dotnet-async-performance-specialist

dotnet-async-performance-specialist is an agent for Claude Code from wshaddix/dotnet-skills. It costs 67 tokens per session (1,597 once invoked), scanned A, original, no licence file.

A guide for finding and fixing async and thread-related performance issues in .NET applications. It covers choices such as ValueTask, ConfigureAwait, IO.Pipelines, ThreadPool settings, and channels.

In plain words
What is it for?
Use it to review async/await performance, check ValueTask usage, choose ConfigureAwait behavior, tune ThreadPool settings, or select a suitable channel implementation.
Why use it?
It helps identify inefficient or incorrect ways of running asynchronous work and handling background threads. This reduces guesswork when tuning code that waits for input or runs tasks concurrently.

Agent for Claude Code

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

Part of the dotnet-skills plugin — 167 skills, 12 commands, 16 agents shipped together

Good fit Use it to review async/await performance, check ValueTask usage, choose ConfigureAwait behavior, tune ThreadPool settings, or select a suitable channel implementation.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/wshaddix/dotnet-skills/dotnet-async-performance-specialist
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.

Clone the repo
git clone --depth 1 https://github.com/wshaddix/dotnet-skills

Made for: Claude Code.

Or install dotnet-skills, the plugin that ships this one along with the rest of its 167 skills, 12 commands, 16 agents.

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 dotnet-async-performance-specialist

README.md
[![agentmods](https://agentmods.dev/badge/agents/wshaddix/dotnet-skills/dotnet-async-performance-specialist/github.svg)](https://agentmods.dev/agents/wshaddix/dotnet-skills/dotnet-async-performance-specialist)
Your own site
<a href="https://agentmods.dev/agents/wshaddix/dotnet-skills/dotnet-async-performance-specialist"><img src="https://agentmods.dev/badge/agents/wshaddix/dotnet-skills/dotnet-async-performance-specialist/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 dotnet-async-performance-specialist

Your own site · 80×15
<a href="https://agentmods.dev/agents/wshaddix/dotnet-skills/dotnet-async-performance-specialist"><img src="https://agentmods.dev/badge/agents/wshaddix/dotnet-skills/dotnet-async-performance-specialist.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 67 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,597 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.
Origin unknown 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 $0.00067 $0.01597
Opus 5 $0.00034 $0.00798
Sonnet 5 $0.00013 $0.00319
Haiku 4.5 $0.00007 $0.00160

Measured 9d ago against content hash cf1148e96fd7, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

dotnet-async-performance-specialist 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 9d 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.

agents/dotnet-async-performance-specialist.md · 112 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 9d ago First seen · 112 lines · 67 tokens per session scan A cf1148e96fd7

Subscribe to this mod's changes

dotnet-async-performance-specialist is an agent published in the GitHub repository wshaddix/dotnet-skills (79 stars, last pushed 6mo ago), with no licence file. It adds 67 tokens to every session and 1,597 once invoked, about $0.0003 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.