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resilience

Resilience patterns for .NET 10 applications using Polly v8. Covers retry, circuit breaker, timeout, fallback, rate limiter, hedging, and composing resilience pipelines. Load this skill when implementing retry logic, circuit breakers, handling transient failures, or when the user mentions "Polly", "resilience", "retry", "circuit breaker", "timeout", "fallback", "rate limit", "hedging", "transient fault", "HttpClient resilience", or "resilience pipeline".

skills/resilience/SKILL.md

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# Resilience

## Core Principles

1. **Polly v8 resilience pipelines, not v7 policies** — Polly v8 replaced `Policy` with `ResiliencePipeline`. Never use `PolicyBuilder`, `Policy.Handle<>()`, or `ISyncPolicy`. The new API is composable, type-safe, and integrates natively with `IHttpClientFactory`.
2. **Configure via `AddResilienceHandler`, not manual wrapping** — For HTTP calls, use `Microsoft.Extensions.Http.Resilience` which adds pipelines directly to `HttpClient` via DI. No manual `ExecuteAsync` wrapping.
3. **Compose strategies, don't nest them** — A single `ResiliencePipeline` can chain retry + circuit breaker + timeout. Strategies execute outer-to-inner (first added = outermost). No need for nested try/catch or manual orchestration.
4. **Always set timeouts** — Every external call needs a timeout. Use Polly's `AddTimeout()` as the innermost strategy so it applies per-attempt, and optionally an outer timeout for total elapsed time.
5. **Instrument everything** — Polly v8 emits `Metering` events and supports `TelemetryOptions` for OpenTelemetry. Use them to monitor retry rates, circuit breaker state, and timeout frequency.

## Patterns

### HTTP Client Resilience (Recommended Default)