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Metis Check

Registre officiel Autres

Checks an answer's citations at the registries that issue them. Every check files a signed report.

Code source Site web Documentation

Installation

Ajoutez ceci à la configuration MCP de votre client (Claude Desktop : claude_desktop_config.json ; Cursor : .cursor/mcp.json ; VS Code et les autres utilisent la même forme « mcpServers »).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http metis-check 'https://check-api.metisfoundry.com/mcp/check'
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "metis-check": {
            "type": "http",
            "url": "https://check-api.metisfoundry.com/mcp/check"
        }
    }
}

Documentation

Tirée du README du projet sur GitHub, actualisée chaque semaine. Les liens ouvrent GitHub.

Sommaire
  1. Metis Check
  2. Install
  3. Try it in one click
  4. What you get
  5. Plans
  6. Repository layout
  7. Support and license

Metis Check

The check every cited AI answer needs before you rely on it. A citation that looks complete and points to nothing costs a correction, a retraction or a sanction. Metis Check asks the registries that issue each identifier whether it exists and what it says. DOI, PubMed, arXiv, ORCID, ROR, ISBN, LEI, ISIN, CUSIP, SEC CIK, EIN, NPI, UK company numbers, domains and more. Each identifier comes back in exactly one of four states: settled true, settled false, not decidable (a person decides) or unreachable (a delay, not evidence). Every check ends in a signed report with its own id, a PDF and a recheck button anyone can press.

By Metis Foundry. One account covers ChatGPT, Codex, Claude, Claude Code, Cursor and VS Code. Every account starts with 5 checks a month; plans.

A real report: three identifiers settled true, one settled false. Open it and press Recheck.

Install

ClientHow
Claude (web, desktop, mobile)Settings → Connectors → add a connector by URL: https://mcp.metisfoundry.com/mcp. Once Metis Check is listed in the connectors directory, choose it there.
Claude Code/plugin marketplace add MetisFoundry/metis-plugins then /plugin install metis-check@metis, or claude mcp add --transport http metis-check https://mcp.metisfoundry.com/mcp
Codex CLIcodex plugin marketplace add MetisFoundry/metis-plugins then codex plugin add metis-check@metis
ChatGPTThe Metis Check plugin is submitted to the OpenAI directory. Until it is listed: Settings → Connectors → add by address https://check-api.metisfoundry.com/mcp/check
CursorAdd to Cursor
VS CodeAdd to VS Code (web redirect), or code --add-mcp '{"name": "metis-check", "type": "http", "url": "https://check-api.metisfoundry.com/mcp/check"}'
Any MCP clientRemote server https://check-api.metisfoundry.com/mcp/check (OAuth sign-in; a free account is created on first connection). Registry name com.metisfoundry/metis-check.

Sign in or create a free Metis account when the client asks.

Try it in one click

The prompt asks Metis Check to check four references, one of them invented. The invented one comes back settled false, with the registry that said so.

What you get

  • Four states, nothing hidden: settled true, settled false, not decidable, unreachable, and a not-checked list with the reason for each.
  • A report that rechecks without Metis: every line carries the registry query and the SHA-256 of the registry's answer; signed JSON and a PDF.
  • Shareable: anyone with the link can open the report and press Recheck; the registries are asked again, live.
  • Private: passages are never stored, only the identifiers, their positions and a hash. Metis never asks for conversation history.
  • Honest scope: Metis Check establishes that an identifier is registered and what the registry says. It does not decide whether a paper supports a claim.

Plans

Free: 5 checks a month. Pro: $29 a month (or $276 a year), 2,000 checks, case law included. Team: $249 a month (or $2,388 a year), 15,000 checks, 5 seats. Checks that cannot be settled cost nothing. Details: https://check-api.metisfoundry.com/check/plans

Repository layout

  • .agents/plugins/marketplace.json — Codex marketplace (metis); plugin in plugins/metis-check
  • .claude-plugin/marketplace.json — Claude Code marketplace (metis); plugin manifest in plugins/metis-check/.claude-plugin
  • server.json — official MCP Registry manifest
  • PUBLISH.md — how the listings are published

Support and license

hello@metisfoundry.com. The files in this repository are MIT licensed (LICENSE); the Metis Check service is proprietary (NOTICE.md).

Questions fréquentes

Qu'est-ce que Metis Check ?

Checks an answer's citations at the registries that issue them. Every check files a signed report.

Comment installer Metis Check ?

Il fonctionne comme serveur distant. Dans Claude Code : claude mcp add --transport http metis-check 'https://check-api.metisfoundry.com/mcp/check'. Pour les autres clients, collez la configuration JSON de cette page dans leurs réglages MCP.

Faut-il une clé API pour Metis Check ?

Son entrée au registre n'indique aucune clé ni secret obligatoire. Certaines fonctions peuvent tout de même demander un compte auprès du service auquel il se connecte.

Metis Check est-il open source ?

Son code est public sur GitHub, mais le dépôt ne déclare pas de licence standard.

Qui maintient Metis Check ?

Il est publié par MetisFoundry. AI.tn le référence sans le maintenir ni le recommander.

Issu du registre MCP officiel. Être listé n'est pas une recommandation : vérifiez le code et les permissions d'un serveur avant de lui donner accès à vos données.