Teams Optimize Last-Updated Signals For LLM Trust

The article advises teams to treat “last updated” as a core trust signal for large language models, explaining how freshness influences inclusion in AI Overviews, assistants, and RAG workflows. It presents a taxonomy of signals—document, site, technical, behavioral, and retrieval-level—and recommends machine-readable dates, clean sitemaps, HTTP headers, changelogs, versioning, and sync cadence to ensure updates propagate into generative answers.