Use when about to do focused reads of unfamiliar implementation files, or when you need a factual answer about files (subsystem map, smallest focused read list, symbol/line anchors, API or flow map, config/docs detail) without pulling large file contents into the main context. Read planning and read-only codebase scouting. Not for code review, bug finding, correctness judgments, edit strategies, or implementation planning.
2026-06-19