Verification principle. Verify against the real artifact, not a proxy, a self-report, or “it compiles”.
Applies after completing a task, before declaring done. pstack’s member of the pattern-evidence-before-claims cluster alongside sp-verification-before-completion. Its sharpest operational form is the evidence ladder in pstack-blast-radius, which grades a safety claim from “you said so” up to “you reproduced it in the running app” and requires you to say where it stopped.
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.