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USE FOR: separate Linux GTK4 head projects, `maui-linux-gtk4`, `maui-macos`, or `maui-wpf` templates, net10 desktop setup, `UseMauiAppLinuxGtk4` or related SDK hooks, AppKit instead of Mac Catalyst, and parity planning. DO NOT USE FOR: implementing backends, handlers, or Essentials services.\n---\n\n# MAUI Labs Platform Targeting\n\nUse this skill when an app developer wants to run a MAUI app on experimental\nMAUI Labs backends such as Linux GTK4, native macOS AppKit, or WPF. This is for\nconsuming backends, not implementing them.\n\n## Response Checklist\n\n- Keep backend terms explicit: `maui-linux-gtk4`, `maui-macos`, `maui-wpf`.\n- Show the hosting call for the selected backend (`UseMauiAppLinuxGtk4`,\n  `UseMauiAppMacOS`, or `UseMauiAppWPF`).\n- Distinguish AppKit (`MACOS`) from Mac Catalyst and call out experimental parity\n  validation.\n\n## Workflow\n\n1. Confirm the app target: Linux GTK4, macOS AppKit, WPF, or a comparison between\n   those experimental backends.\n2. Choose the template\u002Fhead-project pattern for that backend before editing app\n   code.\n3. Wire the backend-specific hosting call and optional Essentials package.\n4. Audit shared code for platform conditionals and unsupported Essentials APIs.\n5. Build and launch the selected backend, then record experimental parity gaps.\n\n## Platform Choices\n\n| Target | When to choose it | Key package\u002Ftemplate |\n| --- | --- | --- |\n| Linux GTK4 | Native Linux desktop app using GTK4 widgets | `Microsoft.Maui.Platforms.Linux.Gtk4` \u002F `maui-linux-gtk4` |\n| macOS AppKit | Native AppKit app instead of Mac Catalyst | `Microsoft.Maui.Platforms.MacOS` \u002F `maui-macos` |\n| WPF | Windows desktop app using WPF instead of WinUI | `Microsoft.Maui.Platforms.Windows.WPF` \u002F `maui-wpf` |\n\nThese backends are experimental. Ask the user which controls, Essentials APIs,\nand desktop integrations are required before promising parity.\n\n## Linux GTK4\n\nLinux uses a separate head project because there is no official `net10.0-linux`\nMAUI TFM.\n\nUbuntu\u002FDebian:\n\n```bash\nsudo apt install libgtk-4-dev libwebkitgtk-6.0-dev \\\n  gobject-introspection libgirepository1.0-dev \\\n  gir1.2-gtk-4.0 gir1.2-webkit-6.0 pkg-config\n```\n\nAdjust package names for other distributions, for example Fedora\u002FRHEL commonly\nuse `gtk4-devel` and `webkitgtk6.0-devel`.\n\n```bash\ndotnet new install Microsoft.Maui.Platforms.Linux.Gtk4.Templates --prerelease\ndotnet new maui-linux-gtk4 -n MyApp.Linux\ndotnet run --project MyApp.Linux\n```\n\nFor an existing app, create `MyApp.Linux` next to the shared MAUI project and\nreference the shared app\u002Fproject. Pin concrete package versions for production;\nthe version below is a placeholder to replace with the selected prerelease:\n\n```xml\n\u003CProjectReference Include=\"..\u002FMyApp\u002FMyApp.csproj\" \u002F>\n\u003CPackageReference Include=\"Microsoft.Maui.Platforms.Linux.Gtk4\" Version=\"0.6.0-preview.1\" \u002F>\n\u003CPackageReference Include=\"Microsoft.Maui.Platforms.Linux.Gtk4.Essentials\" Version=\"0.6.0-preview.1\" \u002F>\n```\n\n```csharp\nbuilder\n    .UseMauiAppLinuxGtk4\u003CApp>()\n    .AddLinuxGtk4Essentials();\n```\n\nIf the app does not need Linux Essentials services, omit the Essentials package\nand `AddLinuxGtk4Essentials()` call.\n\n## macOS AppKit\n\nUse this when the app should be a native AppKit app, not Mac Catalyst.\n\n```bash\ndotnet new install Microsoft.Maui.Platforms.MacOS.Templates --prerelease\ndotnet new maui-macos -n MyApp.MacOS\ndotnet run --project MyApp.MacOS\n```\n\nManual projects target `net10.0-macos`, reference the AppKit backend packages,\nand call:\n\n```csharp\nbuilder\n    .UseMauiAppMacOS\u003CApp>()\n    .AddMacOSEssentials();\n```\n\nAppKit has different UI conventions and APIs than Mac Catalyst. Do not reuse\nUIKit-specific `IOS || MACCATALYST` code for AppKit without a separate `MACOS`\npath.\n\n## WPF\n\nUse WPF when the app needs WPF hosting or desktop integration instead of WinUI:\n\n```bash\ndotnet new install Microsoft.Maui.Platforms.Windows.WPF.Templates --prerelease\ndotnet new maui-wpf -n MyApp.WPF\ndotnet run --project MyApp.WPF\n```\n\nManual projects target `net10.0-windows`, set both `UseWPF` and `UseMaui`,\nreference the WPF backend packages, and call:\n\n```csharp\nbuilder\n    .UseMauiAppWPF\u003CApp>()\n    .UseWPFEssentials();\n```\n\n## App Adaptation Checklist\n\n- Factor shared UI, view models, services, and resources so experimental head\n  projects can reuse them.