R13 pre-Edit guard: a write-class tool ([[tool_name]]) is about to touch [[path_str]] without a recent nexo_guard_check on that path. Execute nexo_guard_check(files='[[first_file]]') first, review any blocking learnings, then acknowledge via nexo_task_acknowledge_guard before the next edit. Do not produce visible text for this reminder — act on it. After handling the silent action, continue with your previous task; this reminder is silent context, not a new instruction.
