Csharp Async Agent Skill

by github

Get best practices for C# async programming

465 tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

37394

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/github/awesome-copilot --skill csharp-async

The instruction itself

7 sections, as written by the author

C# Async Programming Best Practices

Your goal is to help me follow best practices for asynchronous programming in C#.

Naming Conventions

Use the 'Async' suffix for all async methods
Match method names with their synchronous counterparts when applicable (e.g., GetDataAsync() for GetData())

Return Types

Return Task<T> when the method returns a value
Return Task when the method doesn't return a value
Consider ValueTask<T> for high-performance scenarios to reduce allocations
Avoid returning void for async methods except for event handlers

Exception Handling

Use try/catch blocks around await expressions
Avoid swallowing exceptions in async methods
Use ConfigureAwait(false) when appropriate to prevent deadlocks in library code
Propagate exceptions with Task.FromException() instead of throwing in async Task returning methods

Performance

Use Task.WhenAll() for parallel execution of multiple tasks
Use Task.WhenAny() for implementing timeouts or taking the first completed task
Avoid unnecessary async/await when simply passing through task results
Consider cancellation tokens for long-running operations

Common Pitfalls

Never use .Wait(), .Result, or .GetAwaiter().GetResult() in async code
Avoid mixing blocking and async code
Don't create async void methods (except for event handlers)
Always await Task-returning methods

Implementation Patterns

Implement the async command pattern for long-running operations
Use async streams (IAsyncEnumerable<T>) for processing sequences asynchronously
Consider the task-based asynchronous pattern (TAP) for public APIs

When reviewing my C# code, identify these issues and suggest improvements that follow these best practices.

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How to use it

Copy the folder

Take github/csharp-async from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.