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A lot of AI agents identify things the same way: search Wikidata for the name, take the first result, move on. It is one line of code and it usually works. We measured how often it does not, and what happens when it fails.

Every entity linking service answers the same question: which real-world thing does this name refer to? They differ in what they return, what they do when unsure, and whether they can use your own knowledge graph. This page compares six options on