Crossref vs Exa MCP Server
A side-by-side look at the Crossref and Exa 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 Crossref for research work as a local process; choose Exa MCP Server for search & data extraction as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Crossref when
- You need dedicated capabilities in the Research domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: No auth required.
- You want tools like
search_works, get_work, get_journal.
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.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Research | Search & Data Extraction |
| Quality signal | 60/100 · Good | 73/100 · 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 | 0 | 5,162 |
| Directory activity | 3 views 0 installs 0 upvotes | 11 views 0 installs 0 upvotes |
| Tools | 3 | 2 |
| Full listing | View Crossref | View Exa MCP Server |
Tools & capabilities
Crossref tools 3
search_worksSearch academic papers, books, and datasets via Crossref. For "search works titled X" / finding a SPECIFIC paper by its title, pass `title` (title-scoped — ranks the exact paper first). Beyond keyword search you can SORT by citation count or publication date and FILTER by date range, work type, author, and JOURNAL (`journal` = a journal name like "Progress in Materials Science" or an ISSN; results are restricted to that journal only) — e.g. "most-cited papers on transformers" (sort=citations), "papers on LLMs since 2024" (from_date=2024-01-01), "recent journal articles by an author". Returns titles, authors, journal, DOIs, citation counts, and dates.get_workGet full metadata for a publication by DOI (e.g., "10.1038/nature12373"). Returns title, authors, abstract, journal, publisher, citations, and subjects.get_journalGet the 5 most recent works from a journal by ISSN (e.g., "2041-1723"). Returns titles, authors, DOIs, and publication dates.
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).
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.
Crossref
{
"mcpServers": {
"crossref-2": {
"command": "npx",
"args": [
"-y",
"@pipeworx/mcp-crossref"
]
}
}
}
Exa MCP Server
{
"mcpServers": {
"exa-labs-exa-mcp-server": {
"command": "npx",
"args": [
"-y",
"exa-mcp-server"
]
}
}
}
Frequently asked questions
Crossref is categorized under Research and uses a local stdio subprocess. Exa MCP Server belongs to Search & Data Extraction and uses a local stdio subprocess. Pick Crossref for research work and Exa MCP Server for search & data extraction.
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.
Crossref is listed as free. Auth: no auth required. Exa 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 crossref-2 and exa-labs-exa-mcp-server as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Crossref has a quality signal of 60/100 (Good) with 3 views, 0 installs and 0 GitHub stars. Exa MCP Server has 73/100 (Great) with 11 views, 0 installs and 5,162 GitHub stars.