During October 2025, Carlos Varela Rosa enhanced the undertale-re/undertale repository by refactoring the instruction tokenizer to improve parsing accuracy for zero-operand instructions and instruction prefixes. Using Python and leveraging skills in assembly language and tokenization, Carlos reworked the pretokenization logic to ensure instructions like 'ret' and various prefixes were correctly recognized, enabling more reliable code analysis and disassembly. Alongside these technical improvements, Carlos updated the project’s documentation in reStructuredText, correcting typographical errors to improve clarity and professionalism. The disciplined approach, including clear commit messages, contributed to maintainable code and streamlined future reviews for the project.