Resilience Testing Python Packages

ordeal

Automated chaos testing for Python — fault injection, property assertions, and stateful exploration

agentbreak

Chaos proxy for testing LLM agent resilience — inject faults like latency, errors, and bad responses. Supports OpenAI, Anthropic, and MCP.

pytest-resilience-agent

pytest plugin that runs your LLM app under controlled chaos (timeouts, brownouts, rate limits, MCP errors, composed failures) and asserts it still meets its contract

ychaos

YChaos - The Resilience Framework by Yahoo!

chaosmonkey

A Chaos Engineering swiss army knife

toxic-proxy

An asyncio tcp proxy for network resilience testing