# Data Quality Rules

> See the main Data Validation Rules skill for comprehensive coverage of data quality rule implementation.

- Skill: `majiayu000/data-quality-rules-2` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/data-quality-rules-2`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/data-quality-rules-2/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/data-quality-rules-2

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# Data Quality Rules

This skill is covered in detail in the main **Data Validation Rules** skill.

Please refer to: `43-data-reliability/data-validation-rules/SKILL.md`

That skill covers:
- Levels of data validation (database, application, pipeline, API)
- Common validation patterns (required fields, type, format, range, enum, cross-field, conditional)
- Validation libraries (Pydantic, Zod, JSON Schema, Marshmallow, Cerberus, Joi, Yup)
- Database-level validation (CHECK constraints, triggers, domain types)
- API validation (FastAPI, Fastify)
- ETL pipeline validation
- Validation error handling
- Performance considerations
- Real-world validation scenarios

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## Related Skills
- `43-data-reliability/data-validation-rules` (Main skill)
- `43-data-reliability/data-quality-checks`
- `43-data-reliability/data-contracts`