Exa MCP Server vs Astronomy Oracle
A side-by-side look at the Exa MCP Server and Astronomy Oracle MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Exa MCP Server for search & data extraction work as a local process; choose Astronomy Oracle for aerospace & astrodynamics as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Exa MCP Server when
- You need dedicated capabilities in the Search & Data Extraction domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: No auth required.
- You want tools like
web_search_exa, web_fetch_exa.
Choose Astronomy Oracle when
- You need dedicated capabilities in the Aerospace & Astrodynamics domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: No auth required.
- You want tools like
lookup_object, search_objects, plan_session.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Search & Data Extraction | Aerospace & Astrodynamics |
| Quality signal | 73/100 · Great | 65/100 · Great |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | No auth required | No auth required |
| Pricing | Free | Free |
| Required env vars | None listed | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 5,150 | 3 |
| Directory activity | 10 views 0 installs 0 upvotes | 7 views 1 installs 0 upvotes |
| Tools | 2 | 3 |
| Full listing | View Exa MCP Server | View Astronomy Oracle |
Tools & capabilities
Exa MCP Server tools 2
web_search_exaSearch the web for any topic and get clean, ready-to-use content. Best for: Finding current information, news, facts, people, companies, or answering questions about any topic. Returns: Clean text content from top search results. Query tips: describe the ideal page, not keywords. "blog post comparing React and Vue performance" not "React vs Vue". Use category:people / category:company to search through Linkedin profiles / companies respectively. If highlights are insufficient, follow up with web_fetch_exa on the best URLs.web_fetch_exaRead a webpage's full content as clean markdown. Use after web_search_exa when highlights are insufficient or to read any URL. Best for: Extracting full content from known URLs. Batch multiple URLs in one call. Returns: Clean text content and metadata from the page(s).
Astronomy Oracle tools 3
lookup_objectLook up a celestial object by Messier number (e.g. M31), NGC/IC designation (e.g. NGC7000), or common name (e.g. Andromeda Galaxy). Optionally compute visibility from a given location and time.search_objectsSearch and filter the celestial object catalog by type, constellation, magnitude, angular size, or catalog membership. Returns a formatted table of matching objects sorted by brightness.plan_sessionGenerate an observing session plan for a given location and date. Returns the best celestial objects to observe grouped by time window (evening, midnight, pre-dawn), scored by observability.
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.
Exa MCP Server
{
"mcpServers": {
"exa-labs-exa-mcp-server": {
"command": "npx",
"args": [
"-y",
"exa-mcp-server"
]
}
}
}
Astronomy Oracle
{
"mcpServers": {
"gregario-astronomy-oracle": {
"command": "npx",
"args": [
"-y",
"astronomy-oracle"
]
}
}
}
Frequently asked questions
Exa MCP Server is categorized under Search & Data Extraction and uses a local stdio subprocess. Astronomy Oracle belongs to Aerospace & Astrodynamics and uses a local stdio subprocess. Pick Exa MCP Server for search & data extraction work and Astronomy Oracle 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.
Exa MCP Server is listed as free. Auth: no auth required. Astronomy Oracle 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 exa-labs-exa-mcp-server and gregario-astronomy-oracle as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Exa MCP Server has a quality signal of 73/100 (Great) with 10 views, 0 installs and 5,150 GitHub stars. Astronomy Oracle has 65/100 (Great) with 7 views, 1 installs and 3 GitHub stars.