Worked on the google/oss-fuzz-gen repository to enhance the robustness of the DefaultTemplateBuilder by addressing error handling issues in Python. Focused on ensuring that error descriptions and error lists are properly initialized even when empty or set to None, which eliminated unnecessary warnings during fixer prompt generation. This targeted code refactoring preserved detailed build error messages, thereby improving the reliability and clarity of prompts used in the fixer workflow. The work demonstrated careful attention to error handling and prompt engineering, resulting in a more maintainable and auditable codebase. Delivered a focused bug fix that improved the overall stability of the project.