Magic MCP vs Cadlens MCP
A side-by-side look at the Magic MCP and Cadlens 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 architecture & design work as a local process; choose Cadlens MCP for architecture & design 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 Architecture & Design 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 Cadlens MCP when
- You need dedicated capabilities in the Architecture & Design domain.
- You prefer a local stdio subprocess transport.
- You have the keys it needs:
CADLENS_API_KEY. - You want tools like
cadlens_parse_file, cadlens_parse_url, cadlens_get_job.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Architecture & Design | Architecture & Design |
| Quality signal | 53/100 · Good | 52/100 · 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 | CADLENS_API_KEY |
| Verified owner | Community listing | Community listing |
| GitHub stars | 6,138 | 1 |
| Directory activity | 16 views 1 installs 0 upvotes | 0 views 0 installs 0 upvotes |
| Tools | Not listed | 7 |
| Full listing | View Magic MCP | View Cadlens MCP |
Tools & capabilities
Magic MCP tools
No tool names declared yet. Check the project README from the listing page.
Cadlens MCP tools 7
cadlens_parse_fileUpload a local CAD file, poll until parsed (5 min budget), return summary.cadlens_parse_urlDownload a CAD file from a URL, then parse it like `parse_file`.cadlens_get_jobCheap status check (`PENDING` / `PROCESSING` / `COMPLETED` / `FAILED`).cadlens_get_resultFetch parsed content. `mode`: `summary` (default), `entities_by_type`, `entities_on_layer`, `full`.cadlens_refresh_image_urlRe-fetch the 1h presigned PNG URL without re-downloading the full result.cadlens_list_jobsThe 100 most recent jobs for the configured API key.cadlens_delete_jobDelete a job and its S3 artifacts. Irreversible.
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"
}
}
}
}
Cadlens MCP
{
"mcpServers": {
"cadlens-mcp": {
"command": "npx",
"args": [
"-y",
"@cadlens/mcp-server"
],
"env": {
"CADLENS_API_KEY": "YOUR_CADLENS_API_KEY_HERE"
}
}
}
}
Frequently asked questions
Magic MCP is categorized under Architecture & Design and uses a local stdio subprocess. Cadlens MCP belongs to Architecture & Design and uses a local stdio subprocess. Pick Magic MCP for architecture & design work and Cadlens MCP for architecture & design.
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. Cadlens 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 cadlens-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 6,138 GitHub stars. Cadlens MCP has 52/100 (Good) with 0 views, 0 installs and 1 GitHub stars.