A simple semantic layer a retrieval agent can call
An agent that answers questions about a company's numbers has to return a figure it was allowed to say, taken from a definition someone signed, and show where that figure came from. The failures are concrete when that constraint is missing. The model invents a metric name. It averages two rows because the question said "on average." It presents one breakdown as if it were a slice of another, because the words lined up.
A semantic layer is how those failures get closed. The term already covers four jobs. A metrics layer answers whether every tool computes revenue the same way. A catalog answers who owns a dataset, and whether this caller may see it. An ontology answers what a region is, and which other terms mean the same thing. A knowledge graph answers what an order is connected to. Product pages treat these as neighbors. An architecture review stacks...
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