# Resilience

> Passive guardrail that enforces Netflix Chaos Engineering principles. Install globally — automatically applies circuit breakers, fallbacks, and chaos hypotheses whenever writing code that touches external dependencies.

- Skill: `tyecode/resilience` (Agent Skill)
- Install (CLI): `npx skillmds@latest add tyecode/resilience`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tyecode/resilience/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tyecode (https://skillmd.com/u/tyecode)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tyecode/resilience

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# Skill: resilience

## When to Use This Skill

This is a passive guardrail — install it globally and it applies automatically. The agent enforces these patterns whenever it writes code that makes network requests, touches external dependencies, or ships a feature. You do not need to invoke it explicitly.

## The Core Philosophy

**Embrace failure.** Assume the network will fail, the database will timeout, and the third-party API will return a 500. You are not allowed to build "happy path only" code.

## Mandatory Implementation Rules

Whenever you write a feature that depends on external resources, you must implement the following resilience patterns:

### 1. Circuit Breakers & Retries
- Never make a raw API call without a timeout.
- Implement exponential backoff for retries.
- Implement a circuit breaker to stop cascading failures if a dependency is down.

### 2. Graceful Fallbacks
- What happens when the service fails? You must provide a fallback mechanism.
- If the recommendation engine fails, return a hardcoded list of popular items. If the user profile fails to load, degrade the UI gracefully rather than showing a white screen of death.

### 3. State Your Chaos Hypothesis
Before providing the final code, state 3 ways the system could fail in production (e.g., "Hypothesis 1: The payment gateway takes 30 seconds to respond."). Show explicitly how your code handles those specific failure states.