Modern Csharp Coding Standards

Aaron Namba's skill pushes you toward modern C# idioms that actually matter: records for immutable types, pattern matching over verbose conditionals, and CancellationToken parameters everywhere async happens. The performance guidance is practical, not theoretical. Use Span<T> and ArrayPool<T> where allocations hurt, skip AutoMapper for explicit mapping, and handle business errors with Result types instead of exceptions. It includes four reference files covering value objects, API design, composition patterns, and reflection anti-patterns. If you're still writing C# like it's 2015 or cargo-culting patterns from Stack Overflow, this will modernize your instincts without the usual enterprise architecture bloat.

skills.sh installs: 2.3K
GitHub stars: 1.3K
last updated: Aug 21, 2026

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Install

$ npx -y skills add aaronontheweb/dotnet-skills --skill modern-csharp-coding-standards --agent claude-code

Installs into .claude/skills of the current project.

Files

Modern C# Coding Standards

When to Use This Skill

Use this skill when:

Writing new C# code or refactoring existing code
Designing public APIs for libraries or services
Optimizing performance-critical code paths
Implementing domain models with strong typing
Building async/await-heavy applications
Working with binary data, buffers, or high-throughput scenarios

Reference Files

value-objects-and-patterns.md: Full value object examples and pattern matching code
performance-and-api-design.md: Span/Memory examples and API design principles
composition-and-error-handling.md: Composition over inheritance, Result type, testing patterns
anti-patterns-and-reflection.md: Reflection avoidance and common anti-patterns