.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-ui-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-ui-tests)<a href="https://agentmods.dev/skills/dotnet/maui/write-ui-tests"><img src="https://agentmods.dev/badge/skills/dotnet/maui/write-ui-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-ui-tests"><img src="https://agentmods.dev/badge/skills/dotnet/maui/write-ui-tests.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Snyk warn
- 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 | $0.00048 | $0.02882 |
| Opus 5.5 | $0.00019 | $0.01153 |
| Sonnet 5.5 | $0.00010 | $0.00576 |
| Haiku 4.5 | $0.00005 | $0.00288 |
Grade A, and why
write-ui-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 — 326 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Write UI Tests Skill
Creates UI tests that reproduce a GitHub issue, following .NET MAUI conventions. Verifies the tests actually fail before completing.
🛑 BLOCKING REQUIREMENT
YOU CANNOT COMPLETE THIS SKILL UNTIL TESTS FAIL.
A test that passes does NOT prove it catches the bug. You MUST:
- Run tests and observe them FAIL
- If tests pass, iterate on test code until they fail
- Never report "done" with passing tests
If tests keep passing after 3 iterations:
- STOP and ask user: "Tests are passing but they should fail to prove they catch the bug. The test scenario may not correctly reproduce the issue. Should I try a different approach?"
Common mistakes that lead to passing tests:
- Test scenario doesn't match issue reproduction steps
- Checking wrong element or property
- Bug only manifests on specific platform (try different platform)
- Bug requires specific timing or async behavior not captured
- Issue description is incomplete - may need to ask user for clarification
When to Use
- ✅ PR has no tests and needs them
- ✅ Issue needs a reproduction test before fixing
- ✅ Existing tests don't adequately cover the bug
Required Input
Before invoking, ensure you have:
- Issue number (e.g., 33331)
- Issue description or reproduction steps
- Platforms affected (iOS, Android, Windows, MacCatalyst)
Platform selection guidance:
- Start with the platform mentioned in the issue (often in title or labels)
- If issue says "iOS" or has
platform/iOSlabel → test on iOS first - If issue says "Android" or has
platform/Androidlabel → test on Android first - If issue affects "All" platforms → start with Android (faster emulator boot)
- If test passes on one platform, try another before concluding test is wrong
Workflow
Step 1: Read the UI Test Guidelines
cat .github/instructions/uitests.instructions.md
This contains the authoritative conventions for:
- File naming (
IssueXXXXX.csfor C#-only, orIssueXXXXX.xaml/.xaml.csfor XAML) - File locations (
TestCases.HostApp/Issues/,TestCases.Shared.Tests/Tests/Issues/) - Required attributes (
[Issue()],[Category()]) - Test patterns and assertions
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 · 326 lines · 48 tokens per session scan A 5ecf3539acb1
write-ui-tests is a skill published in the GitHub repository dotnet/maui (23,322 stars, last pushed today), licensed MIT. It adds 48 tokens to every session and 2,882 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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generate-code-cs
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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.
budget-checker
Validates that a proposed trip fits within the user's stated budget.