Every Python microservice eventually faces the same nightmare: one slow dependency cascades into a full outage. pyresilience solves this with a single decorator that gives you retry, circuit breaker, timeout, fallback, bulkhead, rate limiter, and cache — all coordinated, zero dependencies, and 10x faster than tenacity. If you've ever wired together five libraries just to stop your service from falling over at 3 AM, this replaces all of it with one line.