Server data from the Official MCP Registry
Checks an answer's citations at the registries that issue them. Every check files a signed report.
About
Checks an answer's citations at the registries that issue them. Every check files a signed report.
Remote endpoints: streamable-http: https://check-api.metisfoundry.com/mcp/check
Security Report
Valid MCP server (1 strong, 0 medium validity signals). No known CVEs in dependencies. Imported from the Official MCP Registry.
Endpoint verified · Requires authentication · 1 issue found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Found in Source Code
Found by scanning the linked source code. This listing connects to a hosted endpoint, so none of this runs on your machine: it describes what the server software does where it is hosted.
How to Connect
Remote Plugin
No local installation needed. Your AI client connects to the remote endpoint directly.
Add this to your MCP configuration to connect:
{
"mcpServers": {
"com-metisfoundry-check-api-metis-check": {
"url": "https://check-api.metisfoundry.com/mcp/check"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
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
| Client | How |
|---|---|
| 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 CLI | codex plugin marketplace add MetisFoundry/metis-plugins then codex plugin add metis-check@metis |
| ChatGPT | The 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 |
| Cursor | Add to Cursor |
| VS Code | Add to VS Code (web redirect), or code --add-mcp '{"name": "metis-check", "type": "http", "url": "https://check-api.metisfoundry.com/mcp/check"}' |
| Any MCP client | Remote 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 inplugins/metis-check.claude-plugin/marketplace.json— Claude Code marketplace (metis); plugin manifest inplugins/metis-check/.claude-pluginplugins/metis-check/.codex-plugin/plugin.json— Codex plugin manifest (iconassets/icon-codex.png)server.json— official MCP Registry manifestPUBLISH.md— how the listings are published
Support and license
hello@metisfoundry.com. Proprietary: the files in this repository are not open source. You may install and use them, unmodified, with the Metis Check service, and plugin directories may mirror the unmodified plugin bundle so users can install it (LICENSE, NOTICE.md).
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