by 21st-dev
Magic MCP UI builder by 21st.dev. Requires an API key generated from https://21st.dev/magic/console to operate.
Repository-wide counts · Cached 2025-10-28
The 21st.dev Magic AI Agent MCP server is a publicly available project. Review the upstream repository for installation instructions, supported tools, compatibility, permissions, and current maintenance status.
Configuration, transport, authentication, and runtime requirements vary by project. Open the repository before connecting and use the smallest set of credentials and permissions required.
Open the 21st.dev Magic AI Agent repository to read the latest documentation.
Compare source, connection, and authentication details before choosing an implementation.
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upstash
Context7 MCP server providing up-to-date, version-specific documentation and code examples for libraries, enabling coding agents to fetch accurate docs and code snippets. Requires an API key for higher rate limits, passed via CONTEXT7_API_KEY header.
Microsoft Corporation
A Model Context Protocol (MCP) server that provides browser automation capabilities using Playwright. Enables LLMs to interact with web pages through structured accessibility snapshots, bypassing the need for screenshots or visually-tuned models.
feder-cr
AIHawk is an anti detect browser and web browsing agent, open source, with an MCP server for coding agents: undetected, no captchas, no blocks. It requires an OpenRouter API key for the standalone web UI mode, which can be provided via the --openrouter-key flag or the OPENROUTER_API_KEY environment variable or a .env file in the running directory.
Build-time snapshot · Retrieved 2026-10-05
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@21st-dev/magic) has been replaced by the unified 21st MCP, installed via the 21st CLI — setup at 21st.dev/mcp.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.
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.
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 tools available to the authenticated account.
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.
Builder component access does not enable hosted 21st AI. The server lists
generate and iterate_generation only when AI access is enabled. Check
get_usage.aiGenerationEnabled; this reports access, not the remaining AI
credit balance. With AI off, use search and get_component, then adapt the
code with your own coding agent. Existing drafts remain readable.
A cached or legacy generation call can return ai_subscription_required. Do
not retry until AI is enabled. Refresh the client tool list or reconnect after
enabling AI. The proxy forwards discovery to the server, so existing proxy
versions receive this behavior without an npm update.
server.json mirrors the official dev.21st/mcp registry listing. The registry
version is independent of this compatibility package version.
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:
| Legacy Magic tool | 21st MCP tool |
|---|---|
21st_magic_component_builder |
generate |
21st_magic_component_inspiration |
get_inspiration |
21st_magic_component_refiner |
generate (new generation from the refinement prompt) |
logo_search |
search_logo (one query per call) |
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 tools available to your account.
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:
API_KEY_21ST under Plugins → Configure. Get a key at 21st.dev/mcp.grok plugin install 21st --trust (from the official xAI marketplace), then export API_KEY_21ST..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.
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 use hosted UI generation (generate) when AI is enabled. The old /ui, /21 trigger phrases were a convention of the legacy tools' descriptions, not the protocol.