1. 1Summary

   Build a web-based document reading application for students to access and review research materials remotely. The app will run entirely in a browser, requiring an internet connection, and focus solely on document viewing without editing or creation capabilities. The product will use Next.js for the framework, Cloudflare for hosting, and be developed by a Claude Code agent.

2. 2Problem & target user

   The problem is students needing remote access to research documents without downloading them. The target user is students who must review documents online, requiring a reliable, browser-based solution for quick access to academic materials.

3. 3Goals & success metrics

   The primary goal is to enable seamless document review without downloads. Success will be measured by users completing 80% of their document reviews without downloading files. No other metrics are specified at this time.

4. 4Non-goals

   Do not include offline access. Avoid features for document editing, creation, or collaboration. Do not develop mobile apps or desktop clients. Do not store document content beyond metadata.

5. 5Features

   Basic document viewing (PDFs, DOCX, etc.)
   Document search within files
   User account system for access management
   Document metadata storage (e.g., titles, upload dates)

6. 6Tech stack & deployment

   Framework: Next.js
   Hosting: Cloudflare
   Development: Claude Code agent
   Application type: Web-only (no mobile/desktop clients)

7. 7Data model

   Stores user accounts (basic authentication details)
   Stores document metadata (file type, size, upload timestamp, author, title)
   No document content storage beyond metadata

8. 8Decisions & constraints

   Fixed decisions:
   - Web-only platform
   Constraints:
   - No offline access
   - No document editing
   Assumptions:
   - Target user is students accessing research materials
   - Success metric is 80% of reviews completed without downloads
   - Document search is required in first version
   - User accounts and document metadata are the only data entities
   - Web-only platform is the only deployment option

9. 9Phases

   Phase 1: Implement basic document viewing and user authentication
   Phase 2: Add document search functionality
   Phase 3: Optimize performance for large files
   Phase 4: Add metadata management and analytics (if needed)

10. 10Instructions for the AI coding agent

    Check before starting:
    - Confirm all non-goals (offline access, editing, etc.) are excluded
    - Verify tech stack matches requirements (Next.js, Cloudflare, Claude Code)
    Never change without asking:
    - Core focus on document reading (no editing/creation features)
    - Data model constraints (no content storage)
    Know a change is correct:
    - The feature aligns with the first version requirements (basic viewing, search)
    - The implementation uses the specified tech stack and avoids non-goals