Magic MCP vs Astronomy MCP Server
A side-by-side look at the Magic MCP and Astronomy MCP Server 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 Astronomy MCP Server for aerospace & astrodynamics. 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 Astronomy MCP Server when
- You need dedicated capabilities in the Aerospace & Astrodynamics domain.
- Its auth model fits you: No auth required.
- You want tools like
astronomy_get_sky_position, astronomy_get_rise_set, astronomy_get_moon_phase.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Architecture & Design | Aerospace & Astrodynamics |
| Quality signal | 53/100 · Good | 55/100 · Good |
| Install command | Confirmed | Not confirmed yet |
| Transport | Local subprocess (stdio) | — |
| Auth | API key required | No auth required |
| Pricing | Paid service | Free |
| Required env vars | TWENTY_FIRST_API_KEYAPI_KEY_21ST | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 6,227 | 3 |
| Directory activity | 16 views 1 installs 0 upvotes | 6 views 0 installs 0 upvotes |
| Tools | Not listed | 7 |
| Full listing | View Magic MCP | View Astronomy MCP Server |
Tools & capabilities
Magic MCP tools
No tool names declared yet. Check the project README from the listing page.
Astronomy MCP Server tools 7
astronomy_get_sky_positionApparent position of one body or named star: RA/Dec, alt/az, ecliptic, magnitude, phase, Sun elongation, constellationastronomy_get_rise_setRise, set, and transit times for a body, plus civil, nautical, and astronomical twilight for the Sunastronomy_get_moon_phaseIlluminated fraction, phase name, synodic age, and the next four quarter phasesastronomy_find_eventsNext eclipses, equinoxes, solstices, moon quarters, oppositions, conjunctions, greatest elongations, or apsidesastronomy_list_visibleWhat's up now: naked-eye bodies (and optional bright stars) above the horizon, ranked, with a sky-condition gateastronomy_get_ephemerisSmall-body or spacecraft ephemeris from JPL Horizons (opt-in)astronomy_get_satellite_passesVisible satellite passes from a CelesTrak element set propagated with SGP4 (opt-in)
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"
}
}
}
}
Astronomy MCP Server
No confirmed install command for Astronomy MCP Server yet — follow the setup steps linked from its listing page rather than a guessed package name.
Frequently asked questions
Magic MCP is categorized under Architecture & Design and uses a local stdio subprocess. Astronomy MCP Server belongs to Aerospace & Astrodynamics and uses an install path we have not confirmed yet. Pick Magic MCP for architecture & design work and Astronomy MCP Server for aerospace & astrodynamics.
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. Astronomy MCP Server has no confirmed install command yet — follow its own setup instructions.
Magic MCP is listed as a paid service. Auth: api key required. Astronomy MCP Server is listed as free. Auth: no auth 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 21st-dev-magic-mcp and astronomy-mcp-server 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 6,227 GitHub stars. Astronomy MCP Server has 55/100 (Good) with 6 views, 0 installs and 3 GitHub stars.