Adaptive thinking partner that helps clarify, challenge, and refine ideas through persistent questioning. Auto-detects domain (product, architecture, debugging, process, general) and user mode (exploring, deciding, refining) to adapt question style. Actively pushes back on weak reasoning — flags contradictions, challenges assumptions, stress-tests claims. Produces context-appropriate artifacts when done (design doc, hypothesis list, decision matrix, or key insights). Use this skill when: (1) brainstorming or exploring an idea before implementation, (2) requirements are vague and need clarification, (3) making architectural or product decisions, (4) debugging and need to form hypotheses, (5) refining an approach that's mostly decided. Triggers on: 'brainstorm', 'clarify', 'think through', 'explore', 'help me figure out', 'what should I consider', 'let's think about', 'what could go wrong', 'help me decide'.