Borrowing it
Nothing to install: this file belongs to Devolutions/avalonia-extensions. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Devolutions/avalonia-extensions/master/.github/skills/winui-control-theming/SKILL.mdgit clone --depth 1 https://github.com/Devolutions/avalonia-extensionsWrote 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/devolutions/avalonia-extensions/winui-control-theming)<a href="https://agentmods.dev/skills/devolutions/avalonia-extensions/winui-control-theming"><img src="https://agentmods.dev/badge/skills/devolutions/avalonia-extensions/winui-control-theming/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/devolutions/avalonia-extensions/winui-control-theming"><img src="https://agentmods.dev/badge/skills/devolutions/avalonia-extensions/winui-control-theming.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 | $0.00071 | $0.03698 |
| Opus 5.5 | $0.00028 | $0.01479 |
| Sonnet 5.5 | $0.00014 | $0.00740 |
| Haiku 4.5 | $0.00007 | $0.00370 |
Grade A, and why
winui-control-theming 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 28d 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 — 291 lines — stays where its author put it; the contents beside it link to each section on GitHub.
WinUI Control Theming
Use this skill when working on src/Devolutions.AvaloniaTheme.WinUI/ and the goal is to add or refine WinUI-styled control themes while staying consistent with the resource strategy already used for this theme.
Core Principle
Prefer official WinUI resource names over made-up local names whenever they can be identified from WinUI source or docs.
This theme should follow the WinUI model as closely as practical:
- Shared WinUI semantic tokens go in
Accents/ThemeResources.axaml - Control-specific WinUI resources go in the relevant file under
Controls/ - New local resource names should be introduced only when no real WinUI equivalent exists
Why
Avalonia's Fluent theme is a Fluent-looking base theme, but its resource surface does not always match the newer WinUI token vocabulary. For this theme, the goal is not just to make controls "look good"; it is to make them look WinUI-like using WinUI concepts and names where possible.
That keeps future control work consistent:
- later controls can reuse the same token set
- resource names stay recognizable to people familiar with WinUI
- ad-hoc local naming does not spread across the theme
Required Workflow
When adding or updating a WinUI control theme:
-
Start from the WinUI control
- Find the WinUI default template and the theme resources it uses.
- Extract the actual resource names referenced by the template.
-
Separate shared tokens from control-specific resources
- Examples of shared tokens:
TextFillColorPrimaryBrush,AccentFillColorDefaultBrush,ControlFillColorDefaultBrush - Examples of control resources:
ButtonBackground,ButtonForegroundPointerOver,ButtonBorderBrushPressed
- Examples of shared tokens:
-
Compare against Avalonia Fluent
- Check the existing Avalonia Fluent control template and resource model.
- Decide whether the control can be adapted with targeted overrides or needs a fuller template port.
-
Port only what is needed
- Do not dump the full WinUI token set into
ThemeResources.axaml. - Add only the resources that are actually referenced by the new or updated control theme, unless there is a clear near-term reason to add a small shared set together.
- Do not dump the full WinUI token set into
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.
- 28d ago Changed · +54 lines 8c22f0b2d469
- 1mo ago Changed · +24 lines 5a458bcdd7cf
- 1mo ago Changed · +42 lines db8708ff7f07
- 2mo ago First seen · 171 lines · 71 tokens per session scan A 5840daa3a161
winui-control-theming is a skill published in the GitHub repository Devolutions/avalonia-extensions (84 stars, last pushed 15d ago), licensed MIT. It adds 71 tokens to every session and 3,698 once invoked, about $0.0003 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.
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