Prove It Works
Trigger
When verifying changes, completing tasks, or claiming something is fixed.
Rule
Verify the requested behavior against the real artifact or surface whenever possible; a proxy check only proves the proxy.
Application
- Name the concrete decision this principle changes.
- Apply the rule to that decision, not as a decorative citation.
- Prefer evidence from the current repository/runtime over generic preference.
- If the principle conflicts with an explicit user constraint, keep the constraint and state the tradeoff.