Magic MCP vs Product Cli

In-depth architectural comparison of the Magic MCP and Product Cli 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

Choose Product Cli 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).
• Primary tools included: Machine-readable What/How graph for an entire software system, Domain modeling: entities, commands, events, read models, Deciders, Projectors, MCP server mode alongside the CLI (product mcp --http).

Feature & Specification Comparison

Specification	Magic MCP 21st-dev Developer Tools	Product Cli Developer Tools
Summary	Create crafted UI components inspired by the best 21st.dev design engineers.	Knowledge graph CLI for managing features, ADRs, and test criteria as MCP-discoverable artifacts.
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": {
    "product-cli": {
      "command": "npx",
      "args": [
        "-y",
        "product-cli"
      ]
    }
  }
}

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