# schema_driven_validation > Validation rules must be derived from the active workflow schema only. - Author: moheban - Repository: moheban/codexskills - Version: 20251229093152 - Stars: 0 - Forks: 0 - Last Updated: 2026-02-06 - Source: https://github.com/moheban/codexskills - Web: https://mule.run/skillshub/@@moheban/codexskills~schema_driven_validation:20251229093152 --- # Skill: Schema-Driven Validation Validation rules must be derived from the active workflow schema only. Authoritative sources for validation: - The active workflow specification - The active input guide for that workflow - Explicit per-workflow include and extra key lists Global field metadata alone is not sufficient to require a value. Fields outside the active workflow schema must never trigger required-field errors.