Worked on improving the reliability of help text rendering and error reporting in the fastapi/typer repository. Addressed a regression by ensuring that rich.markup is properly imported whenever help text is rendered, which resolved errors that could disrupt the command-line interface experience. Added a targeted regression test to cover the import path, preventing similar issues in the future. Refactored the traceback generation logic to guarantee all necessary imports are available during error reporting, enhancing the stability of CLI applications built with Typer. Utilized Python, CLI development, and testing skills to deliver more robust error handling and maintainable code.