intermediate⏱️ 22-32 minutes📅 Updated June 2026

Step-by-step guide to integrate 21st.dev Magic MCP server with Claude.ai. Includes ai-powered ui generation and real-time component preview.

21st.dev Magic + Claude.ai: 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 Claude.ai, 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 Claude.ai, 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 Claude.ai
  • 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
  • Claude.ai installed and configured
  • Compatible operating system (Web Browser)

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 Claude.ai

  1. Open Claude.ai 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 Claude.ai:

Create Navigation Bar

Generate a modern responsive navigation component

Ask Claude.ai: "/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 Claude.ai: "/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 Claude.ai: "/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 Claude.ai: "/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. Start a new conversation in Claude.ai
  2. Ask Claude.ai to list available tools
  3. Try using 21st.dev Magic functionality

Test prompts:

  • "What tools are available to me right now?"
  • "Can you use 21st.dev Magic to help me with {example_task}?"
  • "Show me the capabilities from my connected MCP servers"

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

Cannot Find MCP Settings

Symptoms: No MCP option in settings, Integration menu missing

Cause: Feature may not be available in current web interface version

Solution:

  • Check if your account has access to MCP features
  • Try accessing from different browser or clearing cache
  • Contact Anthropic support for account feature access

Server Connection Failed

Symptoms: Connection timeout, Server unreachable errors

Cause: Network connectivity or server configuration issues

Solution:

  • Verify server URL is correct and accessible
  • Check if server requires authentication
  • Ensure server supports web client connections
  • Test server connectivity from other clients

Tools Not Appearing

Symptoms: Server connected but no tools available, Empty tools list

Cause: Server connected but not properly exposing tools

Solution:

  • Verify server is properly configured and running
  • Check server logs for tool registration issues
  • Refresh connection or reconnect to server
  • Ensure server implements MCP protocol correctly

21st.dev Magic not appearing in Claude.ai

Symptoms: Server not listed, Tools not available

Cause: Configuration or installation issue

Solution:

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

Next Steps

Now that 21st.dev Magic is integrated with Claude.ai:

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

Need Help?

Related Resources

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Need Help?

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21st.dev Magic + Claude.ai: MCP Setup Guide (2026)