anticipating-failure-modes

Systematically enumerate how code can fail to prevent claiming safety without evidence. Use when: (1) asked to identify failure modes, enumerate risks, or stress-test reliability assumptions, (2) code is characterized as safe or production-ready without enumerated failure scenarios, (3) a code review covers only successful execution paths, (4) changes are ready for approval without failure analysis, (5) code lacks input validation, error handling, or defensive checks, (6) test coverage includes only successful cases.