Magic MCP vs Hazmat Cfr MCP
A side-by-side look at the Magic MCP and Hazmat Cfr MCP 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 Hazmat Cfr 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 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 Hazmat Cfr MCP when
- You need dedicated capabilities in the Developer Tools domain.
- You prefer a local stdio subprocess transport.
- You want tools like
lookup_hazmat_entry, classify_shipping_description, validate_basic_hazmat_description.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Developer Tools | Developer Tools |
| Quality signal | 53/100 · Good | 61/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | API key required | Not declared |
| Pricing | Paid service | Not declared |
| Required env vars | TWENTY_FIRST_API_KEYAPI_KEY_21ST |
Tools & capabilities
Magic MCP tools
No tool names declared yet. Check the project README from the listing page.
Hazmat Cfr MCP tools 11
lookup_hazmat_entryLook up a hazardous material by UN/NA number or proper shipping name in the complete 49 CFR 172.101 Hazardous Materials Table (pinned eCFR snapshot). Returns matching entries with decoded symbols and special provisions.classify_shipping_descriptionParse a basic DOT shipping description into UN/NA number, proper shipping name, hazard class, and packing group.validate_basic_hazmat_descriptionValidate a structured DOT hazmat description against the complete 49 CFR 172.101 Hazardous Materials Table.get_label_requirementsReturn hazard label codes for a UN/NA number or proper shipping name from the complete 49 CFR 172.101 Hazardous Materials Table.check_basic_segregationRun conservative pairwise segregation warnings for supplied hazard classes using a small encoded subset of 49 CFR 177.848 logic.check_limited_quantity_eligibilityConservative helper for common Class 3/Class 8 limited quantity candidate screening. Does not certify shipment compliance.get_shipping_requirementsOne-call summary of what it takes to ship a material: identity, labels, decoded packaging references, special provisions, vessel stowage, and placarding — with citations. Looks up by UN/NA number or proper shipping name.get_placardReturn the 49 CFR 172.504 placard name and quantity threshold for a hazard class/division.decode_special_provisionDecode one or more Column 7 special-provision codes (e.g. IB2, T8, A3, 148) into their 49 CFR 172.102 text.decode_packaging_reference
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"
}
}
}
}
Hazmat Cfr MCP
{
"mcpServers": {
"hazmat-cfr-mcp": {
"command": "npx",
"args": [
"-y",
"hazmat-cfr-mcp"
]
}
}
}
Frequently asked questions
Magic MCP is categorized under Developer Tools and uses a local stdio subprocess. Hazmat Cfr MCP belongs to Developer Tools and uses a local stdio subprocess. Pick Magic MCP for developer tools work and Hazmat Cfr 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.
Magic MCP is listed as a paid service. Auth: api key required. Hazmat Cfr MCP 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 hazmat-cfr-mcp 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. Hazmat Cfr MCP has 61/100 (Good) with 2 views, 0 installs and 1 GitHub stars.
