A comprehensive testing suite for validating API contracts, ensuring backward compatibility, and detecting breaking changes in microservices.
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install api-contract-tester
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install api-contract-tester using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is API Contract Tester?
The API Contract Tester is a robust tool designed to maintain the integrity of service-to-service communication. By leveraging consumer-driven contract testing principles, it ensures that both providers and consumers adhere to a shared agreement, preventing the dreaded 'dependency hell' in distributed systems. As a key part of the Openclaw Skills ecosystem, it bridges the gap between API design and runtime reality.
This skill automates the validation of OpenAPI and Swagger specifications, generates targeted test suites in Python, and monitors for breaking changes in real-time. Whether you are managing a complex microservices architecture or a simple REST API, this skill provides the guardrails necessary to deploy with confidence and maintain high system reliability.
API Contract Tester Use Cases
- Validating that a provider service still honors the expectations of its consumers before a deployment.
- Detecting breaking changes in OpenAPI specifications during CI/CD pipelines.
- Automatically generating happy-path and edge-case tests based on existing API documentation.
- Mapping consumer dependencies to identify unused endpoints for deprecation.
- Checking backward compatibility between different versions of an API spec in Git.
How API Contract Tester Works
- Scanning: The skill searches the repository for OpenAPI, Swagger, or Pact-style contract files.
- Generation: It parses these specifications to create functional contract tests, covering happy paths, auth requirements, and type validation.
- Verification: It executes requests against the provider base URL to ensure the live API matches the defined schema.
- Comparison: For versioning, it compares the current spec against previous Git versions to flag removals or type changes.
- Reporting: It generates a detailed impact report, classifying changes as breaking or non-breaking and providing migration recommendations.
API Contract Tester Setup
To integrate this into your Openclaw Skills environment, ensure you have the necessary validation dependencies installed:
# Install the OpenAPI validator
pip install openapi-spec-validator
# Install Pact verifier (if using Pact contracts)
npm install -g @pact-foundation/pact-node
# Ensure your environment has access to the provider URL
export PROVIDER_URL="https://api.staging.example.com"
API Contract Tester Data Schema & Taxonomy
The skill organizes its outputs and analysis using the following structure:
| Data Object | Format | Description |
|---|---|---|
| Contract Tests | .py (pytest) |
Generated Python classes for endpoint validation. |
| Change Report | Markdown | A categorized list of breaking vs. non-breaking changes. |
| Compatibility Matrix | Plain Text Table | A mapping of which consumers call specific API endpoints. |
| Specs | .yaml / .json |
The source of truth OpenAPI or Pact files used for validation. |
API Contract Tester Advanced Features
- Multi-version comparison: Automatically pulls previous spec versions from Git history (HEAD~1 or main) for regression analysis.
- Automated Migration Guides: Generates actionable migration steps for developers when a breaking change is detected.
- Dependency Discovery: Uses regex-based code scanning across multiple languages (JS, TS, Python) to find undocumented API consumers.
- Intelligent Type Checking: Detects subtle breaking changes like tightened validation patterns or removed enum values.
SKILL.md
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