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(triggers: fmt.Errorf, errors.Is, errors.As, error wrapping, sentinel error, error handling)\"\n---\n\n# Golang Error Handling Standards\n\n## **Priority: P0 (CRITICAL)**\n\n## Principles\n\n- **Errors are Values**: Handle them like any other value.\n- **Handle Once**: Log OR Return. Never Log AND Return (creates duplicate logs).\n- **Add Context**: Don't just return `err` bubble up. Wrap it with context: `fmt.Errorf(\"failed to open file: %w\", err)`.\n- **Use Standard Lib**: Go 1.13+ `errors` package (`Is`, `As`, `Unwrap`) is sufficient. Avoid `pkg\u002Ferrors` (deprecated).\n\n## Guidelines\n\n- **Sentinel Errors**: Expoted, fixed errors (`io.EOF`, `sql.ErrNoRows`). Use `errors.Is(err, io.EOF)`.\n- **Error Types**: Structs implementing `error`. 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