Safety rules, workflows, and tool reference for debugging applications via IntelliJ debugger: breakpoints, debug sessions, stepping, evaluating expressions, inspecting runtime state. TRIGGER when: user wants to debug, investigate a bug, set breakpoints, inspect runtime behavior, step through code, or understand why code behaves unexpectedly at runtime. Trigger phrases (EN): "debug", "breakpoint", "step through", "step into", "step over", "why does this crash", "why is this null", "launch in debug mode", "trace execution", "run with debugger", "evaluate expression". Trigger phrases (RU): "отладить", "дебаг", "брейкпоинт", "почему падает", "пошагово пройти", "зайти в метод", "посмотреть значение переменной", "запустить в режиме отладки", "почему null", "стектрейс". Also trigger when user wants to understand runtime behavior or investigate incorrect behavior.