Feature Rules

Outcome

Produce a feature inventory reproducible from information available at the declared prediction decision time T. Every feature needs its source, grain, availability rule, transform, lookback, shift, null policy, legality verdict, and evidence. Both raw inputs and every transformation must be legal at T.

When to Use This Skill

Use when:

• designing or reviewing predictors for a pre-event sports model;
• building rolling form, rest, matchup, rating, roster, injury, or context features;
• the user asks whether a column is legal at decision time T;
• turning EDA findings into a documented feature inventory.

Do not use this skill as a substitute for: