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Feature Documentation Guide

Feature Documentation Template

When documenting a feature or product, follow this structure to ensure comprehensive and AI-friendly documentation.

1. Feature Overview

Provide a clear description of what the feature does and its purpose within the product ecosystem.

Example:

# Calendar Scheduling Feature


The Calendar Scheduling feature allows users to create, manage, and share availability slots for booking appointments. It integrates with popular calendar services (Google Calendar, Outlook) and provides automated notifications for all participants.

2. User Journey

Document the user flow with step-by-step instructions and visual aids when possible.

Example:

## User Flow


1. User navigates to Calendar section in the left sidebar
2. User clicks "Create Availability" button
3. User selects days and time ranges for their availability
4. User configures booking settings (duration, buffer time, etc.)
5. User publishes the availability slot and receives a shareable link
6. Clients use the link to book available time slots


[Video Tutorial Link](https://loom.com/share/example123)


![User Flow Diagram](path/to/diagram.png)

3. Technical Documentation

3.1 Repository Information

Provide links to relevant code repositories.

Example:

### Repository


- Frontend: [github.com/organization/calendar-frontend](https://github.com/organization/calendar-frontend)
- Backend: [github.com/organization/calendar-api](https://github.com/organization/calendar-api)

3.2 Frontend Implementation

Document frontend architecture, frameworks, and deployment process.

Example:

### Frontend Implementation


- **Architecture**: Micro-frontend using Module Federation
- **Framework**: React 18 with TypeScript
- **State Management**: Redux Toolkit
- **Deployment**:
  - Hosting: Firebase Hosting
  - CI/CD: [Jenkins Pipeline](https://jenkins.example.com/job/calendar-frontend)
  - Staging Deployment Process:
    1. Merge PR to `staging` branch
    2. Jenkins automatically builds and deploys to staging environment
    3. Access staging at [calendar-staging.example.com](https://calendar-staging.example.com)

3.3 Backend Implementation

Document APIs, servers, and other backend components.

Example:

### Backend Implementation


- **Service Type**: RESTful API
- **Framework**: NestJS with TypeScript
- **Database**: MongoDB with the following collections:
  - `availabilities`: Stores user availability settings
  - `bookings`: Stores actual booked appointments
  - `notifications`: Stores notification templates and logs


#### Key APIs:
- `GET /api/calendar/slots`: Retrieves available time slots
- `POST /api/calendar/book`: Books a specific time slot
- `PUT /api/calendar/settings`: Updates calendar settings


Complete API documentation available in [API Guide](link-to-api-docs)

3.4 Technical Architecture

Provide a high-level overview of the feature’s architecture.

Example:

### Technical Architecture


The Calendar feature follows a microservice architecture:


1. Calendar Frontend (React) communicates with Calendar API
2. Calendar API interacts with:
   - Database for storing availability and bookings
   - Notification Service for sending emails/SMS
   - External Calendar APIs (Google, Outlook) for synchronization


![Architecture Diagram](path/to/architecture-diagram.png)

3.5 Testing Information

Document testing procedures and key test cases.

Example:

### Testing


#### Basic Test Cases
- Creating availability slots with various time configurations
- Booking slots as an end-user
- Canceling and rescheduling appointments
- Calendar synchronization with external providers


#### Automated Tests
- Unit tests: `src/tests/calendar/*.test.ts`
- Integration tests: `cypress/integration/calendar/*.spec.ts`
- E2E test command: `npm run test:e2e:calendar`

3.6 Edge Cases

Document known edge cases and their handling.

Example:

### Edge Cases


- **Timezone Handling**: System converts all times to UTC in database but displays in user's local timezone
- **Daylight Savings**: Appointments during daylight savings changes are flagged with warnings
- **Concurrent Bookings**: Locking mechanism prevents double-booking through the API
- **Calendar Sync Failures**: Automatic retry mechanism with exponential backoff

3.7 Advanced Use Cases

Document advanced or unexpected usage patterns discovered from users.

Example:

### Advanced Use Cases


- **Group Scheduling**: Users create shared team availability by linking multiple calendars
- **Conditional Availability**: Users set up rules to only show availability if certain conditions are met
- **API Integration**: Third-party services use our calendar API for their own scheduling tools

3.8 Technical Limitations

Document current limitations of the feature.

Example:

### Technical Limitations


- Maximum of 100 concurrent bookings per account
- Calendar sync runs every 5 minutes (not real-time)
- Video conferencing integration limited to Zoom and Google Meet
- No support for recurring appointments with varying durations

3.9 Future Improvements

List planned improvements and technical debt items.

Example:

### Future Improvements


- Real-time calendar synchronization
- Support for additional video conferencing providers
- Improved analytics dashboard for booking statistics
- Mobile app implementation


Related tasks:
- [TASK-789](https://clickup.com/t/789abc): Implement WebSocket for real-time updates
- [TASK-456](https://clickup.com/t/456def): Add Microsoft Teams integration

3.10 Impact Areas

Document other systems or features that may be affected by changes to this feature.

Example:

### Impact Areas


Changes to this feature may affect:
- Notification system (for booking confirmations)
- User profile system (for calendar preferences)
- Billing system (for paid appointment features)
- Analytics dashboard (for booking statistics)

4. Change Log

Maintain a chronological record of significant changes.

Example:

## Change Log


### 2023-11-24


**PR**: [#567](https://github.com/organization/repo/pull/567)
**Task**: [TASK-123](https://clickup.com/t/123abc)
**Slack Thread**: [Link to discussion](https://organization.slack.com/archives/C123456/p123456)


**Changes**:
- Added support for Google Calendar integration
- Improved timezone handling
- Fixed booking confirmation email template

Best Practices

  1. Be Comprehensive: Include all relevant information without assuming prior knowledge
  2. Use Concrete Examples: Provide real examples rather than abstract placeholders
  3. Include Visual Aids: Add screenshots, diagrams, and videos where helpful
  4. Keep Updated: Update documentation when the feature changes
  5. Link Related Documentation: Reference related APIs, services, or features