Most infrastructure tooling answers did the API accept the call. That question can come back clean while the thing you care about is broken. These are findings from asking the other question — and every one was measured against a live system with a control that could tell a real result from a broken instrument.
- create-stack exits 0 when your guardrail rejects the stack CloudFormation has two kinds of parameter validation. One fails your CLI immediately; the other returns success and rolls the stack back. I learned the difference by nearly publishing the opposite.