async-await-auditor

async-await-auditor is a skill for Claude Code from StefanTheCode/dotnet-ai-toolkit. It costs 108 tokens per session (1,544 once invoked), scanned A, original, MIT.

A skill for auditing asynchronous C# and .NET code for patterns that can cause deadlocks, blocked threads, or unreliable background work. Async code lets tasks wait without blocking a thread.

In plain words
What is it for?
Use it to scan a C# file, project, solution, folder, or repository, report findings by file, and return corrected code with a short reason for each fix.
Why use it?
It helps find problems such as blocking on unfinished tasks, using async void, or mishandling cancellation before they cause hangs or concurrency bugs.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the dotnet-ai-toolkit plugin — 49 skills shipped together

Good fit Use it to scan a C# file, project, solution, folder, or repository, report findings by file, and return corrected code with a short reason for each fix.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/stefanthecode/dotnet-ai-toolkit/async-await-auditor
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.

Any agent
npx skills add StefanTheCode/dotnet-ai-toolkit --skill async-await-auditor
Clone the repo
git clone --depth 1 https://github.com/StefanTheCode/dotnet-ai-toolkit

Made for: Claude Code.

Or install dotnet-ai-toolkit, the plugin that ships this one along with the rest of its 49 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for async-await-auditor

README.md
[![agentmods](https://agentmods.dev/badge/skills/stefanthecode/dotnet-ai-toolkit/async-await-auditor/github.svg)](https://agentmods.dev/skills/stefanthecode/dotnet-ai-toolkit/async-await-auditor)
Your own site
<a href="https://agentmods.dev/skills/stefanthecode/dotnet-ai-toolkit/async-await-auditor"><img src="https://agentmods.dev/badge/skills/stefanthecode/dotnet-ai-toolkit/async-await-auditor/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for async-await-auditor

Your own site · 80×15
<a href="https://agentmods.dev/skills/stefanthecode/dotnet-ai-toolkit/async-await-auditor"><img src="https://agentmods.dev/badge/skills/stefanthecode/dotnet-ai-toolkit/async-await-auditor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 108 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,544 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 5.1 $0.00108 $0.01544
Opus 5.5 $0.00043 $0.00618
Sonnet 5.5 $0.00022 $0.00309
Haiku 4.5 $0.00011 $0.00154

Measured 2mo ago against content hash aceaed99d9f5, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

async-await-auditor 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 2mo 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.

skills/async-await-auditor/SKILL.md · 111 lines

How it starts

The opening of the file, as written. The whole thing — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Async/Await Auditor

Find async/await anti-patterns and concurrency bugs in C# code, then return corrected code with a one-line reason for each fix.

Input — point it at your code

You don't need pasted snippets. Work directly from whatever target the user gives:

  • A single file — path/to/Service.cs
  • A folder — path/to/Features/
  • A whole project or solution — a .csproj / .sln or the repo root
  • A GitHub URL — clone first, then scan: git clone --depth 1 <url> /tmp/repo && cd /tmp/repo

Find the async code yourself with Glob/Grep/Bash. Sweep for the anti-patterns first, e.g.:

grep -rn "\.Result\b\|\.Wait()\|GetAwaiter().GetResult()\|async void" --include=*.cs <target> | grep -vi "/obj/\|/bin/"
grep -rln "async Task" --include=*.cs <target>

On a large project, scan the files that matched the dangerous patterns first, then the broader async surface. Always report which files you scanned — and if it's clean, say so plainly instead of inventing issues. Group findings by file.

When this runs

The user shares async C# (services, controllers, handlers, background workers) or a project/repo and wants it reviewed, or reports a hang/deadlock/threadpool-starvation symptom. They may give a path, folder, solution, or GitHub link — scan it yourself. Only ask for more if you need to know how an entry point is called (ASP.NET Core, console, library, UI).

Workflow

  1. Read the call chain. Async correctness is about the whole chain, not one method. Identify entry points and how far async flows.
  2. Run the checklist. Flag every occurrence with severity (🔴 bug / 🟡 smell / 🟢 nit).
  3. Rewrite the code preserving behavior; call out any behavior change.
  4. Explain each fix in one line.

The checklist

1. 🔴 Sync-over-async (.Result, .Wait(), .GetAwaiter().GetResult())

Blocks a thread on an async call — deadlocks under a sync context, starves the thread pool otherwise.

  • Fix: make the chain async and await. If truly at a sync boundary you can't change, isolate it and document why.

Read the full file on GitHub · 111 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 2mo ago First seen · 111 lines · 108 tokens per session scan A aceaed99d9f5

Subscribe to this mod's changes

async-await-auditor is a skill published in the GitHub repository StefanTheCode/dotnet-ai-toolkit (26 stars, last pushed 2mo ago), licensed MIT. It adds 108 tokens to every session and 1,544 once invoked, about $0.0004 per session on Opus 5.5. 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.

Related

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async-await-auditor next to 6 skills from other repositories
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