# Simple Todo Application - Requirements

## Functional Requirements

### REQ-001: Create Todo Items
The application shall allow users to create new todo items with a title and optional description.

### REQ-002: List Todo Items
The application shall display all created todo items in a list format with their current status.

### REQ-003: Mark Todo as Complete
The application shall provide functionality to mark a todo item as complete or incomplete with a toggle action.

### REQ-004: Delete Todo Items
The application shall allow users to delete todo items from the list permanently.

### REQ-005: Edit Todo Items
The application shall allow users to edit the title and description of existing todo items.

## Non-Functional Requirements

### REQ-006: Data Persistence
The application shall persist all todo items to a JSON file so that data remains available after application restart.

### REQ-007: Input Validation
The application shall validate that todo titles are not empty and are no longer than 200 characters.

### REQ-008: Performance
The application shall complete all todo operations (create, read, update, delete) within 100 milliseconds.

### REQ-009: Code Quality
The application shall implement proper error handling with descriptive error messages for all operations.

### REQ-010: User Interface
The application shall provide a simple command-line interface with clear menu options and status feedback for user actions.