Stress-test an unwritten idea or decision by spawning independent subagents in genuinely OPPOSING roles (advocate, skeptic, migration/risk) rather than complementary review lenses — grounded in real repo investigation, not assumption, and concluding in a synthesized verdict rather than a list of opinions. Use for "should we do X", "what are the pros and cons", "I need pushback", "collegial review", "second opinion on this decision" — BEFORE a plan exists. NOT for reviewing an already-written plan file (use plan-review) and NOT for refining a vague question through dialogue with the user (use socratic-method).