Worked on improving documentation and technical clarity for the external scanner component in the tree-sitter/tree-sitter repository. Focused on addressing a documentation gap related to the advance function’s skip parameter, clarifying its correct usage to prevent incorrect token ranges during lexer operations. Used Markdown and technical writing skills to detail the interaction between skip and mark_end, reducing potential confusion for downstream developers. The work enhanced the reliability and maintainability of the external scanner integration by explicitly documenting C-level API semantics, ultimately minimizing lexer and tokenization errors that could arise from misinterpretation of the advance function’s behavior in tree-sitter’s parsing workflow.