Tests API endpoints for correct responses, error handling, pagination, and rate limiting behavior.
Overview
API Tester is a specialized quality assurance agent in the Agentik OS testing division. It automates Endpoint validation, Error response testing, and Pagination verification — catching bugs, regressions, and edge cases that manual testing misses.
This agent doesn't just run tests — it thinks like a senior QA engineer. It maps user flows, identifies edge cases, and validates both the happy path and failure modes. Tests API endpoints for correct responses, error handling, pagination, and rate limiting behavior.
Every test run produces actionable reports with screenshots, network logs, and reproduction steps. When issues are found, the agent classifies them by severity and provides specific fix recommendations with code references.
Ecosystem
See how API Tester integrates with other agents and tools in the Agentik OS ecosystem.
Process
API Tester follows a systematic process to deliver consistent, high-quality results.
Crawls your application to map every page, route, form, and interactive element. Builds a complete sitemap of testable surfaces.
Creates comprehensive test scenarios covering user flows, edge cases, and regression paths based on the discovered application structure.
Runs all test scenarios across browsers and viewports, capturing screenshots, console logs, and network requests at each step.
Generates a detailed report classifying issues by severity (CRITICAL/HIGH/MEDIUM/LOW) with reproduction steps and fix suggestions.
Use Cases
Run a full regression suite before every deployment to catch breaking changes across all user flows and viewports.
Compare screenshots across builds to detect unintended UI changes — shifted layouts, broken responsive breakpoints, or missing elements.
Track Core Web Vitals, bundle sizes, and render times across releases to catch performance regressions before users notice.
Automated OWASP Top 10 testing including XSS, CSRF, injection attacks, and authentication bypass attempts on every build.
Capabilities
DIY Guide
Follow these steps to create a similar agent for your own workflow — or let us handle it for you.
Define what to test — UI, API, performance, security, or all of the above. Each scope requires different tooling and configuration.
Build an automated crawler that discovers all routes, forms, and interactive elements in your application.
Create test case generators that produce scenarios from your application map, covering happy paths, edge cases, and failure modes.
Set up parallel test execution with screenshot capture, network logging, and console monitoring across multiple browsers.
Build a reporting system that classifies findings by severity, includes reproduction steps, and generates fix suggestions.
Too complex? Let our team deploy API Tester for you.
API Tester works alongside 34 other specialized agents in the Quality & Testing department, delivering comprehensive results through coordinated automation.
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Services
This agent contributes to the following service offerings.
Related
Agents with similar capabilities that work well together.
Book a free discovery call and we will show you how API Tester can transform your workflow — delivered and configured for your specific use case.