The tools that change a file, in Claude Code’s vocabulary. One list for
the monitor’s files_modified, the session focus (#596), the brain’s
edit-outcome attribution and role suggestion, so a renamed tool is found
in one place.
The last cap bytes of a transcript, lossily decoded. Recent lines carry
the strongest “what is this session doing now” signal, and a bounded
read keeps a multi-hundred-MB transcript off the hot path. The first
line of the window is usually cut and fails to parse; callers skip it.