web (Browser-based), Electron Desktop, Container (Docker/K8s), Framework Integration)

Installation

Step 1: Install 21st.dev Magic

Manual installation steps:

1. Generate API key from 21st.dev Magic Console
2. Add configuration to IDE-specific JSON config
3. Restart IDE to load MCP server

Configuration

Step 2: Configure OpenSumi

1. Open OpenSumi settings
2. Navigate to MCP server configuration
3. Add 21st.dev Magic server with appropriate settings
4. Save and restart if needed

Examples

Once configured, you can use 21st.dev Magic in OpenSumi:

Create Navigation Bar

Generate a modern responsive navigation component

Ask OpenSumi: "/ui create a modern navigation bar with responsive design"

Expected Result: Responsive navigation component with mobile menu, logo placement, and styling

Generate Dashboard Card

Create a dashboard card with metrics display

Ask OpenSumi: "/ui design a dashboard card showing user analytics with charts"

Expected Result: Card component with chart integration, metrics display, and responsive layout

Build Form Component

Create a contact form with validation

Ask OpenSumi: "/ui create a contact form with validation and modern styling"

Expected Result: Form component with input validation, error states, and submit handling

Design Landing Hero

Generate a landing page hero section

Ask OpenSumi: "/ui build a hero section for a SaaS product with CTA buttons"

Expected Result: Hero component with headline, description, call-to-action buttons, and background

Testing Your Setup

1. Launch OpenSumi
2. Verify 21st.dev Magic is available in the tools list
3. Test basic 21st.dev Magic functionality

Troubleshooting

Common Issues

API Key Invalid

Symptoms: Authentication errors, Access denied messages, Server connection failures

Cause: Invalid or expired API key

Solution:

• Generate new API key from 21st.dev Magic Console
• Update API_KEY in IDE configuration
• Restart IDE to reload configuration

IDE Not Detecting MCP Server

Symptoms: MCP commands not available, Server not listed in IDE

Cause: Incorrect configuration file or location

Solution:

• Verify config file is in correct location for your IDE
• Check JSON syntax in configuration file
• Restart IDE after configuration changes
• Use CLI installation for automatic setup

Component Generation Fails

Symptoms: Empty responses, Error messages during generation

Cause: Network issues or service limitations

Solution:

• Check internet connectivity
• Verify API key has sufficient quota
• Try simpler prompts initially
• Contact support if issues persist

TypeScript Errors in Generated Code

Symptoms: Type errors, Compilation failures

Cause: Missing dependencies or type definitions

Solution:

• Install required TypeScript dependencies
• Update @types packages
• Configure TypeScript strict mode properly
• Import necessary type definitions

Dependency Installation Failures

Symptoms: Yarn/npm install errors, Missing packages, Version conflicts

Cause: Incompatible Node.js version or network issues

Solution:

• Ensure Node.js 16+ is installed
• Use yarn for standard installation, npm for lite version
• Clear package cache: yarn cache clean or npm cache clean --force
• Check network connectivity and proxy settings

Workspace Not Loading

Symptoms: Empty workspace, Files not showing, Permission errors

Cause: Incorrect workspace path or permissions

Solution:

• Verify MY_WORKSPACE environment variable is set correctly
• Check file system permissions for workspace directory
• Use absolute path for workspace location
• Default workspace is tools/workspace in repository

VSCode Extension Compatibility

Symptoms: Extension not loading, Extension errors, Missing features

Cause: Extension API incompatibility or missing dependencies

Solution:

• Verify extension is compatible with VSCode extension API used by OpenSumi
• Check extension documentation for known issues
• Try downloading extensions via yarn run download-extension
• Some extensions may require OpenSumi-specific adaptation

WebWorker Compilation Errors (Lite Version)

Symptoms: Compile-worker fails, Language service not working, Syntax highlighting broken

Cause: WebWorker build configuration issues

Solution:

• Run npm run compile-worker before starting
• Ensure all dependencies are installed correctly
• Check browser console for WebWorker loading errors
• Clear browser cache and rebuild

MCP Client Connection Failures

Symptoms: Cannot connect to MCP server, Tool discovery fails, MCP errors in console

Cause: MCP server not running or incorrect configuration

Solution:

• Verify MCP server is running and accessible
• Check MCP server URL in OpenSumi configuration
• Review MCP client integration code for errors
• Check browser/Electron console for detailed error messages

Electron App Not Starting

Symptoms: Electron window not opening, White screen, App crashes on launch

Cause: Electron build issues or IPC communication errors

Solution:

• Ensure Electron dependencies are installed correctly
• Check Electron version compatibility (15+)
• Review IPC communication setup in configuration
• Check Electron dev tools console for errors

21st.dev Magic not appearing in OpenSumi

Symptoms: Server not listed, Tools not available

Cause: Configuration or installation issue

Solution:

• Verify configuration syntax
• Check 21st.dev Magic installation
• Restart OpenSumi
• Check logs for error messages

Next Steps

Now that 21st.dev Magic is integrated with OpenSumi:

• Explore all 21st.dev Magic capabilities through OpenSumi
• Check out other MCP servers that work with OpenSumi
• Join the MCP community for tips and support
• Consider contributing to 21st.dev Magic development

Need Help?

• Search for 21st.dev Magic documentation
• Check the OpenSumi MCP guide
• Join the MCP community discussions