Interactive Prototype

Build a working clickable prototype — not a static mockup. Uses React + Babel inline with pinned versions, wrapped in a DeviceFrame.

Phase 0 — Context pre-flight (auto-detect, ONE question max)

Before design questions, silently check for context:

1. Read .claude/design-tokens.json if exists
2. Bash(ls ~/.claude/design-systems/ 2>/dev/null) — if brief mentions a brand matching a folder name → auto-apply
3. Glob for codebase tokens: **/tailwind.config.*, **/theme.{ts,js,json}, **/tokens.{css,scss}, **/_variables.*
4. Scan brief for: github URL → Skill: ingest-github; Figma URL → Skill: ingest-figma; image attachment → Skill: ingest-screenshot; .md/.pdf → Read

If nothing found, ask ONE AskUserQuestion: design system from registry / codebase / screenshot / Figma / none (use frontend-design) / Claude decides. Report "Using . Proceeding."

Phase 1 — Ambiguity gate

Check brief for: platform (iOS/Android/desktop/web), app category (food delivery, social, productivity, etc.), feature count, design context (brand/codebase).