Generate adversarial API test cases from an OpenAPI or GraphQL schema

Use Schemathesis when an agent needs to turn an API schema into broad negative and edge-case coverage instead of hand-writing examples. The skill exercises live endpoints or app hooks, explores unexpected combinations, and reports failures that ordinary happy-path tests miss.

Installation

Use the upstream install or setup path that matches your environment:

• uv pip install schemathesis

Requirements and caveats from upstream:

• <img src="https://img.shields.io/pypi/pyversions/schemathesis.svg" alt="Python versions">
• Python Tests:
• python

Basic usage or getting-started notes:

• uvx schemathesis run https://example.schemathesis.io/openapi.json

• uvx schemathesis run https://your-api.com/openapi.json

• Command Line:

• Source: https://github.com/schemathesis/schemathesis

• Extracted from upstream docs: https://raw.githubusercontent.com/schemathesis/schemathesis/HEAD/README.md

Source

• Agent Skill Exchange