\n- Audit platform-specific code for `ANDROID`, `IOS`, `MACCATALYST`, `WINDOWS`,\n  and `MACOS` assumptions. Add separate paths for AppKit, WPF, or GTK where\n  behavior differs.\n- Check Essentials coverage for the target backend. Some desktop APIs are\n  partial or intentionally stubbed.\n- Test pointer, keyboard, window sizing, menu, file picker, secure storage,\n  clipboard, and WebView\u002FBlazor Hybrid behavior if the app depends on them.\n- Use DevFlow where available to inspect visual tree, screenshots, and controls.\n\n## Do Not Confuse With Backend Implementation\n\nIf the task is to add a handler, implement an Essentials API, scaffold backend\nsource, or debug renderer internals in `platforms\u002F*`, use a platform-backend\nimplementation skill if one is available in your environment. 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Use when analyzing .NET code for optimization opportunities, reviewing hot paths, or auditing allocation-heavy patterns.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1184,1185,1188,1189],{"name":1061,"slug":1062,"type":15},{"name":1186,"slug":1187,"type":15},"Code Analysis","code-analysis",{"name":1094,"slug":1095,"type":15},{"name":1173,"slug":1174,"type":15},4576,"https:\u002F\u002Fgithub.com\u002Fdotnet\u002Fskills","2026-07-12T08:23:25.400375",{"slug":1194,"name":1194,"fn":1195,"description":1196,"org":1197,"tags":1198,"stars":1190,"repoUrl":1191,"updatedAt":1204},"android-tombstone-symbolication","symbolicate .NET runtime frames in Android tombstones","Symbolicate the .NET runtime frames in an Android tombstone file. Extracts BuildIds and PC offsets from the native backtrace, downloads debug symbols from the Microsoft symbol server, and runs llvm-symbolizer to produce function names with source file and line numbers. USE FOR triaging a .NET MAUI or Mono Android app crash from a tombstone, resolving native backtrace frames in libmonosgen-2.0.so or libcoreclr.so to .NET runtime source code, or investigating SIGABRT, SIGSEGV, or other native signals originating from the .NET runtime on Android. DO NOT USE FOR pure Java\u002FKotlin crashes, managed .NET exceptions that are already captured in logcat, or iOS crash logs. INVOKES Symbolicate-Tombstone.ps1 script, llvm-symbolizer, Microsoft symbol server.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1199,1200,1201,1202],{"name":1061,"slug":1062,"type":15},{"name":1064,"slug":32,"type":15},{"name":1094,"slug":1095,"type":15},{"name":1203,"slug":36,"type":15},"Microsoft","2026-07-12T08:23:21.595572",{"slug":1206,"name":1206,"fn":1207,"description":1208,"org":1209,"tags":1210,"stars":1190,"repoUrl":1191,"updatedAt":1218},"apple-crash-symbolication","symbolicate .NET runtime frames in crash logs","Symbolicate .NET runtime frames in Apple platform .ips crash logs (iOS, tvOS, Mac Catalyst, macOS). Extracts UUIDs and addresses from the native backtrace, locates dSYM debug symbols, and runs atos to produce function names with source file and line numbers. Automatically downloads .dwarf symbols from the Microsoft symbol server using Mach-O UUIDs. USE FOR triaging a .NET MAUI or Mono app crash from an .ips file on any Apple platform, resolving native backtrace frames in libcoreclr or libmonosgen-2.0 to .NET runtime source code, retrieving .ips crash logs from a connected iOS device or iPhone, or investigating EXC_CRASH, EXC_BAD_ACCESS, SIGABRT, or SIGSEGV originating from the .NET runtime. DO NOT USE FOR pure Swift\u002FObjective-C crashes with no .NET components, or Android tombstone files. INVOKES Symbolicate-Crash.ps1 script, atos, dwarfdump, idevicecrashreport.