Contract Testing Python Packages

pact-python

Python version of Pact. Enables consumer driven contract testing, providing a mock service and DSL for the consumer project, and interaction playback and verification for the service provider project.

pact-python-ffi

Python version of Pact. Enables consumer driven contract testing, providing a mock service and DSL for the consumer project, and interaction playback and verification for the service provider project.

pact-python-cli

Python version of Pact. Enables consumer driven contract testing, providing a mock service and DSL for the consumer project, and interaction playback and verification for the service provider project.

django-contract-tester

Test utility for validating Django APIs against their OpenAPI specification

specfact-cli

The Swiss-knife CLI for validation and alignment in software delivery. Keep backlog intent, specs, tests, and code in sync across AI-assisted and brownfield delivery.

surety

A Python framework for contract testing in CI/CD pipelines. Validates communication boundaries between services without requiring a shared environment.

excelalchemy

Schema-driven Python library for typed Excel import/export workflows with Pydantic, locale-aware workbooks, pluggable storage, and contract-tested architecture.

spec-guard

Validation-First Workflow (VFW) for AI-assisted development

ai-prompt-runner

CLI tool to send prompts to an AI API and save JSON/Markdown outputs.

fild

[DEPRECATED] Use surety instead. Library to describe contracts and generate data

cvt-sdk

Contract Validator Toolkit - Python SDK for validating HTTP interactions against OpenAPI schemas

llm-assert

DEPRECATED: llm-assert has been renamed to callspec. Install with: pip install callspec

asyncapi-payload-validator

Validate JSON payloads against AsyncAPI specifications with detailed error reporting

pypony

A magical python CLI tool to contract test an API against its OAS

callspec

Contract testing for LLM tool calls.