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description: Interactive design refinement using Socratic method with AskUserQuestion tool
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Use and follow the brainstorm skill exactly as written

**🚨 CRITICAL REQUIREMENTS**:

1. **Write plan file FIRST**: Create `.claude/docs/plans/<topic>-design.md` BEFORE asking questions, then update it incrementally after EACH answer. Do NOT wait until the end.
2. **Use AskUserQuestion tool for ALL questions**: NEVER output questions as plain text - always use the tool to enable interactive selection.