Magic MCP → 21st MCP

Magic MCP is now the 21st MCP. The Magic MCP server (@21st-dev/magic) has been replaced by the unified 21st MCP, installed via the 21st CLI — setup at 21st.dev/mcp. This package remains published as a thin compatibility proxy so old configs keep working.

Install the 21st MCP (recommended)

npx @21st-dev/cli@latest init --client cursor   # or: claude | vscode | windsurf | codex

Or add it manually — it is a plain HTTP MCP server:

{
  "mcpServers": {
    "21st": {
      "url": "https://21st.dev/api/mcp",
      "headers": { "x-api-key": "YOUR_21ST_API_KEY" }
    }
  }
}

Get an API key at 21st.dev/mcp.

Old Magic API keys were reset. Keys issued by the old Magic console no longer work anywhere. Generate a fresh key at 21st.dev/mcp.

What this package does now (v0.2.0+)

npx -y @21st-dev/magic@latest API_KEY="..." still works: since v0.2.0 it is a small stdio proxy that forwards every MCP message to the 21st MCP server. Existing mcp.json entries that reference @21st-dev/magic keep functioning — but they now speak to the same server as the 21st CLI, with the full current toolset.

The API key is accepted in all the historical forms: positional API_KEY="...", --API_KEY=..., /API_KEY:..., -API_KEY ..., or the TWENTY_FIRST_API_KEY / API_KEY_21ST environment variables.

Old tool names → new tool names

The 21st MCP still accepts the legacy Magic tool names and translates them, so agents that remember the old names keep working. Prefer the new names:

The current server exposes much more than the old four tools: catalog search across components/themes/templates, paid code retrieval, bookmarks, team libraries, UI generation with variants, profile management, and more. Connect and call tools/list to see the full set.

Install as a plugin

This repository is also packaged as an agent plugin (MCP server + a UI skill). You don't need to wait for any store — this repo IS a marketplace, add it directly:

# Claude Code
claude plugin marketplace add 21st-dev/magic-mcp   # then: /plugin install 21st

# Grok Build
grok plugin marketplace add 21st-dev/magic-mcp && grok plugin install 21st --trust

# Codex CLI
codex plugin marketplace add 21st-dev/magic-mcp    # then install "21st" from /plugins

Set your API key in the API_KEY_21ST variable (free key at 21st.dev/mcp).

Store listings:

• Cursor / Grok Bot — install "21st" from the Cursor Marketplace, then set your API_KEY_21ST under Plugins → Configure. Get a key at 21st.dev/mcp.
• Grok Build — grok plugin install 21st --trust (from the official xAI marketplace), then export API_KEY_21ST.
• Claude Code — the repo carries a .claude-plugin/ manifest: /plugin install it from any marketplace that lists this repo, or load locally with claude --plugin-dir . and export API_KEY_21ST.

The plugin config expects the API key in the API_KEY_21ST variable in every client.

Links

• 21st MCP setup & API keys: https://21st.dev/mcp
• 21st CLI on npm: https://www.npmjs.com/package/@21st-dev/cli
• 21st.dev — discover, publish, and generate UI components: https://21st.dev

FAQ

Why did my old Magic MCP stop working? The Magic backend (magic.21st.dev) was superseded by the unified 21st MCP, and all old API keys were reset for security. Update to a fresh key from 21st.dev/mcp — your existing @21st-dev/magic config will then work again through this compatibility proxy, though we recommend switching to npx @21st-dev/cli@latest init.

Is /ui still a thing? Use natural language: ask your agent to search 21st for components (search), or generate new UI (generate). The old /ui, /21 trigger phrases were a convention of the legacy tools' descriptions, not the protocol.