async

Coding rules for asynchronous C# programs, including method names, safe async calls, and updates to a desktop application's user interface. Asynchronous code lets work continue without freezing the application.

In plain words
What is it for?
Use them when writing or reviewing async services, loading data, naming async methods, and updating WPF screens.
Why use it?
They help avoid deadlocks caused by blocking calls such as .Result and .Wait(), and reduce mistakes when updating the UI from background work.

Cursor rule for Cursor

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add rules/takt365/takt.wpf/async
Clone the repo
git clone --depth 1 https://github.com/Takt365/Takt.Wpf

Made for: Cursor.

Per session 396 This file is loaded in full into every session.
When invoked 396 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00396 $0.00396
Opus 5 $0.00198 $0.00198
Sonnet 5 $0.00079 $0.00079
Haiku 4.5 $0.00040 $0.00040

Measured 2d ago against content hash cc08bbc1a1c5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

async scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.cursor/rules/async.mdc · 66 lines

What it actually says

异步编程规范

异步方法命名

强制要求:异步方法必须以 Async 结尾

// ✅ 正确
public async Task<List<UserDto>> GetUsersAsync() { }
public async Task<UserDto> GetUserByIdAsync(int id) { }

// ❌ 错误
public async Task<List<UserDto>> GetUsers() { }  // 缺少 Async 后缀

示例文件

  • @src/Takt.Application/Services/(查看实际异步方法)

异步调用规范

禁止使用 .Result.Wait()

// ✅ 正确:使用 async/await
private async Task LoadUsersAsync()
{
    var result = await _userService.GetListAsync();
    if (result.Success)
    {
        Users = new ObservableCollection<UserDto>(result.Data);
    }
}

// ❌ 错误:使用 .Result 或 .Wait()
private void LoadUsers()
{
    var result = _userService.GetListAsync().Result;  // ❌ 死锁风险
    _userService.GetListAsync().Wait();  // ❌ 死锁风险
}

UI 线程操作

规范:在后台线程执行,回到 UI 线程更新

// ✅ 正确
private async Task LoadUsersAsync()
{
    var users = await _userService.GetListAsync();  // 后台线程
    
    // 自动回到 UI 线程(如果 ViewModel 在 UI 线程创建)
    Users = new ObservableCollection<UserDto>(users);
    
    // 或者显式调度到 UI 线程
    Application.Current.Dispatcher.Invoke(() =>
    {
        Users = new ObservableCollection<UserDto>(users);
    });
}
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 66 lines · 396 tokens per session scan A cc08bbc1a1c5

Subscribe to this mod's changes

async is a cursor rule published in the GitHub repository Takt365/Takt.Wpf (17 stars, last pushed 8mo ago), licensed MIT. It adds 396 tokens to every session, about $0.0020 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.