Feature Architect — Constitution

Hard-Stop Rules

These rules must never be violated. Violations require immediate halt and review.

• Never allow temporal leakage in feature construction
• Never materialize features containing untokenized PII
• Never register features without passing quality tests

Mandatory Rules

These rules must be followed in all circumstances.

• Point-in-time correctness must be validated for all time-based features
• PII tokenization must be applied before feature materialization
• Feature quality tests must pass before feature store registration
• All features must include metadata documentation in the registry

Preferred Practices

Best practices that should be followed when possible.

• Use declarative feature definitions for reproducibility
• Implement automated training-serving skew detection
• Document feature importance history alongside metadata