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1211,1212,1213,1214,1215],{"name":1061,"slug":1062,"type":15},{"name":1094,"slug":1095,"type":15},{"name":1125,"slug":33,"type":15},{"name":20,"slug":21,"type":15},{"name":1216,"slug":1217,"type":15},"Observability","observability","2026-07-12T08:23:20.369986",{"slug":1220,"name":1220,"fn":1221,"description":1222,"org":1223,"tags":1224,"stars":1190,"repoUrl":1191,"updatedAt":1232},"assertion-quality","evaluate assertion quality in test suites","Analyzes the variety and depth of assertions across test suites in any language. Use when the user asks to evaluate assertion quality, find shallow tests, identify assertion-free tests (no assertions or only trivial ones like Assert.IsNotNull \u002F toBeTruthy()), flag self-referential or tautological assertions, measure assertion diversity, or audit whether tests verify different facets of behavior. Polyglot: .NET, Python, TS\u002FJS, Java, Go, Ruby, Rust, Swift, Kotlin, PowerShell, C++. DO NOT USE FOR: writing new tests (use code-testing-agent \u002F writing-mstest-tests), mutation reasoning about whether tests would catch a bug (use test-gap-analysis), or a general severity-ranked anti-pattern audit (use test-anti-patterns), fixing or rewriting assertions, or writing, fixing, or modernizing MSTest tests, assertions, or attributes (use writing-mstest-tests).",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1225,1226,1229],{"name":1186,"slug":1187,"type":15},{"name":1227,"slug":1228,"type":15},"QA","qa",{"name":1230,"slug":1231,"type":15},"Testing","testing","2026-07-12T08:23:51.277743",{"slug":1234,"name":1234,"fn":1235,"description":1236,"org":1237,"tags":1238,"stars":1190,"repoUrl":1191,"updatedAt":1250},"author-component","create and review Blazor components","Create or review Blazor components (.razor files) with correct architecture. USE FOR: writing new Blazor components that do NOT involve JavaScript interop, implementing parameters and EventCallback, RenderFragment slots, component lifecycle (OnInitializedAsync, OnParametersSet), async patterns, IAsyncDisposable, CancellationToken, CSS isolation, code-behind. DO NOT USE FOR: creating new projects (use create-blazor-project), JavaScript interop or calling browser APIs from Blazor (use use-js-interop), forms and validation (use collect-user-input), prerendering issues (use support-prerendering), HTTP data fetching patterns (use fetch-and-send-data), coordinating state between unrelated components (use coordinate-components).\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1239,1240,1243,1244,1247],{"name":1061,"slug":1062,"type":15},{"name":1241,"slug":1242,"type":15},"Blazor","blazor",{"name":1108,"slug":572,"type":15},{"name":1245,"slug":1246,"type":15},"UI Components","ui-components",{"name":1248,"slug":1249,"type":15},"Web Development","web-development","2026-07-15T06:03:29.216359",{"slug":1252,"name":1252,"fn":1253,"description":1254,"org":1255,"tags":1256,"stars":1190,"repoUrl":1191,"updatedAt":1260},"binlog-failure-analysis","analyze MSBuild binary logs","Analyze MSBuild binary logs to diagnose build failures. USE FOR: build errors that are unclear from console output, diagnosing cascading failures across multi-project builds, tracing MSBuild target execution order, and generally any MSBuild build issues. Requires an existing .binlog file. DO NOT USE FOR: generating binlogs (use binlog-generation), non-MSBuild build systems.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1257,1258,1259],{"name":1186,"slug":1187,"type":15},{"name":1094,"slug":1095,"type":15},{"name":1203,"slug":36,"type":15},"2026-07-12T08:21:34.637923",{"slug":1262,"name":1262,"fn":1263,"description":1264,"org":1265,"tags":1266,"stars":1190,"repoUrl":1191,"updatedAt":1272},"binlog-generation","generate MSBuild binary logs for diagnostics","Generate MSBuild binary logs (binlogs) for build diagnostics and analysis. USE FOR: adding \u002Fbl:{} to any dotnet build, test, pack, publish, or restore command to capture a full build execution trace, prerequisite for binlog-failure-analysis and build-perf-diagnostics skills, enabling post-build investigation of errors or performance. Requires MSBuild 17.8+ \u002F .NET 8 SDK+ for {} placeholder; PowerShell needs -bl:{{}}. DO NOT USE FOR: non-MSBuild build systems (npm, Maven, CMake), analyzing an existing binlog (use binlog-failure-analysis instead).",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1267,1270,1271],{"name":1268,"slug":1269,"type":15},"Build","build",{"name":1094,"slug":1095,"type":15},{"name":1113,"slug":1114,"type":15},"2026-07-19T05:38:19.340791",{"slug":1274,"name":1274,"fn":1275,"description":1276,"org":1277,"tags":1278,"stars":1190,"repoUrl":1191,"updatedAt":1282},"build-parallelism","optimize