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Orchestration
Coordinating several models, tools and steps into one piece of work.
Individual model calls are cheap and reliable. Chains of them are neither, because errors compound and a step that works 95% of the time works 60% of the time when you do it ten times in a row. Orchestration is the plumbing, and most of the engineering difficulty in real deployments is here rather than in the model.
Why it matters
Demos are single steps. Operations are chains.