Qa Api Testing Contracts

What it does

This skill enables AI agents to automatically generate and execute API tests based on OpenAPI specifications. It validates that actual API responses align with the documented contract, ensuring data types, required fields, and response structures match expectations without writing manual test scripts.

When to use it

• Contract Validation: Verify that backend changes haven't broken the agreed-upon interface before deployment.
• Documentation Driven Testing: Automatically generate regression tests whenever an OpenAPI spec is updated.
• CI/CD Integration: Run automated checks in pipelines to catch breaking changes early in the development cycle.
• Third-party API Assurance: Validate integrations with external services by comparing their live responses against their published documentation.

Key capabilities

• Parses OpenAPI/Swagger definitions to understand expected request/response schemas.
• Generates test cases covering valid inputs, missing required fields, and incorrect data types.
• Executes HTTP requests against target endpoints and compares results against the contract.
• Reports discrepancies where actual responses deviate from the defined specification.

Example prompts

• "Generate a suite of API tests for my user registration endpoint using this OpenAPI spec."
• "Run contract validation on the production /api/v2/orders endpoint and list any schema mismatches."
• "Create automated tests that verify all required fields in the payment response match the documented contract."

Tips & gotchas

Ensure your OpenAPI specification is up-to-date; the skill cannot validate against a contract that doesn't reflect the current API behavior. This approach works best when the API team treats the specification as the single source of truth for interface definitions.