Shopping Agents Should Flag Unverified Claims Instead of Guessing

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A shopping agent reading a filament listing may see a diameter and colour but cannot confirm whether a spool fits a specific automatic feeder. Responding with a guess invents evidence, while refusing to say anything discards useful facts. The author proposes a claim-level, three-state policy, supported, contradicted, or unknown, applied to each specific claim rather than to the product as a whole. Missing evidence would restrict only the affected claim, so the rest of the product explanation remains available. The approach is illustrated with two filament listings from the author's own platform, WebAZ, and its scope is limited to listing content rather than material testing or print results.

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