21st-dev/magic-mcp is a compatibility proxy that lets coding agents access the 21st MCP, a server for finding and generating React and Tailwind UI components. It is intended for users of older Magic MCP configurations that need to keep working with the unified 21st MCP service. The catalogue entry is an MCP integration for that workflow.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
git clone --depth 1 https://github.com/21st-dev/magic-mcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/mcp/21st-dev/magic-mcp/21st)<a href="https://agentmods.dev/mcp/21st-dev/magic-mcp/21st"><img src="https://agentmods.dev/badge/mcp/21st-dev/magic-mcp/21st/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/mcp/21st-dev/magic-mcp/21st"><img src="https://agentmods.dev/badge/mcp/21st-dev/magic-mcp/21st.svg" alt="Reviewed on agentmods" width="80" height="20"></a>Grade A, and why
21st scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
{
"21st": {
"url": "https://21st.dev/api/mcp",
"headers": {
"x-api-key": "${API_KEY_21ST}"
}
}
}What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 8 lines scan A 0eb5cf738a8a
21st is an MCP server published in the GitHub repository 21st-dev/magic-mcp (6,086 stars, last pushed 1mo ago), licensed ISC. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-02.
Other mcp servers, from other repositories
slack-mcp-server
Catch up on Slack without reading it. Unreads, threads, search. Browser-session or hosted OAuth. Runs locally from the @jtalk22/slack-mcp npm package. Needs 2 environment variables to run.
tailscale-mcp
Tailscale MCP server for managing your tailnet from AI assistants. Runs locally from the @yawlabs/tailscale-mcp npm package.
buywhere
Stdio bridge to the hosted BuyWhere MCP server — 300M+ products, 150,000+ stores, deliverto ranking. Runs locally from the @buywhere/mcp-server npm package. Needs 1 environment variable to run.
subio-scrape
MCP server "subio-scrape" as configured in alijancb/subio-mcp. Runs locally from the @subio/mcp npm package.
usercall
MCP server "usercall", hosted remotely at mcp.usercall.co, as configured in junetic/usercall-mcp.
fonto-docs
Fonto (FontoXML) documentation for AI tools. Converts DITA XML to Markdown on demand. Remote server at fonto-docs.elliat.nl.