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This skill provides specialized guidance for implementing comprehensive error handling across application layers, from controllers and services to external API integrations. It enables the creation of custom exception types, facilitates fail-fast validation, and ensures proper resource cleanup while preventing the clutter of scattered try-catch blocks. By following these standards, developers can provide user-friendly error messages without exposing sensitive technical details, implement sophisticated retry strategies for external services, and maintain consistent error logging practices across the entire codebase.