Magic MCP vs MCP Stl
A side-by-side look at the Magic MCP and MCP Stl 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 MCP Stl 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 MCP Stl when
- You need dedicated capabilities in the Architecture & Design domain.
- You prefer a local stdio subprocess transport.
- You want tools like
read_stl_file, get_mesh_info, write_stl.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Architecture & Design | Architecture & Design |
| Quality signal | 53/100 · Good | 44/100 · Fair |
| 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 | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 6,110 | 0 |
| Directory activity | 16 views 1 installs 0 upvotes | 0 views 0 installs 0 upvotes |
| Tools | Not listed | 33 |
| Full listing | View Magic MCP | View MCP Stl |
Tools & capabilities
Magic MCP tools
No tool names declared yet. Check the project README from the listing page.
MCP Stl tools 33
read_stl_fileRead an STL file and return mesh data (vertices, normals, bounding box)get_mesh_infoGet summary information about an STL file without loading full geometrywrite_stlWrite mesh data to an STL file (ASCII or binary format)translate_stlTranslate (move) the mesh by specified X, Y, Z offsetsrotate_stlRotate the mesh around X, Y, or Z axis by a given angle in degreesscale_stlScale the mesh by specified X, Y, Z factorsshear_stlApply a shear transformation (shift one axis per unit along another)mirror_stlMirror (reflect) the mesh across the plane perpendicular to a given axisrotate_stl_axisRotate the mesh around an arbitrary axis vector (Rodrigues' formula)combine_stlMerge multiple STL files into onearray_linearCreate N copies of the mesh spaced by a fixed X/Y/Z offsetarray_circularCreate N copies of the mesh at equal angular intervals around an axis- +21 more on 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.
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"
}
}
}
}
MCP Stl
{
"mcpServers": {
"mcp-stl": {
"command": "uvx",
"args": [
"mcp-stl"
]
}
}
}
Frequently asked questions
Magic MCP is categorized under Architecture & Design and uses a local stdio subprocess. MCP Stl belongs to Architecture & Design and uses a local stdio subprocess. Pick Magic MCP for architecture & design work and MCP Stl 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. MCP Stl 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 mcp-stl 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 6,110 GitHub stars. MCP Stl has 44/100 (Fair) with 0 views, 0 installs and 0 GitHub stars.