Citation Check is a remote MCP server that gives an AI agent 2 tools, among them check_citation, verdict_meanings. It answers at https://exmachina-ai.fly.dev/verify over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 6 of 6 times since 11 September 2026; the last check, on 20 October 2026, succeeded.
Does a cited URL exist, and does the source name what your claim names? Two answers.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
check_citation | Fetch a URL and report whether it exists, and whether the source names the same entity as the claim you attach to it. These are two different questions and conflating them is the failure this exists to catch: a URL can return 200 and descri Inputs: url, claim |
verdict_meanings | The exact semantics of every status and relevance value, including what this checker cannot determine. Read once before trusting a verdict. |
Every block below points at https://exmachina-ai.fly.dev/verify. Pick your client and copy.
claude mcp add --transport http citation-check https://exmachina-ai.fly.dev/verify
{
"mcpServers": {
"citation-check": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://exmachina-ai.fly.dev/verify"]
}
}
}{
"mcpServers": {
"citation-check": {
"url": "https://exmachina-ai.fly.dev/verify"
}
}
}{
"servers": {
"citation-check": {
"type": "http",
"url": "https://exmachina-ai.fly.dev/verify"
}
}
}{
"context_servers": {
"citation-check": {
"url": "https://exmachina-ai.fly.dev/verify"
}
}
}{
"mcpServers": {
"citation-check": {
"serverUrl": "https://exmachina-ai.fly.dev/verify"
}
}
}{
"mcpServers": {
"citation-check": {
"url": "https://exmachina-ai.fly.dev/verify"
}
}
}name: Citation Check
version: 0.0.1
schema: v1
mcpServers:
- name: Citation Check
type: streamable-http
url: https://exmachina-ai.fly.dev/verify{
"mcpServers": {
"citation-check": {
"httpUrl": "https://exmachina-ai.fly.dev/verify"
}
}
}{
"mcpServers": {
"citation-check": {
"type": "http",
"url": "https://exmachina-ai.fly.dev/verify"
}
}
}{
"mcpServers": {
"citation-check": {
"url": "https://exmachina-ai.fly.dev/verify"
}
}
}goose://extension?url=https%3A%2F%2Fexmachina-ai.fly.dev%2Fverify&type=streamable_http&id=citation-check&name=Citation%20Check
It answered our last check on 20 October 2026 in 229 ms. Over 6 checks since 11 September 2026 it answered 6. Status here comes from Neuronto's own probes, not from the publisher.
2, as returned by the server's own tools/list on 12 September 2026: check_citation, verdict_meanings.
It answered our last check on 20 October 2026 in 229 ms. Over 6 checks since 11 September 2026 it answered 6.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://exmachina-ai.fly.dev/verify. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: io.github.secondstageturbine. Endpoint host: exmachina-ai.fly.dev. ARD identifier: urn:air:io.github.secondstageturbine:mcp:citation-check.
First indexed 10 September 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.