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r3-reactive-extensions

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Build reactive/event-driven C# with R3 (Cysharp's modern reimplementation of Reactive Extensions). Covers the Observable<T>/Observer<T> model, the OnErrorResume error contract, async dispatch with AwaitOperation, Task/IAsyncEnumerable integration, TimeProvider/FrameProvider scheduling, the concurrency contract, and how R3 differs from System.Reactive (Rx.NET).

skills/r3-reactive-extensions/SKILL.md

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# R3: Modern Reactive Extensions for .NET

R3 is [Cysharp's](https://github.com/Cysharp/R3) ground-up reimplementation of Reactive
Extensions — "the new future of dotnet/reactive and UniRx." It keeps the LINQ-over-events
programming model but rebuilds the core types, error contract, and scheduler to fix
long-standing problems in `System.Reactive` (Rx.NET). Use this skill when composing event
streams, UI input, timers, or push-based pipelines in C#.

**Canonical sources** (link to these from code and docs):
- Repository: https://github.com/Cysharp/R3
- README (full operator reference): https://github.com/Cysharp/R3/blob/main/README.md
- Author's design rationale: https://neuecc.medium.com/r3-a-new-modern-reimplementation-of-reactive-extensions-for-c-cf29abcc5826

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