Magic MCP vs LEEVAR reliability battery

In-depth architectural comparison of the Magic MCP and LEEVAR reliability battery 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.

Which MCP Server Should You Choose?

Choose Magic MCP when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: API Key required (Paid Service).
• You have access to required keys: TWENTY_FIRST_API_KEY, API_KEY_21ST.
• Primary tools included: UI component generation, Component, theme, and template search, Design inspiration lookup.

Explore Magic MCP Details

L

Choose LEEVAR reliability battery when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore LEEVAR reliability battery Details

Feature & Specification Comparison

Specification	Magic MCP 21st-dev Developer Tools	L LEEVAR reliability battery Developer Tools
Summary	Create crafted UI components inspired by the best 21st.dev design engineers.	Grade an AI agent's transcripts on 18 reliability tests. Thin evidence is NOT TESTED, not guessed.
Category & Scope	Developer Tools	Developer Tools

Tools & Capabilities Breakdown

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).

{
  "mcpServers": {
    "21st-dev-magic-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@21st-dev/cli@latest"
      ],
      "env": {
        "TWENTY_FIRST_API_KEY": "YOUR_TWENTY_FIRST_API_KEY_HERE",
        "API_KEY_21ST": "YOUR_API_KEY_21ST_HERE"
      }
    }
  }
}

{
  "mcpServers": {
    "leevar-reliability-battery": {
      "command": "npx",
      "args": [
        "-y",
        "leevar-reliability-battery"
      ]
    }
  }
}

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