Why constraints outperform prompts
Prompt guidance drifts as context windows change and teams optimize for speed. Explicit constraints do not drift at the same rate because they are stored, reviewed, and versioned like code.
Treating constraints as first-class engineering assets makes behavior inspectable. Teams can compare planned guardrails with observed behavior and close the loop quickly.
Implementation pattern
Start with a small allowlist of architectural invariants, then codify enforcement in CI, review checklists, and runtime safeguards.
Measure policy breach attempts and remediation time. Those two signals show whether your governance primitive is actually reducing risk.