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.

ordeal

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

microburst

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

qa-orchestrator

Injects faults into a machine under test, drives the walks, and checks that bmc-sensor-audit reached the verdict it should have. A referee that shipped its own fault injection would be certifying itself, which is why this is a separate program.

faultlib

Programmable network fault injection

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.

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.

chaotic-ngine

Chaos for Clouds

faultbench

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

agentbreak

infrastructure chaos to test the resilience of ai agents

simloop

Deterministic simulation testing for Python asyncio: seeded scheduling, virtual time, simulated network faults, exact replay from a seed

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 side-channel and fault-injection hardware: live waveforms, capture, CPA, glitch sweeps, UART/SPI/JTAG/SWD interfaces, a logic analyser with protocol decoders, firmware code mapped onto the power trace, notebooks, one-click firmware builds and an MCP server for AI agents. Linux, Windows, macOS.

aws-chaos-engineering-framework

Break AWS safely before reality does: enterprise-grade FIS orchestration, GovCloud guardrails, rollback, and audit-ready evidence in one Python file.

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

Open-source MBIST generator for OpenRAM SRAM macros with BIRA/BISR redundancy repair (row + column, tester-driven and autonomous on-chip), a shared-bus multi-memory controller, and a programmable march-algorithm fault-model research platform.

mcp-drill

Fault injection and reliability scoring for MCP servers

ai-cluster-chaos-fidelity

A machine-checkable standard for AI-cluster chaos engineering: which fault injection tests which layer. Fidelity linter + spec schema + 20-experiment catalog. A pod kill is not an XID; tc/netem is not an InfiniBand flap.

fastmock

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

agentproof-sim

Stateful simulation and fault-injection testing for tool-using AI agents.

effectfence

Crash and retry side-effect safety verification for distributed systems

fhe-attack-replay

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

torchei

TorchEI is a high-speed toolbox for DNN Reliability's Research and Development