Checks whether current web sources support a specific factual assertion. Takes a claim as a natural-language statement; returns a verdict with cited evidence and stated limits.
Verdict set:
- "supported" — multiple independent sources directly confirm the specific claimed detail
- "partially_supported" — sources confirm the entity and domain; specific detail is pointed to but not directly stated
- "insufficient_evidence" — sources don't address the specific claim; fires freely, including when the entity is well-known but the specific detail is undocumented
- "unsupported" — a credible source explicitly contradicts the claim
All verdicts are DECIDE-BY-EYE. A "supported" verdict means current web sources confirm it — not that it is true. Evidence may be incomplete, biased, or outdated. The stated_limits field is always present and identifies what the evidence cannot confirm.
Good input shape (specific, checkable assertions):
- "Werner Herzog dragged a full-size steamship over a hill during the filming of Fitzcarraldo"
- "Glenn Gould stopped giving live concerts in 1964"
- "The Backrooms photograph originated on 4chan"
Checks one specific factual statement. Not for identifying half-remembered works.
Not this shape:
- "there's a documentary about a filmmaker dragging a boat over a mountain"
- "a musician famous for stopping performing"