# Product Requirements Document

## Product overview

### Name
**[Product name]** - [Subtitle]

### Product concept
- **[Concept 1]**: [Description]
- **[Concept 2]**: [Description]
- **[Concept 3]**: [Description]

### Product vision
[Describe the world this product aims for, in 3-5 sentences]

### Purpose
- [Purpose 1]
- [Purpose 2]
- [Purpose 3]

## Target users

### Primary persona: [Name] ([Age], [Occupation])
- [Attribute 1: e.g., freelancer running 3-5 projects in parallel]
- [Attribute 2: e.g., Vim/Emacs + terminal environment]
- [Current problem: e.g., does not want to spend time on task management]
- [Expected solution]
- [A typical daily workflow]

## Success metrics (KPIs)

### Primary KPIs
- [Metric 1]: [Target value] ([Deadline])
  - Example: Daily active users (DAU): 100 (in 3 months)
- [Metric 2]: [Target value] ([Deadline])
  - Example: Task completion rate: 70% or higher

### Secondary KPIs
- [Metric 1]: [Target value] ([Deadline])
- [Metric 2]: [Target value] ([Deadline])

## Functional requirements

### Core features (MVP)

#### [Feature 1]

**User story**:
As a [user], I want [feature] so that [goal]

**Acceptance criteria**:
- [ ] [Criterion 1: described in a measurable form]
- [ ] [Criterion 2: described in a measurable form]
- [ ] [Criterion 3: described in a measurable form]

**Priority**: P0 (Required)

#### [Feature 2]

**User story**:
[Description]

**Acceptance criteria**:
- [ ] [Criterion 1]
- [ ] [Criterion 2]

**Priority**: P1 (Important)

### CLI interface (if applicable)

```bash
# Example of basic operations
[command] [subcommand] [options]
# Write specific command examples
```

### Future features (Post-MVP)

#### [Feature 3]

[Brief description]

**Priority**: P2 (Nice to have)

## Non-functional requirements

### Performance
- [Requirement 1]: [Measurable standard]
  - Example: Command execution time: within 100ms
- [Requirement 2]: [Measurable standard]
  - Example: Task list display: within 1 second for up to 1000 items

### Usability
- [Requirement 1]: [Measurable standard]
  - Example: A new user can learn the basic operations within 5 minutes
- [Requirement 2]: [Measurable standard]

### Reliability
- [Requirement 1]: [Measurable standard]
  - Example: Zero data loss (automatic backup)
- [Requirement 2]: [Measurable standard]

### Security
- [Requirement 1]: [Measurable standard]
- [Requirement 2]: [Measurable standard]

### Scalability
- [Requirement 1]: [Measurable standard]
- [Requirement 2]: [Measurable standard]

## Out of scope

Items explicitly considered out of scope:
- [Item 1]
- [Item 2]
- [Item 3]