.NET MAUI is a C# and XAML framework for building native mobile and desktop applications from one shared codebase. Developers use it to create apps for Android, iOS, iPadOS, macOS, and Windows. The catalogue entries provide skills, instructions, and agents for working with .NET MAUI.
Borrowing it
Nothing to install: this file belongs to dotnet/maui. 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/dotnet/maui/main/.github/skills/write-xaml-tests/SKILL.mdgit clone --depth 1 https://github.com/dotnet/mauiWrote 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/dotnet/maui/write-xaml-tests)<a href="https://agentmods.dev/skills/dotnet/maui/write-xaml-tests"><img src="https://agentmods.dev/badge/skills/dotnet/maui/write-xaml-tests/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/dotnet/maui/write-xaml-tests"><img src="https://agentmods.dev/badge/skills/dotnet/maui/write-xaml-tests.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Snyk pass
- 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 | $0.00049 | $0.00742 |
| Opus 5.5 | $0.00020 | $0.00297 |
| Sonnet 5.5 | $0.00010 | $0.00148 |
| Haiku 4.5 | $0.00005 | $0.00074 |
Grade A, and why
write-xaml-tests 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.
How it starts
The opening of the file, as written. The whole thing — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Write XAML Tests Skill
Creates XAML unit tests that verify XAML parsing, XamlC compilation, and source generation behavior.
When to Use
- ✅ Testing XAML parsing/inflation behavior
- ✅ Testing XamlC (IL generation) correctness
- ✅ Testing Source Generator output
- ✅ XAML-specific bugs (bindings, markup extensions, x:Name, etc.)
When NOT to Use
- ❌ Testing UI interactions or visual behavior → Use
write-ui-testsskill - ❌ Testing runtime behavior after page loads → Use
write-ui-testsskill - ❌ Testing platform-specific rendering → Use
write-ui-testsskill
Required Input
Before invoking, ensure you have:
- Issue number (e.g., 12345)
- Issue description - what XAML behavior is broken
- Expected vs actual behavior
Workflow
Step 1: Read the XAML Unit Test Guidelines
cat .github/instructions/xaml-unittests.instructions.md
This contains the authoritative conventions for:
- File naming (
MauiXXXXX.xamlandMauiXXXXX.xaml.cs) - File location (
src/Controls/tests/Xaml.UnitTests/Issues/) - Test patterns with
[Values] XamlInflator - XamlC testing with
MockCompiler - Source Generator testing with
MockSourceGenerator - Special file extensions for invalid codegen (
.rt.xaml,.rtsg.xaml,.rtxc.xaml)
Step 2: Create Test Files
Following the conventions from Step 1, create:
src/Controls/tests/Xaml.UnitTests/Issues/MauiXXXXX.xamlsrc/Controls/tests/Xaml.UnitTests/Issues/MauiXXXXX.xaml.cs
Step 3: Verify Tests Compile and Run
# Build the test project
dotnet build src/Controls/tests/Xaml.UnitTests/Controls.Xaml.UnitTests.csproj -c Debug --no-restore -v q
# Run specific test
dotnet test src/Controls/tests/Xaml.UnitTests/Controls.Xaml.UnitTests.csproj --filter "FullyQualifiedName~MauiXXXXX" --no-build
Step 4: Verify Test Behavior
- For bug reproduction tests: Tests should FAIL before fix, PASS after fix
- For regression tests: Tests should PASS to confirm behavior works
Output
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 · 92 lines · 49 tokens per session scan A d7ba42ad1533
write-xaml-tests is a skill published in the GitHub repository dotnet/maui (23,322 stars, last pushed today), licensed MIT. It adds 49 tokens to every session and 742 once invoked, about $0.0002 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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Use this to update the Github Copilot CLI/SDK.
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build-sample-matrix
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translate-a-sample
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update-changelog
Update the CHANGELOG.md files of C# projects. Parameters: csroot C# SDK repository root.