Tools

Five tools for querying the OpenAlex academic research catalog:

openalex_search_entities

Primary discovery and lookup tool. Covers all OpenAlex entity types (works, authors, sources, institutions, topics, keywords, publishers, funders).

• Retrieve a single entity by ID (OpenAlex ID, DOI, ORCID, ROR, PMID, PMCID, ISSN)
• Keyword search with boolean operators, quoted phrases, wildcards, and fuzzy matching
• Exact and AI semantic search modes
• Rich filter syntax: AND across fields, OR within fields (us|gb), NOT (!us), ranges (2020-2024), comparisons (>100)
• Sensible default field selection per entity type, applied to both searches and ID lookups — prevents oversized responses; pass select to choose fields, or ["*"] for the full record
• Invalid select field names produce an error listing the valid fields for that entity type
• Formatted MCP output is a generic markdown renderer — every returned field is surfaced without per-entity-type hard-coding
• Cursor pagination, sorting, up to 100 results per page

openalex_analyze_trends

Aggregate entities into groups and count them for trend, distribution, and comparative analysis.

• Group by any supported field (publication year, OA status, institution, country, topic, etc.)
• Combine with filters to scope the population before aggregation
• Up to 200 groups per page with cursor pagination
• Supports include_unknown to show entities with no value for the grouped field

openalex_resolve_name

Name-to-ID resolution via autocomplete. Always use this before filtering by entity — names are ambiguous, IDs are not.

• Returns up to 10 matches with disambiguation hints
• Accepts partial names and DOIs for direct lookup
• Optional entity type filter and field-level filters
• ~200ms response time

openalex_get_citation_graph

One-hop citation graph traversal from a seed work. Wraps the OpenAlex cites/cited_by/related_to filters behind an explicit direction argument so callers do not have to know the filter names.

• cites: works that cite the seed (incoming citations)
• cited_by: works the seed cites (its reference list)
• related_to: OpenAlex algorithmic "related works" (~8-30 typical, may be empty for less-cited seeds)
• Accepts OpenAlex IDs, DOIs, PMIDs, PMCIDs as seed_id; validates the seed via a singleton /works/{id} lookup before walking, so non-existent seeds surface as NotFound
• Stacks with filters/sort/select to narrow the graph (e.g., publication_year=">2020", is_oa="true")

openalex_describe_fields

Discover valid field names before constructing a query — avoids invalid-field 400 errors. Backed by a catalog generated from OpenAlex's own field validation.

• List valid fields for any entity type and context (filter, group_by, or select)
• group_by resolves to the same valid-field set as filter
• Pass query (a partial or guessed name) to rank results by name similarity — surfaces the right field when you only know roughly what you want
• Complements the ranked "did you mean" suggestions now appended to invalid-field errors on the search, trends, and citation-graph tools

Prompts

Features

Built on @cyanheads/mcp-ts-core:

• Declarative tool definitions — single file per tool, framework handles registration and validation
• Unified error handling across all tools
• Pluggable auth (none, jwt, oauth)
• Swappable storage backends via the framework (not currently used by this server)
• Structured logging with optional OpenTelemetry tracing
• Runs locally (stdio/HTTP) or in Docker from the same codebase

OpenAlex-specific:

• Typed API client with automatic ID normalization (DOI, ORCID, ROR, PMID, PMCID, ISSN, OpenAlex URLs)
• Abstract reconstruction from inverted indices — plaintext instead of OpenAlex's position-keyed encoding
• HTTP status codes mapped to specific MCP error classes (400/422 → InvalidParams, 429 → RateLimited, etc.) with upstream messages surfaced
• Timeout-aware request retries and cancellation support via AbortSignal

Project Structure

Development Guide

See CLAUDE.md for development guidelines and architectural rules. The short version:

• Handlers throw, framework catches — no try/catch in tool logic
• Use ctx.log for logging, ctx.state for storage
• Always resolve names to IDs via openalex_resolve_name before using them in filters

Getting Started

Public Hosted Instance

A public instance is available at https://openalex.caseyjhand.com/mcp — no installation required. Point any MCP client at it via Streamable HTTP:

{
  "mcpServers": {
    "openalex-mcp-server": {
      "type": "streamable-http",
      "url": "https://openalex.caseyjhand.com/mcp"
    }
  }
}

Self-Hosted / Local

Add to your MCP client config (e.g., claude_desktop_config.json):

{
  "mcpServers": {
    "openalex-mcp-server": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "@cyanheads/openalex-mcp-server"],
      "env": {
        "OPENALEX_API_KEY": "your-email@example.com"
      }
    }
  }
}

No API key needed — just provide your email to access the polite pool (10x faster rate limits).

Prerequisites

• Bun v1.3.0 or higher (for development)

Installation

1. Clone the repository:

git clone https://github.com/cyanheads/openalex-mcp-server.git

2. Navigate into the directory:

cd openalex-mcp-server

3. Install dependencies:

bun install

Configuration

Running the Server

Local Development

• Build and run the production version:

  Copy

  bun run build
  bun run start:http   # or start:stdio

• Run checks and tests:

  Copy

  bun run devcheck     # Lints, formats, type-checks
  bun run test         # Runs test suite

Docker

docker build -t openalex-mcp-server .
docker run -e OPENALEX_API_KEY=your-key -p 3010:3010 openalex-mcp-server

License

Apache-2.0 — see LICENSE for details.