MCP server

Opencitations

io.github.pipeworx-io/opencitations

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

OpenCitations MCP — citation index (COCI + general Index API).

Website Source

At a glance

Type

MCP server

Publisher

pipeworx.io (verified by the MCP Registry)

Status

Working at last check

Tools

48

Token cost

About 27,077 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http opencitations https://gateway.pipeworx.io/opencitations/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.opencitations]
url = "https://gateway.pipeworx.io/opencitations/mcp"

Gemini CLI

{"mcpServers":{"opencitations":{"httpUrl":"https://gateway.pipeworx.io/opencitations/mcp"}}}

Cursor

{"mcpServers":{"opencitations":{"url":"https://gateway.pipeworx.io/opencitations/mcp"}}}

VS Code

{"servers":{"opencitations":{"type":"http","url":"https://gateway.pipeworx.io/opencitations/mcp"}}}

Antigravity

agy mcp add opencitations https://gateway.pipeworx.io/opencitations/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"opencitations","server_url":"https://gateway.pipeworx.io/opencitations/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"opencitations","server_url":"https://gateway.pipeworx.io/opencitations/mcp"}

Tools

• citation ~126 tokens
  Fetch one citation record by its Open Citation Identifier (OCI — a compound ID of the form citing-DOI__cited-DOI). Returns citing/cited DOI pair, creation date, and journal self-citation flag. Use `citations` or `references` instead when you only have a DOI.
• citation_count ~115 tokens
  "How many times has paper [DOI] been cited" / "citation count for [paper]" / "is [study] highly cited" — incoming citation count for a DOI. Fast version of `citations` when you only need the number, not the citing DOIs.
• citations ~146 tokens
  "Who cites paper [DOI]" / "what papers reference [DOI]" / "incoming citations to [paper]" / "what work has cited [study]" — DOIs that CITE the given DOI (reverse-direction from references). Use for impact analysis, follow-on research discovery, "is this paper influential" questions.
• metadata ~149 tokens
  "Get paper info for [DOI]" / "bibliographic details for [paper]" / "title / authors / year of [DOI]" — bibliographic metadata for one or more DOIs (up to 50 at once). Returns title, authors, year, journal, publisher.
• references ~130 tokens
  "What does paper [DOI] cite" / "references in [paper]" / "what sources does this paper use" — DOIs cited BY the given DOI (the paper's reference list / bibliography). Use for citation-graph traversal, literature review, source tracking.
• references_count ~108 tokens
  "How many references does paper [DOI] have" / "how big is the bibliography of [paper]" — outgoing reference count for a DOI. Fast version of `references` when you only need the number.

Browse

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