NobleBlocks MCP Server: Search 340 Million Academic Papers Directly from Claude

Today we're launching the NobleBlocks MCP (Model Context Protocol) server — giving Claude, and any MCP-compatible AI assistant, direct access to our database of 340 million academic papers spanning PubMed, arXiv, Semantic Scholar, OpenAlex, Crossref, DOAJ, Europe PMC, and clinical trials registries.

This means you can now search, filter, and discover research papers without leaving your AI conversation. Ask Claude to find papers on any topic, filter by year, citation count, or source — and get real, cited results with DOIs, abstracts, and metadata.

What is MCP and why does it matter for research?

The Model Context Protocol (MCP) is an open standard that lets AI assistants like Claude connect to external tools and data sources. Think of it as a USB port for AI — instead of the AI relying solely on its training data, MCP lets it query live databases, APIs, and services in real time.

For researchers, this is transformative. Instead of switching between Claude and your browser, copying and pasting search results, or hoping the AI's training data includes your niche topic — you can simply ask and get live, verified results from the world's largest academic databases.

What you can do with the NobleBlocks MCP server

• Search 340M+ papers across 8 academic databases with natural language queries
• Filter by publication year (e.g., "papers published after 2023")
• Filter by citation count (e.g., "at least 50 citations")
• Filter by source database (PubMed, arXiv, OpenAlex, Semantic Scholar, Clinical Trials, Crossref, DOAJ, Europe PMC)
• Sort results by relevance, date, or citation count
• Get full paper metadata: title, authors, abstract, DOI, venue, year, and citation count
• Explore the knowledge graph — find connections between genes, drugs, diseases, and institutions
• Fetch detailed information on any paper by DOI, PMID, or arXiv ID

How to set up NobleBlocks MCP in Claude Desktop

Setting up the NobleBlocks MCP server takes less than two minutes. Add this to your Claude Desktop configuration file (claude_desktop_config.json):

For macOS/Linux, the config is at: ~/Library/Application Support/Claude/claude_desktop_config.json

Add the following to your mcpServers section:

{ "mcpServers": { "nobleblocks": { "command": "npx", "args": ["-y", "mcp-remote", "https://mcp.nobleblocks.com/mcp"] } } }

Restart Claude Desktop, and you'll see the NobleBlocks tools available in your conversation. No API key required for basic search — just install and start asking questions.

Example queries that work right now

• "Find recent papers on CRISPR gene editing published after 2023"
• "Search for highly-cited papers on transformer architectures with at least 100 citations"
• "What are the latest clinical trials for Alzheimer's disease treatments?"
• "Find papers by Yoshua Bengio on deep learning from 2020 onwards"
• "Search PubMed for meta-analyses on cardiovascular disease prevention"
• "Show me the most cited papers on large language models"
• "Find open access papers on climate change impacts published in Nature"

How it compares to searching manually

Technical details for developers

The NobleBlocks MCP server implements the full MCP specification with three core tools:

1. search_papers — Full-text search with filters (query, limit, min_year, max_year, min_citations, sort, source)
2. get_paper — Fetch complete metadata for any paper by DOI, PMID, arXiv ID, or OpenAlex ID
3. search_by_entity — Knowledge graph exploration: find connections between biomedical entities, institutions, and concepts

The server is hosted at https://mcp.nobleblocks.com/mcp and uses Server-Sent Events (SSE) for streaming responses. It's compatible with Claude Desktop, Cursor, Windsurf, and any client that supports the MCP remote transport.

What's next

• Literature review generation directly from Claude (systematic, narrative, or scoping review styles)
• Citation graph traversal — explore what a paper cites and what cites it
• Full-text PDF analysis through the MCP connection
• Collaborative research workflows with shared search histories

The MCP server is free to use for search queries. Advanced features like literature review generation require a NobleBlocks account with credits.

Watch: NobleBlocks MCP in action