App Builder - Application Building Orchestrator

Analyzes user's requests, determines tech stack, plans structure, and coordinates agents.

Selective Reading Rule

Read ONLY files relevant to the request! Check the content map, find what you need.

| File | Description | When to Read | |------|-------------|--------------| | project-detection.md | Keyword matrix, project type detection | Starting new project | | tech-stack.md | 2025 default stack, alternatives | Choosing technologies | | agent-coordination.md | Agent pipeline, execution order | Coordinating multi-agent work | | scaffolding.md | Directory structure, core files | Creating project structure | | feature-building.md | Feature analysis, error handling | Adding features to existing project | | templates/SKILL.md | Project templates | Scaffolding new project |

Question Tool Usage (MANDATORY)

When this skill requires user input or choices:

Use question tool for all multi-option scenarios
Present trade-offs clearly in option descriptions
Structure template selection questions properly

Example usage:

question({
  questions: [{
      question: "Which application template?",
      header: "Template",
      options: [
        { label: "Next.js Full-Stack", description: "Modern React stack" },
        { label: "FastAPI", description: "Python API" },
        { label: "React Native", description: "Mobile app" }
      ]
    }]
})

See .opencode/rules/MASTER.md for complete Question Tool Protocol.

Templates (13)

Quick-start scaffolding for new projects. Read the matching template only!

| Template | Tech Stack | When to Use | |----------|------------|-------------| | nextjs-fullstack | Next.js + Prisma | Full-stack web app | | nextjs-saas | Next.js + Stripe | SaaS product | | nextjs-static | Next.js + Framer | Landing page | | nuxt-app | Nuxt 3 + Pinia | Vue full-stack app | | express-api | Express + JWT | REST API | | python-fastapi | FastAPI | Python API | | react-native-app | Expo + Zustand | Mobile app | | flutter-app | Flutter + Riverpod | Cross-platform mobile | | electron-desktop | Electron + React | Desktop app | | chrome-extension | Chrome MV3 | Browser extension | | cli-tool | Node.js + Commander | CLI app | | monorepo-turborepo | Turborepo + pnpm | Monorepo |

Related Agents

| Agent | Role | |-------|------| | project-planner | Task breakdown, dependency graph | | frontend-specialist | UI components, pages | | backend-specialist | API, business logic | | database-architect | Schema, migrations | | devops-engineer | Deployment, preview |

Usage Example

User: "Make an Instagram clone with photo sharing and likes"

App Builder Process:
1. Project type: Social Media App
2. Tech stack: Next.js + Prisma + Cloudinary + Clerk
3. Create plan:
   ├─ Database schema (users, posts, likes, follows)
   ├─ API routes (12 endpoints)
   ├─ Pages (feed, profile, upload)
   └─ Components (PostCard, Feed, LikeButton)
4. Coordinate agents
5. Report progress
6. Start preview