James Risberg developed AST-aware code chunking for the tobi/qmd repository, leveraging tree-sitter to segment code at function, class, and import boundaries while maintaining backward compatibility with previous chunking logic. He migrated the existing AST chunking tests to the Vitest framework, improving integration testing and streamlining the test suite by removing outdated benchmarks. Working primarily with TypeScript, Go, and JavaScript, James focused on enhancing parsing accuracy and test coverage. His contributions enabled more reliable continuous integration and faster iteration on code understanding features, reflecting a thoughtful approach to both core functionality and the supporting test infrastructure within the project.