api-tester

Design, execute, and analyze API tests for REST and GraphQL endpoints.

19|3|Updated Jan 13, 2026
One-click install
npx skills add https://github.com/louloulin/claude-agent-sdk --skill api-tester
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: api-tester
Source: https://github.com/louloulin/claude-agent-sdk/tree/main/crates/claude-agent-sdk/examples/.claude/skills/api-tester
Command: npx skills add https://github.com/louloulin/claude-agent-sdk --skill api-tester

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill standardizes API testing by enabling teams to design, execute, and analyze tests for REST and GraphQL endpoints, reducing debugging time and improving reliability.

Core Features & Use Cases

  • Test Design: Generate comprehensive test cases, create data structures, and define assertion strategies for API endpoints.
  • Test Execution: Construct HTTP requests (GET, POST, PUT, PATCH, DELETE), manage authentication, headers, and cookies, and handle various response formats (JSON, XML, plain text).
  • Response Validation: Validate status codes, verify response schemas, and measure response times.
  • Use Case: Integrate into CI/CD to continuously validate APIs during deployments, or run ad-hoc tests against new endpoints.

Quick Start

Use the API Testing Skill to quickly design and execute a starter test against your REST or GraphQL endpoint, then iterate by adding authentication and assertions.

Frequently Asked Questions about api-tester

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I automate API testing for REST and GraphQL endpoints?

Automate API testing by designing comprehensive test cases, constructing HTTP requests, handling authentication, and validating response schemas to ensure REST and GraphQL endpoint reliability. You can execute these tests ad-hoc or integrate them into CI/CD pipelines for continuous validation.

What is the best way to validate API response schemas and status codes?

Validate API response schemas by defining assertion strategies that check status codes, verify JSON or XML response structures, and measure response times. This ensures your API endpoints maintain functionality and performance standards during staging and QA cycles.

Can I integrate API tests into a CI/CD pipeline?

Yes, you can integrate API tests into CI/CD pipelines to continuously validate APIs during deployments. The skill constructs HTTP requests, manages authentication headers, and executes reusable test templates against your endpoints across staging environments.

How do I handle authentication and headers when testing APIs?

Handle authentication and headers when testing APIs by configuring credentials, cookies, and custom headers within HTTP request constructions. This allows you to securely test protected REST and GraphQL endpoints and validate their responses.

Does API testing work for both JSON and XML response formats?

Yes, API testing works for JSON, XML, and plain text response formats. The skill handles various response formats by validating status codes, verifying schemas, and measuring response times to ensure endpoint functionality across different data structures.