# Simple Product Requirements Document: Chrome DevTools CLI Tool

## Problem Statement

### Problem Definition
The existing `counter-script.ts` provides comprehensive Chrome DevTools Protocol integration with 26 tools for browser automation and debugging, but lacks a user-friendly command-line interface for easy access and control. Users currently need to directly interact with the script programmatically, which limits accessibility and usability for common DevTools operations.

### Target Users
- Developers working on browser automation and testing
- QA engineers needing programmatic browser control
- DevOps engineers requiring automated browser operations
- End users who want to interact with Chrome DevTools operations through simple CLI commands

### Business Value
Creating a CLI wrapper (`cli.ts`) will significantly improve the usability of the Chrome DevTools script, enabling broader adoption and easier integration into development and testing workflows. This enhances productivity by providing standardized command-line access to browser automation, debugging, and performance monitoring operations.

## Solution Overview

### Solution Summary
Develop a new `cli.ts` file in the `src` directory that serves as a command-line interface controller for the existing `counter-script.ts` Chrome DevTools integration. The CLI will expose Chrome DevTools Protocol tools through intuitive commands, making browser automation and debugging functionality accessible via terminal operations.

### Key Features
1. Command-line argument parsing for Chrome DevTools operations
2. Integration with existing counter-script methods and tools
3. Help system and usage documentation
4. Error handling and validation
5. Support for all 26 Chrome DevTools operations across 6 categories (Navigation, Interaction, Debugging, Performance, Emulation, Network)

### User Flow
1. User installs/runs the CLI tool
2. User executes commands like `cli navigate --url https://example.com`, `cli screenshot --full-page`, etc.
3. CLI processes the command and interacts with counter-script
4. Results are displayed in the terminal
5. User can chain multiple operations or exit

## Core Requirements

### Must-Have Features
- CLI command structure for all Chrome DevTools operations
- Seamless integration with `counter-script.ts` methods and tools
- Command-line argument validation and parameter handling
- Clear error messages and help text
- Support for all 6 tool categories: Navigation, Interaction, Debugging, Performance, Emulation, Network
- Tool discovery and listing capabilities

### Technical Constraints
- Must be written in TypeScript
- Should follow existing project structure and conventions
- Compatible with Node.js runtime environment
- No breaking changes to existing `counter-script.ts`
- Must handle Chrome DevTools MCP server lifecycle properly

### Performance Goals
- CLI startup time under 500ms
- Command execution response time under appropriate timeouts (navigation: 30s, interactions: 10s, etc.)
- Memory usage appropriate for CLI tool (< 50MB)
- Support for headless browser operations by default

## Timeline & Success Metrics

### Major Milestones
1. **Week 1**: Requirements analysis, CLI design, and tool mapping
2. **Week 2**: Core CLI implementation and counter-script integration
3. **Week 3**: Testing across all tool categories, error handling, and documentation
4. **Week 4**: Final review, optimization, and deployment

### Success Metrics
- CLI successfully controls all 26 Chrome DevTools operations
- User acceptance testing passes with >95% satisfaction across all tool categories
- No performance regressions in counter-script functionality
- Documentation completeness score >90%
- Code coverage >85% for new CLI code
- All 6 tool categories (Navigation, Interaction, Debugging, Performance, Emulation, Network) fully supported

### Launch Criteria
- All 26 Chrome DevTools operations accessible via CLI
- Comprehensive error handling implemented for browser automation scenarios
- Help system functional and informative with tool categorization
- Integration tests pass for all tool categories
- Performance benchmarks met for different operation types
- Documentation complete and accurate with usage examples