MCP server

Cern Opendata

io.github.cyanheads/cern-opendata-mcp-server

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

Search CERN Open Data, fetch records, files, analysis environments, CMS good-run lists, HLT paths.

Source

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

7

Token cost

About 4,584 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 cern-opendata-mcp-server https://cern-opendata.caseyjhand.com/mcp

Claude Desktop

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

Codex (config.toml)

[mcp_servers.cern-opendata-mcp-server]
url = "https://cern-opendata.caseyjhand.com/mcp"

Gemini CLI

{"mcpServers":{"cern-opendata-mcp-server":{"httpUrl":"https://cern-opendata.caseyjhand.com/mcp"}}}

Cursor

{"mcpServers":{"cern-opendata-mcp-server":{"url":"https://cern-opendata.caseyjhand.com/mcp"}}}

VS Code

{"servers":{"cern-opendata-mcp-server":{"type":"http","url":"https://cern-opendata.caseyjhand.com/mcp"}}}

Antigravity

agy mcp add cern-opendata-mcp-server https://cern-opendata.caseyjhand.com/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":"cern-opendata-mcp-server","server_url":"https://cern-opendata.caseyjhand.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"cern-opendata-mcp-server","server_url":"https://cern-opendata.caseyjhand.com/mcp"}

Tools

• cern_opendata_get_analysis_env ~258 tokens
  Assemble what is needed to analyse a record: its container images, CMSSW release and global tag; the condition-data, VM and validated-run records for its run periods; example software that declares it works with the record; and quoted sections of the guides the record links (the first two are fetche
• cern_opendata_get_records ~585 tokens
  Fetch full metadata for 1-20 records in one call, by recid, DOI, CMS dataset path (/Primary/Era/TIER) or documentation slug. Returns the description, run periods, collision and distribution details, related records, a software-environment summary, the license and a ready citation, plus what a record
• cern_opendata_get_validated_runs ~588 tokens
  Get a CMS validated-run (good-run) list, which certifies the luminosity sections that are good for physics in each run. Select it by a CMS collision dataset recid, a validated-run list recid, or a run period such as Run2012B (give exactly one of recid and run_period). Choose the full validation or t
• cern_opendata_list_files ~398 tokens
  List one record's files: its file indexes (groups of up to ~1,500 files) with their XRootD URI-list URLs, and per file the XRootD URI, HTTPS download URL, size, adler32 checksum and availability. Without index, returns the record's indexes and its regular files; with index, reads only that index and
• cern_opendata_list_reference ~288 tokens
  Decode the vocabulary the other cern_opendata tools accept: experiments, record types, collision energies and types, file formats and data tiers, availability states, physics categories, LHCb magnet polarities and stripping streams and versions, identifier forms, query syntax, licensing, and the CMS
• cern_opendata_search_records ~1764 tokens
  Search the CERN Open Data Portal's datasets, software, environments, documentation and supplementary records with exact-vocabulary filters and an optional full-text query. The filters are experiment, record type, physics category, keyword, collision energy and type, file format, data-taking year, ev
• cern_opendata_search_trigger_paths ~703 tokens
  Look up CMS High-Level Trigger paths by exact name (HLT_IsoMu24) or prefix pattern (HLT_IsoMu*), optionally for one data-taking year. Paths outside the HLT_ family, such as AlCa_EcalPi0, DST_ and DQM_ paths, output modules and HLTriggerFinalPath, are found by their own names, in the case given. Each

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