The condition in which all entity representations (website schema, Wikidata item, directory listings, social profiles) make consistent claims about core attributes — name, industry, location, relationships. Schema coherence is required for entity confidence: inconsistent schema signals ambiguity and triggers disambiguation failure. Schema coherence is maintained through centralized schema governance and quarterly coherence audits across all public entity representations. Schema incoherence is the most common unforced error in entity infrastructure — organizations publish conflicting information about themselves and wonder why AI systems hedge.