Be cautious about what data gets included in log messages to prevent security risks and performance issues. Before logging file contents or user data, consider whether it could contain: - Binary data (images, PDFs, executables) - Personally identifiable information (PII) - Extremely large content that could overwhelm logs or consume excessive memory - Sensitive configuration or authentication data Instead of logging full content, log metadata like file names, sizes, types, or character counts. Use appropriate log levels - consolidate related error information into a single error log rather than splitting across multiple log statements. Example of what to avoid: ```python # Bad - logs potentially sensitive/large content file_content = file_system.read_file(file_name) logger.info(f'Read file contents: {file_content}') # Bad - splits error information logger.info("error during llm invocation") logger.error(e) ``` Example of better approach: ```python # Good - logs metadata only file_content = file_system.read_file(file_name) logger.info(f'Read file {file_name} ({len(file_content)} characters)') # Good - consolidated error logging logger.error(f"Error during LLM invocation: {e}") ```