OpenRepro ledger MCP Server

by openrepro Your server? Claim it

answering

OpenRepro ledger is answering right now. Last checked 12 min ago. It exposes 5 tools.

Does a paper reproduce? Read-only lookup of OpenRepro's re-run reports, claims and evidence.

Uptime history 19 hours of history

19 hours agonow

100.0%

Uptime 24h

69 of 69 checks

Tools

read from the server

181 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check OpenRepro ledger every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 12 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add ledger --transport http https://mcp.openrepro.org/mcp

Settings → Connectors → Add custom connector, then paste this address

https://mcp.openrepro.org/mcp

~/.codex/config.toml

[mcp_servers.ledger]
url = "https://mcp.openrepro.org/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "ledger": {
      "url": "https://mcp.openrepro.org/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "ledger": {
      "type": "http",
      "url": "https://mcp.openrepro.org/mcp"
    }
  }
}

Available tools 5

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

how

how_to_verify

The log's final hash, the downloadable evidence bundle, the report's SHA-256 from the release manifest, and the one command that checks the bundle with only Python. The verifier checks log and artifact integrity and that the report names the log's head hash; it does not check the report's contents against the log.

paper

check_paper

Look up one paper in the OpenRepro ledger and return its re-run outcome with its qualifiers (such as a broad bound or a check that missed), how many agent-designated controls were excluded and how many gates the test had (when it has any), how many headline claims held, the assurance level, and links to the report and evidence. Matches arXiv IDs, DOIs, URLs, titles, short names and aliases. With no exact match it returns close matches when there are any, and says the paper is not in the ledger only when there are none.

report

get_report

The full public record for one paper: outcome and qualifiers, summary, assurance, the attempt history (released and superseded versions with reasons), every claim checked with the published value, the re-run value, the registered tolerance, the check kind and the verdict, plus evidence links.

reports

search_reports

Search published re-runs by words in the title, authors, venue or field, optionally filtered by outcome or field. With no query, lists the whole ledger.

request

request_rerun

For a paper not yet in the ledger: returns a ready-to-send email link to OpenRepro with the request filled in. Nothing is sent or stored by this tool; the user sends the email if they want to.

Endpoints

URL	Transport	State	Latency	Checked
https://mcp.openrepro.org/mcp	streamable-http	answering	223 ms	12 min ago

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OpenRepro ledger — questions

Answers built from our own checks of this server.

What can OpenRepro ledger do?

It exposes 5 tools, read directly from the server on our last check. Among them: check_paper, get_report, how_to_verify, request_rerun, search_reports. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is OpenRepro ledger working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 69 of 69 checks got a reply (100.0%), average response time 181 ms. The bar chart above shows every period we have measured.

How do I connect OpenRepro ledger?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does OpenRepro ledger need an API key?

No. OpenRepro ledger completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 5 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is OpenRepro ledger?

It answers our handshake in 181 ms on average, which is faster than 74% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.