Uno Platform is an open-source .NET development platform that lets developers build native mobile, web, desktop, and embedded applications from one C# and XAML codebase. It is intended for .NET developers who want to share application code across multiple operating systems and device types. The catalogue entries support development workflows for Uno Platform with skills, agents, commands, and instructions.
Borrowing it
Nothing to install: this file belongs to unoplatform/uno. 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/unoplatform/uno/master/.claude/skills/winui-runtime-tests/SKILL.mdgit clone --depth 1 https://github.com/unoplatform/unoWrote 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/unoplatform/uno/winui-runtime-tests)<a href="https://agentmods.dev/skills/unoplatform/uno/winui-runtime-tests"><img src="https://agentmods.dev/badge/skills/unoplatform/uno/winui-runtime-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/unoplatform/uno/winui-runtime-tests"><img src="https://agentmods.dev/badge/skills/unoplatform/uno/winui-runtime-tests.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, 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 Rogue Agent · line 35 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- medium Rogue Agent · line 327 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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 | $0.00035 | $0.04259 |
| Opus 5.5 | $0.00014 | $0.01704 |
| Sonnet 5.5 | $0.00007 | $0.00852 |
| Haiku 4.5 | $0.00003 | $0.00426 |
Grade A, and why
winui-runtime-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 25d 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 — 266 lines — stays where its author put it; the contents beside it link to each section on GitHub.
User Input
$ARGUMENTS
You MUST consider the user input before proceeding (if not empty).
Overview
You are executing the WinUI Runtime Tests Skill. It builds the WinAppSDK SamplesApp and runs runtime tests against native WinUI — the reference implementation Uno Platform targets.
The default path uses the Windows App Development CLI (winapp run): it registers the plain build output as a development (loose-layout) package and launches it. No MSIX packaging, no signing certificate, no admin elevation, no Add-AppxPackage. The app's console output streams straight to the terminal, and winapp waits for the app to exit.
An MSIX fallback remains for the rare cases that need a real package (see MSIX fallback path).
Requirements: Windows with Developer Mode enabled (loose-layout registration needs it), MSBuild (Visual Studio), and PowerShell (pwsh preferred). winapp.exe is bundled in the Microsoft.Windows.SDK.BuildTools.WinApp package the head already references, so run-tests.ps1 finds it even with nothing installed globally (winget install Microsoft.WinAppCli also works).
Helper scripts live beside this file (.claude/skills/winui-runtime-tests/):
| Script | Purpose |
|---|---|
build-app.ps1 |
Build the head (SDK pin + global.json swap + Graphics3DGL handled for you) |
run-tests.ps1 |
Register the build output via winapp and run the tests (default path) |
parse-results.ps1 |
Summarize the UTF-16 NUnit results, including Inconclusive |
cleanup.ps1 |
Remove the package (MSIX-installed or winapp-registered) |
dotnet-root.ps1 |
Dot-sourced by both runners — points DOTNET_ROOT_<ARCH> at the install holding the app's exact runtime in the app's architecture |
setup-cert.ps1 |
MSIX fallback only — generate + trust a signing certificate (admin, once) |
install-msix.ps1 |
MSIX fallback only — remove old package + install the built MSIX |
run-tests-msix.ps1 |
MSIX fallback only — launch via execution alias, poll for results |
What ships with it
8 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.
- 25d ago Changed · -182 lines 3363da06ef65
- 1mo ago Changed 7f5bbcf17202
- 1mo ago First seen · 448 lines · 35 tokens per session scan A 8c25e7b455e5
winui-runtime-tests is a skill published in the GitHub repository unoplatform/uno (10,079 stars, last pushed today), licensed Apache-2.0. It adds 35 tokens to every session and 4,259 once invoked, about $0.0001 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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