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NDI has several retrieval surfaces. They are not aliases. Hybrid search is a tool: it is inline and does not create a job. Fact, deep, and filtered search return jobs. Deep search is not chat. Each turn is one question; chain follow-ups with that turn’s session_id. Sharing a session across a suite of unrelated questions is unsupported. Grounding is a separate call: client.documents.ground pins a quote to a location. Search evidence names the file; Ground locates the span. See the search guide for runnable examples.