A team is choosing a multi-agent pattern for a strategic-recommendation system that produces market-entry advice. They're weighing three patterns: Pipeline (Researcher → Analyst → Editor, sequential), Debate (two analysts argue from opposing premises, a judge synthesizes), and Orchestrator (a coordinator dynamically dispatches to specialized subagents based on the question).
When does Debate beat Pipeline or Orchestrator?
Why did you pick that answer? Two or three sentences. The act of articulating it is what builds the judgment — not the click that follows.
Debate is the right multi-agent pattern when adversarial scrutiny improves judgment quality. A market-entry recommendation involves contested premises — the case for expansion and the case for caution rest on different assumptions. Pipeline can produce a coherent recommendation but tends to lock in early framing. Orchestrator can decompose dynamically but doesn't systematically surface opposing views. Debate is built for the adversarial case: each side argues their best case, the judge synthesizes. Use it for recommendations with contested premises, not for everything.
Debate adds latency, cost, and complexity. For tasks without contested premises (categorize this expense, route this ticket), debate is wasteful overhead. Match the pattern to the task.
This is the genuinely tempting wrong answer because both Debate and multi-perspective generation produce multiple voices in conversation — and they look similar from outside. But they're doing different work. Multi-stakeholder roleplay enumerates complementary perspectives (each stakeholder's legitimate concerns); Debate enacts adversarial scrutiny on a single recommendation (the strongest case for, the strongest case against). Conflating them produces a Debate setup that surfaces stakeholder concerns without ever pressure-testing the recommendation — which is what you needed Debate for in the first place.
"One well-prompted analyst can produce the same answer" is true for many tasks and false for the contested-premise ones. Debate isn't about producing the same answer twice — it's about producing an answer that has survived the strongest counter-argument.