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.
npx skills add managedcode/dotnet-skills --skill mvvmgit clone --depth 1 https://github.com/managedcode/dotnet-skillsWrote 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/skills/managedcode/dotnet-skills/mvvm)<a href="https://agentmods.dev/skills/managedcode/dotnet-skills/mvvm"><img src="https://agentmods.dev/badge/skills/managedcode/dotnet-skills/mvvm/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.
<a href="https://agentmods.dev/skills/managedcode/dotnet-skills/mvvm"><img src="https://agentmods.dev/badge/skills/managedcode/dotnet-skills/mvvm.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00120 | $0.02392 |
| Opus 5.5 | $0.00048 | $0.00957 |
| Sonnet 5.5 | $0.00024 | $0.00478 |
| Haiku 4.5 | $0.00012 | $0.00239 |
Grade A, and why
mvvm 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 1mo 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- dotnet-mvvm — 92% identical, 6 lines differ
How it starts
The opening of the file, as written. The whole thing — 378 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MVVM Pattern for .NET
Trigger On
- implementing UI separation with Model-View-ViewModel
- using MVVM Toolkit (CommunityToolkit.Mvvm) for ViewModels
- designing testable UI architecture
- handling commands, property changes, and messaging
- choosing between MVVM frameworks
Documentation
References
See detailed examples in the references/ folder:
patterns.md— ViewModel, command, navigation, and state patternsanti-patterns.md— Common mistakes and how to fix them
Core Concepts
| Component | Responsibility | Example |
|---|---|---|
| Model | Business logic and data | Product, Order, User |
| View | UI presentation (XAML/Razor) | ProductPage.xaml |
| ViewModel | UI logic and state | ProductViewModel |
Workflow
- Keep Views dumb — no business logic in code-behind
- Use data binding — connect View to ViewModel properties
- Commands for actions — handle user interactions via ICommand
- Inject dependencies — services go into ViewModel constructors
- Test ViewModels — they should be unit testable without UI
MVVM Toolkit Setup
<PackageReference Include="CommunityToolkit.Mvvm" Version="8.*" />
ViewModel Patterns
Basic ViewModel with Source Generators
public partial class ProductViewModel(IProductService productService) : ObservableObject
{
[ObservableProperty]
private string _name = string.Empty;
[ObservableProperty]
private decimal _price;
[ObservableProperty]
[NotifyCanExecuteChangedFor(nameof(SaveCommand))]
private bool _isValid;
[RelayCommand(CanExecute = nameof(CanSave))]
private async Task SaveAsync()
{
await productService.SaveAsync(new Product { Name = Name, Price = Price });
}
private bool CanSave() => IsValid && !string.IsNullOrEmpty(Name);
}
What ships with it
3 files 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.
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.
- 1mo ago First seen · 378 lines · 120 tokens per session scan A c2ef7dacf119
mvvm is a skill published in the GitHub repository managedcode/dotnet-skills (496 stars, last pushed yesterday), licensed MIT. It adds 120 tokens to every session and 2,392 once invoked, about $0.0005 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 2026-09-03.
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