Individual skill

resilience-circuit-breaker-designer

Designs circuit breakers, bulkhead concurrency limits, fallback caches, and timeout policies for failing dependencies.

skills/development/resilience-circuit-breaker-designer/SKILL.md

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## Purpose

Protect applications from cascading failures when downstream dependencies (third-party APIs, microservices, databases) become slow or unresponsive, using Circuit Breakers, Bulkheads, Timeouts, and Graceful Fallbacks.

## When to Use

- Calling third-party APIs (Stripe, Twilio, OpenAI, shipment tracking) that occasionally degrade.
- Preventing thread/connection exhaustion when one downstream microservice stalls.
- Implementing graceful degradation (e.g. returning cached recommendations when AI engine is down).

## What to Analyze

1. **Circuit States**: `CLOSED` (normal), `OPEN` (failing fast without calling downstream), `HALF-OPEN` (probing recovery).
2. **Threshold Metrics**: Failure percentage threshold (e.g. >50% errors over 20 requests) and slow call duration threshold.