The model is the same for everyone. The context is the only part that is yours.

Every enterprise can buy the same model. None of them can buy your context. What the agent knows about your business — which figures are authoritative, what a term means here, which customer this is, what this person is entitled to see, and why any of it should be believed — is assembled, not given. That assembly is a supply chain with sources, transformations, quality, ownership and provenance, and it fails in specific ways: missing, stale, wrong, forbidden, poisoned, or simply crowded out. This guide walks the whole chain — the budget, the instruction layers, retrieval and what it costs in time and money, grounding, the semantic layer, entitlements, systems of record, unstructured and multilingual material, memory, compaction, quality, the reviewer's loop, lineage and residency, and multi-agent hand-offs — and ends on how all of it fails. Five lenses per concept: what it requires, how to architect it for a bank, a flow diagram, a plain-English reading, and what it hands off next.