AEO vs. SEO: What's Actually Different About Structured Data for AI Agents
If you've already invested in schema.org markup for Google, you might assume you're done. The gap that's left is smaller than starting from scratch — but it's a real gap, and it's usually completeness, not format.
It's a fair question: if schema.org/Product markup already exists for search engines, why would AI agents need anything different? The honest answer is that they mostly don't need a different format — they need the same format used more completely, and served somewhere they can find it reliably.
Where SEO structured data and AEO overlap
Both rely on the same core vocabulary: schema.org/Product, with fields for price, availability, brand, and — when present — additionalProperty entries for things like dimensions and material. A well-marked-up product page for Google Shopping is already speaking a language AI agents understand.
Where they diverge
- Completeness bar is higher. Google's Rich Results are lenient about partial markup — a product still shows up, just with fewer rich features. An AI agent deciding whether to recommend a product is far less forgiving of a blank dimensions field; it will often simply not mention the product at all.
- Freshness matters more, sooner. A search index refreshes on its own schedule. An agent answering a shopper's question right now needs current stock and price — which is why a live MCP tool call, not just a periodically-crawled feed, matters for commerce specifically.
- Discoverability needs an explicit signal. Search engines find pages through links and sitemaps built over years. Agents benefit from an explicit, low-friction map — an llms.txt file, a linked feed, an MCP endpoint advertised in your page's <head> — because they aren't crawling with the same patience or scale a search engine has.
- Natural-language ambiguity resolves differently. A human reading '"runs a bit small"' in a review infers a size adjustment. An agent, deciding whether to state a fact confidently, is more likely to treat that as noise it can't act on and fall back to whatever structured field exists — or recommend nothing.
The practical takeaway
Don't treat AEO as a separate initiative from your existing SEO structured-data work — treat it as the same work, finished. Audit for completeness on the handful of fields that matter most (dimensions, material, color, stock, return policy), and add an explicit, current, machine-readable path to that data that doesn't depend on an agent guessing where to look.