MSBuild build parallelism","Diagnose and fix under-parallelized MSBuild builds. USE WHEN a multi-project solution build is slower than expected, doesn't speed up when you add cores, pegs a single core while others idle, or you want to know why `-m` isn't helping. Note: `\u002Fmaxcpucount` default is 1 (sequential) — always pass `-m` for parallel builds. Covers finding the critical path (longest serial ProjectReference chain), graph build (`\u002Fgraph`), BuildInParallel, and solution filters (`.slnf`). DO NOT USE FOR: single-project builds, incremental issues (use incremental-build), compilation slowness inside one project (use build-perf-diagnostics), non-MSBuild build systems.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1279,1280,1281],{"name":1061,"slug":1062,"type":15},{"name":1113,"slug":1114,"type":15},{"name":1173,"slug":1174,"type":15},"2026-07-19T05:38:18.364937",{"slug":1284,"name":1284,"fn":1285,"description":1286,"org":1287,"tags":1288,"stars":1190,"repoUrl":1191,"updatedAt":1295},"build-perf-baseline","establish and optimize build performance baselines","Establish build performance baselines and apply systematic optimization techniques. USE FOR: diagnosing slow builds, establishing before\u002Fafter measurements (cold, warm, no-op scenarios), applying optimization strategies like MSBuild Server, static graph builds, artifacts output, and dependency graph trimming. Start here before diving into build-perf-diagnostics, incremental-build, or build-parallelism. DO NOT USE FOR: non-MSBuild build systems, detailed bottleneck analysis (use build-perf-diagnostics after baselining).",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1289,1290,1293,1294],{"name":1113,"slug":1114,"type":15},{"name":1291,"slug":1292,"type":15},"Monitoring","monitoring",{"name":1173,"slug":1174,"type":15},{"name":1230,"slug":1231,"type":15},"2026-07-12T08:21:35.865649",{"slug":1297,"name":1297,"fn":1298,"description":1299,"org":1300,"tags":1301,"stars":1190,"repoUrl":1191,"updatedAt":1306},"build-perf-diagnostics","diagnose MSBuild build performance bottlenecks","Diagnose MSBuild build performance bottlenecks using binary log analysis. USE FOR: identifying why builds are slow by analyzing binlog performance summaries, detecting ResolveAssemblyReference (RAR) taking >5s, Roslyn analyzers consuming >30% of Csc time, single targets dominating >50% of build time, node utilization below 80%, excessive Copy tasks, NuGet restore running every build. Covers timeline analysis, Target\u002FTask Performance Summary interpretation, and 7 common bottleneck categories. Use after build-perf-baseline has established measurements. DO NOT USE FOR: establishing initial baselines (use build-perf-baseline first), fixing incremental build issues (use incremental-build), parallelism tuning (use build-parallelism), non-MSBuild build systems.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1302,1303,1304,1305],{"name":1061,"slug":1062,"type":15},{"name":1094,"slug":1095,"type":15},{"name":1113,"slug":1114,"type":15},{"name":1173,"slug":1174,"type":15},"2026-07-12T08:21:40.961722",{"slug":1308,"name":1308,"fn":1309,"description":1310,"org":1311,"tags":1312,"stars":1190,"repoUrl":1191,"updatedAt":1316},"check-bin-obj-clash","detect MSBuild output path conflicts","Detects MSBuild projects with conflicting OutputPath or IntermediateOutputPath. USE FOR: builds failing with 'Cannot create a file when that file already exists', 'The process cannot access the file because it is being used by another process', intermittent build failures that succeed on retry, or missing\u002Foverwritten outputs in multi-project or multi-targeting builds where bin\u002Fobj (or project.assets.json) collide. Common causes: shared OutputPath, missing AppendTargetFrameworkToOutputPath, extra global properties (e.g. PublishReadyToRun), or SetTargetFramework on a ProjectReference to a single-targeting project. DO NOT USE FOR: file access errors unrelated to MSBuild (OS-level locking), single-project single-TFM builds, non-MSBuild build systems.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1313,1314,1315],{"name":1094,"slug":1095,"type":15},{"name":1113,"slug":1114,"type":15},{"name":1227,"slug":1228,"type":15},"2026-07-19T05:38:14.336279",144]