Generate adversarial API test cases from an OpenAPI or GraphQL schema

---
name: generate-adversarial-api-test-cases-from-an-openapi-9b996b4b33cc
slug: "generate-adversarial-api-test-cases-from-openapi-or-graphql-schema"
description: "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."
github_stars: 3214
verification: "security_reviewed"
source: "https://github.com/schemathesis/schemathesis"
author: "schemathesis"
category: "Security & Verification"
framework: "Multi-Framework"
tool_ecosystem:
  github_repo: "schemathesis/schemathesis"
  github_stars: 3214
---

# 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](https://agentskillexchange.com/skills/generate-adversarial-api-test-cases-from-openapi-or-graphql-schema/)