Verification principle. Trace each symptom to its root cause and fix it there.
Applies when debugging: reproduce first, ask why until you reach it, resist nil-check guards that silence crashes. pstack’s member of the debugging cluster with gstack-investigate, sp-systematic-debugging, mp-diagnosing-bugs, addy-debugging, and ce-debug. pstack-no-comments cites it as intent-only authority — it guides the fix but never licenses widening the fence.
See Also
- pstack-poteto-mode — indexes this principle inline and reads the index at task start.
- pstack — the twenty-three-principle set this belongs to.