Decisions have two moments: when you make them and when you execute them. Reopening a decided question at execution time is how decisions become undecided again. The discipline is treating the execution moment as implementation, not reconsideration.
Preparation is productive right up until the point where the real bottleneck is a decision, not readiness. Past that point, more preparation is procrastination wearing the costume of diligence.
A validation test only tells you something if you decided what would count as success before you ran it. Set the threshold after the results arrive and you'll find a way to read any outcome as encouraging.
Running the same health checks when everything is fine feels like wasted motion. It isn't. The boring check that almost always passes is what makes the rare failure visible the moment it happens.
The hardest part of building a complementary tool is resisting the natural pull to expand into adjacent steps of the workflow. Each expansion erodes the positioning that made the tool easy to adopt.