Domain Contract Validator

Define, generate, and enforce business rule assertions as automated checks that run independently of unit tests. While unit tests verify individual functions, domain contracts verify that the system as a whole respects business rules, API agreements, data schemas, and cross-service invariants. Contracts are deterministic, produce pass/fail results, and can be integrated into CI/CD pipelines as quality gates.

When to Use This Skill

Use this skill when:

• You need to enforce API contracts between services (consumer-driven contract testing)
• Database schema changes must be validated against application expectations
• Event schemas (Kafka, RabbitMQ, SNS) must conform to agreed formats
• Business rules span multiple modules and cannot be verified by a single unit test
• You want to catch contract violations early in CI, not in production
• You are defining deterministic guardrails for an AI agent workflow

Trigger phrases: "contract testing", "domain contracts", "schema validation", "API contract", "consumer-driven contracts", "business rule enforcement", "invariant checking", "pact testing", "schema registry"

What This Skill Does