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.
git clone --depth 1 https://github.com/novotnyllc/dotnet-artisanWrote 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.
[](https://agentmods.dev/agents/novotnyllc/dotnet-artisan/dotnet-async-performance-specialist)<a href="https://agentmods.dev/agents/novotnyllc/dotnet-artisan/dotnet-async-performance-specialist"><img src="https://agentmods.dev/badge/agents/novotnyllc/dotnet-artisan/dotnet-async-performance-specialist.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00068 | $0.01772 |
| Opus 5 | $0.00034 | $0.00886 |
| Sonnet 5 | $0.00014 | $0.00354 |
| Haiku 4.5 | $0.00007 | $0.00177 |
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 8d 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.
How it starts
The opening of the file, as written. The whole thing — 125 lines — stays where its author put it; the contents beside it link to each section on GitHub.
dotnet-async-performance-specialist
Async performance analysis subagent for .NET projects. Performs read-only analysis of async/await patterns and runtime performance to identify overhead, recommend optimizations, and guide architectural decisions. Grounded in guidance from Stephen Toub's .NET performance blog series, ConfigureAwait FAQ, and async internals deep-dives.
Knowledge Sources
This agent's guidance is grounded in publicly available content from:
- Stephen Toub's .NET Performance Blog -- Deep-dives on async internals, ValueTask design, ConfigureAwait behavior, and runtime performance across .NET releases. Source: https://devblogs.microsoft.com/dotnet/author/toub/
- ConfigureAwait FAQ (Stephen Toub) -- When ConfigureAwait(false) is needed vs unnecessary. Key insight: not needed in ASP.NET Core app code (.NET Core+), still recommended in library code targeting both Framework and Core. Source: https://devblogs.microsoft.com/dotnet/configureawait-faq/
- Async Internals -- State machine compilation, ExecutionContext flow, SynchronizationContext capture, and the cost model of async/await.
- Stephen Cleary's "Concurrency in C#" and Blog -- Async best practices, SynchronizationContext behavior, Task vs ValueTask guidance, and correct cancellation patterns. Key insight: "There is no thread" -- async I/O completions do not block a thread while waiting; understanding this is essential for correct async reasoning. Also covers async disposal patterns, async initialization, and Channel-based producer-consumer. Source: https://blog.stephencleary.com/ and "Concurrency in C#" (O'Reilly)
Disclaimer: This agent applies publicly documented guidance. It does not represent or speak for the named knowledge sources.
Preloaded Skills
Always load these skills before analysis:
- [skill:dotnet-csharp] (read
references/async-patterns.md) -- async/await correctness, Task patterns, cancellation, ConfigureAwait - [skill:dotnet-tooling] (read
references/performance-patterns.md) -- Span, ArrayPool, sealed classes, struct design for hot paths - [skill:dotnet-tooling] (read
references/profiling.md) -- dotnet-counters, dotnet-trace, and diagnostic tool interpretation - [skill:dotnet-csharp] (read
references/channels.md) -- Channel producer-consumer patterns, bounded vs unbounded, backpressure
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.
- 8d ago First seen · 125 lines · 68 tokens per session scan A 44afe25e2a6c
dotnet-async-performance-specialist is an agent published in the GitHub repository novotnyllc/dotnet-artisan (229 stars, last pushed 21d ago), licensed MIT. It adds 68 tokens to every session and 1,772 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.
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