Fault Injection Python Packages

testguard-cli

Claim-driven mutation testing: inject faults and report what your tests miss. Vitest, Jest, Playwright, pytest & unittest. Part of the Guard family with DocGuard and WebSec Validator.

microburst

AWS failure injection proxy — protocol-aware faults (throttling, latency, resets) that exercise real SDK retry behavior. Works against MiniStack, moto, or real AWS.

ordeal

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

mockly-driver

Cross-platform, multi-protocol mock server — HTTP, WebSocket, gRPC, GraphQL, TCP, Redis, SMTP, MQTT, NATS, SNMP, DNS, AMQP, Kafka, LDAP, IMAP, FTP, Memcached, STOMP, CoAP, and SIP — with a web UI, REST API, scenario system, and fault injection.

faultlib

Programmable network fault injection

qa-orchestrator

Inject faults into a substrate, drive captures, and check the referee reached the verdict it should have.

mockly-testcontainers

Cross-platform, multi-protocol mock server — HTTP, WebSocket, gRPC, GraphQL, TCP, Redis, SMTP, MQTT, NATS, SNMP, DNS, AMQP, Kafka, LDAP, IMAP, FTP, Memcached, STOMP, CoAP, and SIP — with a web UI, REST API, scenario system, and fault injection.

actseal

Test frozen model decision policies with risk/coverage bounds, provider-fault checks and offline replay.

faultbench

Fake, stateful worlds with fault injection for testing tool-using AI agents. Exposed over MCP, asserted from pytest.

chaotic-ngine

Chaos for Clouds.

agentbreak

infrastructure chaos to test the resilience of ai agents

simloop

Deterministic simulation testing for Python asyncio: seeded scheduling, virtual time, replayable failures

faultforge

A framework for running reproducible hardware fault-injection experiments on PyTorch models - with support for error-corrected memory reliability testing.

chipwhisperer-studio

Desktop app for ChipWhisperer hardware: live waveforms, capture, CPA, glitch sweeps, UART/SPI/JTAG/SWD interfaces, a logic analyser, firmware code on the power trace, notebooks, firmware builds and an MCP server

aws-chaos-engineering-framework

Guarded AWS FIS orchestration and one-file chaos engineering extensions

khaos-cli

Kafka data generator and load testing tool - generate fake messages, simulate producers and consumers, test broker failures, and run chaos engineering scenarios

autombist

MBIST wrapper and fault-flow generator

mcp-drill

Fault injection and reliability scoring for Model Context Protocol (MCP) servers.

fastmock

FastMock is a FastAPI middleware for mocking responses based on Pydantic models response

ai-cluster-chaos-fidelity

A machine-checkable standard for AI-cluster chaos-engineering fidelity: which fault injection tests which layer.

agentproof-sim

Stateful simulation and fault-injection testing for AI agents that take actions through tools.

fhe-attack-replay

Unified attack-replay regression harness for FHE libraries (SEAL, OpenFHE, Lattigo, tfhe-rs).

effectfence

Crash/retry side-effect safety verifier

torchei

A toolbox about DNN Reliability