# Requirements: Chat Agent WebApp

**Defined:** 2026-03-27
**Core Value:** A working, well-understood AI chat interface — every line of code is intentional and explained

## v1 Requirements

### Chat Core

- [ ] **CHAT-01**: User can type a message and send it to the OpenAI GPT API
- [ ] **CHAT-02**: User receives the AI response displayed in the chat area

### Conversation Management

- [ ] **CONV-01**: User can create a new conversation
- [ ] **CONV-02**: User can switch between existing conversations
- [ ] **CONV-03**: User can delete a conversation
- [ ] **CONV-04**: Conversations persist to JSON files and survive app restarts

### Message Display

- [ ] **DISP-01**: AI responses render as formatted markdown (headings, lists, bold, links)
- [ ] **DISP-02**: Code blocks in AI responses display with syntax highlighting
- [ ] **DISP-03**: User can copy a message to clipboard

### UI/Layout

- [ ] **UI-01**: App has sidebar with conversation list and main chat area
- [ ] **UI-02**: Chat area has text input with send button
- [ ] **UI-03**: App layout is responsive across screen sizes

### Code Quality

- [ ] **CODE-01**: Every Blazor concept introduced has inline comments explaining what and why
- [x] **CODE-02**: Each phase introduces one concept incrementally (tutorial-style progression)

## v2 Requirements

### Streaming

- **STRM-01**: AI responses stream token-by-token in real time
- **STRM-02**: User can cancel an in-progress AI response
- **STRM-03**: Loading/typing indicator shows during AI generation

### Agentic Workflows

- **AGNT-01**: LangChain integration for workflow orchestration
- **AGNT-02**: RAG pipeline for document retrieval
- **AGNT-03**: MCP server integration for tool use

### Enhanced Features

- **ENH-01**: Auto-generated conversation titles from first message
- **ENH-02**: System prompt configuration per conversation
- **ENH-03**: Model selector (GPT-4o, GPT-4o-mini, etc.)
- **ENH-04**: Dark/light theme toggle
- **ENH-05**: Auto-scroll during message display
- **ENH-06**: Visual distinction between user and AI messages (styled bubbles)

## Out of Scope

| Feature | Reason |
|---------|--------|
| Authentication/login | Single user, no auth needed |
| Database storage | JSON files sufficient for personal use |
| Deployment/hosting | Local development only for v1 |
| Multi-user support | Personal tool |
| OAuth/third-party login | Not needed |
| Voice input/output | Complexity, not core to chat value |
| Image/multimodal input | Defer to v2+ |
| Real-time collaboration | Single user |
| Mobile app | Web-first |

## Traceability

Which phases cover which requirements. Updated during roadmap creation.

| Requirement | Phase | Status |
|-------------|-------|--------|
| CHAT-01 | Phase 3 | Pending |
| CHAT-02 | Phase 3 | Pending |
| CONV-01 | Phase 2 | Pending |
| CONV-02 | Phase 2 | Pending |
| CONV-03 | Phase 2 | Pending |
| CONV-04 | Phase 2 | Pending |
| DISP-01 | Phase 4 | Pending |
| DISP-02 | Phase 4 | Pending |
| DISP-03 | Phase 4 | Pending |
| UI-01 | Phase 5 | Pending |
| UI-02 | Phase 5 | Pending |
| UI-03 | Phase 5 | Pending |
| CODE-01 | Phase 1 | Pending |
| CODE-02 | Phase 1 | Complete |

**Coverage:**
- v1 requirements: 14 total
- Mapped to phases: 14
- Unmapped: 0 ✓

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*Requirements defined: 2026-03-27*
*Last updated: 2026-03-27 after roadmap creation — all 14 requirements mapped*