Carbon vs Magic MCP
A side-by-side look at the Carbon and Magic MCP MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Carbon for developer tools work over a hosted endpoint; choose Magic MCP for developer tools as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Carbon when
- You need dedicated capabilities in the Developer Tools domain.
- You prefer a remote HTTP/SSE transport.
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.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Developer Tools | Developer Tools |
| Quality signal | 35/100 · Fair | 53/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Remote HTTP/SSE | Local subprocess (stdio) |
| Auth | Not declared | API key required |
| Pricing | Not declared | Paid service |
| Required env vars | None listed | TWENTY_FIRST_API_KEYAPI_KEY_21ST |
Tools & capabilities
Carbon tools
No tool names declared yet. Check the project README from the listing page.
Magic MCP tools
No tool names declared yet. Check the project README from the listing page.
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.
Carbon
{
"mcpServers": {
"carbon": {
"url": "https://mcp.carbondatasolutions.com/mcp"
}
}
}
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"
}
}
}
}
Frequently asked questions
Carbon is categorized under Developer Tools and uses a remote HTTP/SSE transport. Magic MCP belongs to Developer Tools and uses a local stdio subprocess. Pick Carbon for developer tools work and Magic MCP 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.
Carbon has no declared pricing — check the project's own site. Magic MCP is listed as a paid service. Auth: api key required. 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 carbon and 21st-dev-magic-mcp as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Carbon has a quality signal of 35/100 (Fair) with 0 views, 0 installs and 0 GitHub stars. Magic MCP has 53/100 (Good) with 16 views, 1 installs and 5,997 GitHub stars.
