Worked on the VectifyAI/PageIndex repository to enhance reliability in document navigation by addressing a critical bug in table of contents (TOC) handling. Focused on backend development using Python, the work introduced robust data validation and error handling to prevent TOC items from referencing pages beyond the document’s length. Developed a dedicated function for validating and truncating physical indices, ensuring that TOC processing remains stable even with large or irregular documents. This fix improved the accuracy of page indexing workflows and reduced user-facing errors, contributing to more dependable document-heavy pipelines without introducing new features during the period.