# resilience

A skill that tells your coding agent how to build fault-tolerant calls in .NET 10 with Polly v8: retries, circuit breakers, timeouts, fallback.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 2800 installs · ★ 789
- Author: codewithmukesh
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/codewithmukesh/dotnet-claude-kit/tree/HEAD/skills/resilience/SKILL.md
- Updated: 2026-08-07
- HTML: https://affpapa.org/en/nevibecode/skills/resilience

## What it does

The skill teaches the agent how to write failure-handling code with Polly v8. It ships principles plus worked examples: retry with exponential backoff and jitter, circuit breaker, per-attempt and total timeouts, fallback, rate limiter, hedging, and composing strategies into a single pipeline.

The core point it pushes at the model: Polly v8 replaced `Policy` with `ResiliencePipeline`, and HTTP clients get their pipeline through `AddResilienceHandler` or `AddStandardResilienceHandler` from `Microsoft.Extensions.Http.Resilience`. Strategies are chained, not nested, and execute outer to inner. Order matters here. Put a per-attempt timeout outside the retry and your retries lose their own time limit.

It targets .NET 10 and Polly v8. On a project still running Polly v7 with `PolicyBuilder` and `ISyncPolicy`, the examples won't line up with your code — worth checking package versions before letting the agent edit anything. The telemetry section is cut off, so expect less detail on metering and OpenTelemetry.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add codewithmukesh/dotnet-claude-kit --skill resilience -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/resilience/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/resilience/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add codewithmukesh/dotnet-claude-kit --skill resilience -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/resilience/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add codewithmukesh/dotnet-claude-kit --skill resilience -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/resilience/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install codewithmukesh/dotnet-claude-kit resilience
```

2. **Manually: put the files in place**
- File: `.github/skills/resilience/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add codewithmukesh/dotnet-claude-kit --skill resilience -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/codewithmukesh/dotnet-claude-kit --path skills/resilience
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/resilience/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add codewithmukesh/dotnet-claude-kit --skill resilience -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/codewithmukesh/dotnet-claude-kit/tree/HEAD/skills/resilience/SKILL.md

## When to use it
- set up retries with exponential backoff for HTTP calls
- add a circuit breaker so one failing service doesn't drag the rest down
- apply a per-attempt timeout and an overall request deadline
- chain several strategies into one pipeline in the right order
- return a fallback response once retries are exhausted

## Example prompts
- add retry and circuit breaker to the HttpClient for the payment gateway using Polly v8
- build a resilience pipeline for database calls with retry on deadlock
- set up hedging for the search service when a response takes longer than 500 ms

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 98370f2a4f92a52a.

BEGIN THIRD-PARTY FILE 98370f2a4f92a52a
````text
---
name: resilience
description: >
  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".
---

# 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)

```csharp
// Program.cs — Standard resilience handler covers 90% of use cases
builder.Services.AddHttpClient<IPaymentGateway, PaymentGatewayClient>(client =>
{
    client.BaseAddress = new Uri("https://api.payments.example.com");
})
.AddStandardResilienceHandler(); // Retry + circuit breaker + timeout out of the box

// That's it. The standard handler configures:
// - Retry: 3 attempts, exponential backoff, jitter
// - Circuit breaker: 10% failure ratio over 30s sampling, 30s break
// - Attempt timeout: 10s per attempt
// - Total request timeout: 30s
```

**Why**: `AddStandardResilienceHandler()` from `Microsoft.Extensions.Http.Resilience` applies production-ready defaults. Override only when you need different thresholds.

### Custom HTTP Resilience Configuration

```csharp
builder.Services.AddHttpClient<ICatalogService, CatalogServiceClient>(client =>
{
````
END THIRD-PARTY FILE 98370f2a4f92a52a

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First 2602 of 12736 bytes. © codewithmukesh · MIT · https://github.com/codewithmukesh/dotnet-claude-kit/tree/HEAD/skills/resilience/SKILL.md

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---
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