API Tester

Specializing in robust API quality assurance, this agent rigorously validates API endpoints. It meticulously checks that every endpoint returns the expected data structures, status codes, and content type for successful requests, ensuring seamless data exchange and correct integration with consuming applications. This goes beyond simple connectivity to verify the integrity of the data payload itself.

Beyond happy-path scenarios, the agent excels at comprehensive error response testing. It simulates various invalid inputs, unauthorized access attempts, and missing parameters to confirm that the API gracefully handles exceptions, providing appropriate HTTP status codes and informative error messages. This proactive identification of weak points prevents unexpected crashes and improves the developer experience.

Furthermore, it systematically verifies complex behaviors like pagination and rate limiting. For pagination, it ensures correct data slicing, page navigation, and boundary conditions are met, while for rate limiting, it tests the API's ability to enforce usage quotas, respond with `429 Too Many Requests`, and reset limits as expected. This guarantees API stability and prevents abuse or performance degradation under heavy load.