A2a Auditor vs Magic MCP
A side-by-side look at the A2a Auditor and Magic MCP MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
A
A2a AuditorDeveloper ToolsScans Agent2Agent (A2A) protocol code for webhook SSRF, missing auth, and credential exposure33EmergingAuth: not declaredVerdict: choose A2a Auditor for developer tools work; 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?
AChoose A2a Auditor when
- You need dedicated capabilities in the Developer Tools domain.
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 | A A2a Auditor | |
|---|---|---|
| Category | Developer Tools | Developer Tools |
| Quality signal | 33/100 · Emerging | 53/100 · Good |
| Install command | Not confirmed yet | Confirmed |
| Transport | — | Local subprocess (stdio) |
| Auth | Not declared | API key required |
| Pricing | Not declared | Paid service |
| Required env vars | None listed | TWENTY_FIRST_API_KEY |
Tools & capabilities
A2a Auditor 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.
A2a Auditor
No confirmed install command for A2a Auditor yet — follow the setup steps linked from its listing page rather than a guessed package name.
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
A2a Auditor is categorized under Developer Tools and uses an install path we have not confirmed yet. Magic MCP belongs to Developer Tools and uses a local stdio subprocess. Pick A2a Auditor 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. A2a Auditor has no confirmed install command yet — follow its own setup instructions.
A2a Auditor 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 a2a-auditor and 21st-dev-magic-mcp as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, A2a Auditor has a quality signal of 33/100 (Emerging) with 0 views, 0 installs and 1 GitHub stars. Magic MCP has 53/100 (Good) with 16 views, 1 installs and 5,997 GitHub stars.