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 christian289/dotnet-with-claudecode --skill understanding-wpf-content-modelgit clone --depth 1 https://github.com/christian289/dotnet-with-claudecodeWrote 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/christian289/dotnet-with-claudecode/understanding-wpf-content-model)<a href="https://agentmods.dev/skills/christian289/dotnet-with-claudecode/understanding-wpf-content-model"><img src="https://agentmods.dev/badge/skills/christian289/dotnet-with-claudecode/understanding-wpf-content-model/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/christian289/dotnet-with-claudecode/understanding-wpf-content-model"><img src="https://agentmods.dev/badge/skills/christian289/dotnet-with-claudecode/understanding-wpf-content-model.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Excessive Agency · line 4 Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.Fix: Remove the model/provider override or disclose it prominently and require explicit operator approval before invoking an external coding CLI or billed model.
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 | $0.00033 | $0.01466 |
| Opus 5 | $0.00016 | $0.00733 |
| Sonnet 5 | $0.00007 | $0.00293 |
| Haiku 4.5 | $0.00003 | $0.00147 |
Grade A, and why
understanding-wpf-content-model 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 10d 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 — 234 lines — stays where its author put it; the contents beside it link to each section on GitHub.
WPF Content Model Patterns
WPF controls are classified into 4 main models based on how they contain content.
1. Content Model Hierarchy
Control
├── ContentControl (Single Content)
│ ├── Button
│ ├── Label
│ ├── CheckBox
│ ├── RadioButton
│ ├── ToolTip
│ ├── ScrollViewer
│ ├── UserControl
│ ├── Window
│ └── HeaderedContentControl (Content + Header)
│ ├── Expander
│ ├── GroupBox
│ └── TabItem
│
└── ItemsControl (Multiple Items)
├── ListBox
├── ComboBox
├── ListView
├── TreeView
├── Menu
├── TabControl
└── HeaderedItemsControl (Items + Header)
├── MenuItem
├── TreeViewItem
└── ToolBar
2. ContentControl
2.1 Characteristics
- Single Content property: Holds only one child element
- Content type: object (allows all types)
- ContentTemplate: Specifies how Content is rendered
2.2 Basic Usage
<!-- String content -->
<Button Content="Click Me"/>
<!-- Complex content -->
<Button>
<StackPanel Orientation="Horizontal">
<Image Source="/icon.png" Width="16"/>
<TextBlock Text="Save" Margin="5,0,0,0"/>
</StackPanel>
</Button>
2.3 Using ContentTemplate
<Button Content="Download">
<Button.ContentTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Path Data="M12,2L12,14L8,10L12,14L16,10L12,14"
Fill="White" Width="16"/>
<TextBlock Text="{Binding}" Margin="5,0,0,0"/>
</StackPanel>
</DataTemplate>
</Button.ContentTemplate>
</Button>
Advanced: See ADVANCED.md for creating custom ContentControl, ItemsControl, HeaderedContentControl-derived controls, custom ItemsPanel, and HierarchicalDataTemplate.
3. ItemsControl
3.1 Characteristics
- Items collection: Holds multiple child elements
- ItemsSource: Source for data binding
- ItemTemplate: Rendering method for each item
- ItemsPanel: Specifies the panel for item layout
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.
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.
- 10d ago First seen · 234 lines · 33 tokens per session scan A 54741dbdc9ad
understanding-wpf-content-model is a skill published in the GitHub repository christian289/dotnet-with-claudecode (41 stars, last pushed 1mo ago), licensed MIT. It adds 33 tokens to every session and 1,466 once invoked, about $0.0002 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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