Deterministic scenario simulator for frontend QA: stateful CRUD routes, seeded RNG, virtual clock, response sequences, faults and overrides, SSE and WebSocket routes with scheduled events and resume, per-run isolation, inspectable event log. Runtime-neutr

Governed QuickJS isolation for user-authored JavaScript with async host capabilities, execution budgets, and structured faults.

Network / page-lifecycle / JS-runtime fault injection primitives for Playwright. Extracted from chaosbringer.

Hubot plugin to grab information about Honeybadger.io faults

Local SolarEdge inverter in HomeKit over Modbus TCP / SunSpec: power, energy, temperature, status and faults. No cloud.

Denpex MCP server, diagnose GPU/ML training failures (CUDA OOM, NCCL timeouts, Xid faults, NaN loss) from Claude Desktop, Cursor, or Claude Code, with optional explicit zero-egress mode.

The moirae engine: deterministic simulation testing for distributed systems. Clock, event queue, PRNG, network faults, invariants, JSONL trace. Zero dependencies.

Command line utilities for viewing events in your event lake, replaying events, resubmitting faults and more

Fork of soap. Supports xml attributes and soap faults.

Two commands over the pi-umbra family: /umb-help lists what is installed and how to configure it, /umb-doctor reports the faults that would otherwise stay silent.

express-faulty simulates faults in your Express.js web applications

Enterprise-grade LLM mock server for local and CI: scenarios, faults, latency, contracts, VCR. Supports standalone server and Express middleware.

Enterprise-grade LLM mock server for local and CI: scenarios, faults, latency, contracts, VCR. Supports standalone server and Express middleware.

Local drop-in replacement services for CI and no-network sandboxes

Schedule deterministic runtime faults and timed assertions to test error handling.

Framework-agnostic server-side fault injection (5xx + latency) for Web Standard Request/Response.

SN009 – Seasonal Lockout Check (Magra Core). OAT-based lockout for heating/cooling with FDD for OAT sensor faults.

Playwright-based chaos testing tool for web applications

Plan-mode composer control: the conversation.input.plan seat over the plan projection and the /plan command channel

An MCP server that injects tool faults on purpose, so you can test how your agent copes when a tool errors, stalls, truncates, or quietly returns the wrong answer.