Magic MCP vs Yetty
A side-by-side look at the Magic MCP and Yetty MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Magic MCP for developer tools work as a local process; choose Yetty for developer tools over a hosted endpoint. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Magic MCP when
- You need dedicated capabilities in the Developer Tools domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: API key required.
- You have the keys it needs:
TWENTY_FIRST_API_KEY, API_KEY_21ST.
Choose Yetty when
- You need dedicated capabilities in the Developer Tools domain.
- You prefer a remote HTTP/SSE transport.
- You have the keys it needs:
YETTY_API_KEY. - You want tools like
yetty_status, yetty_authoring_guide, yetty_pull_template.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Developer Tools | Developer Tools |
| Quality signal | 53/100 · Good | 56/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Remote HTTP/SSE |
| Auth | API key required | Not declared |
| Pricing | Paid service | Not declared |
| Required env vars | TWENTY_FIRST_API_KEYAPI_KEY_21ST | YETTY_API_KEY |
Tools & capabilities
Magic MCP tools
No tool names declared yet. Check the project README from the listing page.
Yetty tools 10
yetty_statusConnection + authentication status. Call this FIRST. Unauthenticated sessions can still park a website (batch tools) and start email sign-up — the response tells you exactly how.yetty_authoring_guideREAD THIS BEFORE WRITING OR SENDING ANY HTML (no account needed, free, instant, no arguments). Returns yetty's exact structure rules — repeated items sharing one class, semantic class names for field labels, headings before sections, no JS-rendered content — that decide whether the site converts into a clean editable CMS with named fields and add/remove collections, or a wall of generic "Text" fields.yetty_pull_templatePull a ready-made Yetty template file WITH its usage contract (no account needed, free, instant). Four boilerplates, one per store surface: template:"checkout-skeleton" (cart / checkout / thank-you markup with every data-yetty-component and data-yetty-slot mark), "account-skeleton" (the buyer's /account page in the site's own design), "order-status-skeleton" (the /order/{token} confirmation), "pay-skeleton" (the /pay/{token} frame - the payment element stays hosted and non-removable). Every file carries a commented CONDITIONAL REGIONS section showing the component logic grammar (data-yetty-when / data-yetty-each / data-yetty-state; full grammar in yetty_authoring_guide's logic_and_conditional_components chapter). Restyle freely to match the site; NEVER remove or rename data-yetty-* marks; write NO cart/checkout/account JavaScript of your own (Yetty provides the behavior); send the styled file back with the site files. (Connected Live-plan stores can additionally pull 24 gallery-<surface>-<layout> LAYOUT skeletons - different page structures over the same contract, auto-adjusted to the site's own colors and fonts.)yetty_batch_startNo account needed: start a PARKED file batch — send the site now, authenticate after. Returns park_ref (use it as batch_ref). Files are stored safely but NOT processed until the owner approves by email. EXAMPLE: yetty_batch_start {} -> {park_ref:"pk_..."} -> yetty_batch_file {batch_ref:"pk_...", path:"index.html", content:"..."} per file -> yetty_batch_end {batch_ref:"pk_..."} -> yetty_signup {email:"owner@x.com", park_ref:"pk_..."} -> owner clicks the email -> yetty_claim_status {park_ref:"pk_..."} gives you an API key + the build status.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Magic MCP
{
"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"
}
}
}
}
Yetty
{
"mcpServers": {
"yetty": {
"url": "https://mcp.yetty.ai/mcp"
}
}
}
Frequently asked questions
Magic MCP is categorized under Developer Tools and uses a local stdio subprocess. Yetty belongs to Developer Tools and uses a remote HTTP/SSE transport. Pick Magic MCP for developer tools work and Yetty for developer tools.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Magic MCP is listed as a paid service. Auth: api key required. Yetty has no declared pricing — check the project's own site. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add 21st-dev-magic-mcp and yetty as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Magic MCP has a quality signal of 53/100 (Good) with 16 views, 1 installs and 5,997 GitHub stars. Yetty has 56/100 (Good) with 1 views, 0 installs and 0 GitHub stars.