Sends HTTP requests to REST and GraphQL API endpoints, validates response codes, headers, and payloads, measures response times against SLA thresholds, generates structured test suites, and produces test reports covering functional, security, and performance scenarios. Use when the user asks about testing APIs, validating endpoints, checking HTTP status codes or response bodies, load testing, stress testing, debugging REST or GraphQL services, testing authentication flows, checking rate limiting, detecting SQL injection or OWASP API vulnerabilities, or integrating API tests into CI/CD pipelines.