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USE FOR: audits, fresh `dotnet new maui`, `Xamarin.Forms`\u002F`Xamarin.Essentials` namespace updates, `DependencyService` to DI, `MessagingCenter` to WeakReferenceMessenger\u002Fevents, renderer triage into mapper\u002Fcustom handler\u002Fplatform service\u002Fslim binding, `MauiProgram`, permissions, parity. DO NOT USE FOR: brand-new MAUI apps, native SDK bindings, backend.\n---\n\n# Xamarin.Forms Migration\n\nUse this skill to move a Xamarin.Forms app to .NET MAUI without blindly copying\nobsolete patterns. Treat migration as an audit and phased rebuild on a fresh\nMAUI project unless the user explicitly needs a small tactical port.\n\n## Response Checklist\n\n- Call out the migration audit first (`DependencyService`, `MessagingCenter`,\n  custom renderers\u002Feffects, permissions, and platform capabilities).\n- Prefer a fresh MAUI project workflow and `MauiProgram.cs` DI setup.\n- Explicitly classify renderer replacements into mapper customization, custom\n  handler, platform service, or slim binding.\n\n## Migration Tooling\n\nBefore migrating manually, check whether the .NET Upgrade Assistant can cover\nthe mechanical parts of the app:\n\n```bash\ndotnet tool install -g upgrade-assistant\nupgrade-assistant upgrade \u003Cyour-solution>.sln\n```\n\nUpgrade Assistant can help with project conversion and namespace\u002FAPI rewrites.\nUse this skill for decisions tooling cannot safely automate: renderer\nclassification, `DependencyService` lifetimes, `MessagingCenter` replacement,\nplatform capability parity, and validation planning.\n\n## Migration Workflow\n\n1. Inventory the current app:\n   - Xamarin.Forms version, target platforms, platform projects, NuGet packages,\n     renderers, effects, `DependencyService`, `MessagingCenter`, and native SDKs.\n   - App startup, navigation, resource dictionaries, images\u002Ffonts, and platform\n     entitlements\u002Fpermissions.\n2. Create a new .NET MAUI project or solution structure that matches the target\n   app shape. Prefer this over editing the Xamarin.Forms project in place.\n3. Move shared code first: models, services, view models, converters, resources,\n   and XAML. Keep platform code out until shared code builds.\n4. Update namespaces and APIs using `maui-current-apis`; do not introduce new\n   `Xamarin.Forms` or `Xamarin.Essentials` references.\n5. Migrate app startup to `MauiProgram.cs`, `CreateMauiApp`, DI registration,\n   fonts, handlers, lifecycle events, and platform services.\n6. Migrate UI and navigation incrementally. Keep Shell route names, modal flows,\n   and deep-link behavior explicit.\n7. Plan custom renderer\u002Feffect replacements:\n   - simple native property tweak -> handler mapper customization;\n   - reusable custom control -> custom handler;\n   - non-visual platform API -> platform service via DI;\n   - third-party native SDK surface -> slim binding.\n8. Validate each migrated slice with build, platform launch, and accessibility or\n   performance checks for changed UI.\n\n## Common API Replacements\n\n| Xamarin.Forms-era pattern | MAUI direction |\n| --- | --- |\n| `using Xamarin.Forms` | `using Microsoft.Maui.Controls` |\n| `using Xamarin.Essentials` | `Microsoft.Maui.ApplicationModel`, `Microsoft.Maui.Devices`, `Microsoft.Maui.Storage`, or the specific MAUI namespace |\n| `Device.BeginInvokeOnMainThread` | `MainThread.BeginInvokeOnMainThread` or `Dispatcher.Dispatch` |\n| `Device.StartTimer` | `Dispatcher.StartTimer` or `IDispatcherTimer` |\n| `Device.RuntimePlatform` | `DeviceInfo.Platform`, `OnPlatform`, partial classes, or DI services |\n| `Color.Red`, `Color.FromHex` | `Colors.Red`, `Color.FromArgb`, or resource colors |\n| `Application.Current.MainPage = ...` | `Window.Page` for intentional resets, or Shell\u002Fnavigation abstractions for routine navigation |\n| `DependencyService.Get\u003CT>()` | Constructor-injected services registered in `MauiProgram.cs` |\n| `MessagingCenter` | `WeakReferenceMessenger`, events, observable state, or explicit domain services |\n| `ExportRenderer` \u002F `CustomRenderer` | Handler mapper customization or `ViewHandler\u003CTVirtualView,TPlatformView>` |\n\n## DependencyService to DI\n\n1. Move the cross-platform contract to shared code:\n\n   ```csharp\n   public interface IClipboardAuditService\n   {\n       Task TrackCopyAsync(string source, CancellationToken cancellationToken = default);\n   }\n   ```\n\n2. Implement each platform in `Platforms\u002F\u003CPlatform>\u002F` or target-specific files.\n3. Register the implementation in `MauiProgram.cs` with `AddSingleton`,\n   `AddScoped`, or `AddTransient` based on lifetime needs.\n4. Inject the service into view models or services. Avoid service locator calls\n   from pages unless the app already uses that pattern and you are containing\n   migration risk.\n\n## MessagingCenter Replacement\n\nChoose the smallest explicit communication pattern:\n\n| Existing use | Replacement |\n| --- | --- |\n| View model updates a bound page | Observable properties and binding |\n| Domain event across features | `WeakReferenceMessenger` or an app event aggregator |\n| One service asks another to work | Inject the target service and call a method |\n| Navigation trigger | Navigation service or Shell route call |\n| Platform callback | Platform service event or `IObservable\u003CT>` exposed through DI |\n\nDo not migrate `MessagingCenter` by adding global static events everywhere.\nDocument message names, payload types, sender\u002Freceiver lifetimes, and threading\nbefore replacing them.\n\n## Renderer to Handler Planning\n\nAudit each renderer and classify it before writing code:\n\n| Renderer shape | MAUI migration |\n| --- | --- |\n| Changes one native property on an existing MAUI control | `Handler.Mapper.AppendToMapping` scoped to a subclass or named mapping |\n| Needs a cross-platform custom control with bindable properties | Custom handler with `PropertyMapper` and optional `CommandMapper` |\n| Subscribes to native events | Handler `ConnectHandler`\u002F`DisconnectHandler` with explicit unsubscribe cleanup |\n| Calls camera, health, maps, payment, or other SDK APIs | Platform service or slim binding; do not hide SDK workflow in a visual handler |\n| Uses Xamarin.Forms effects only for styling | Prefer styles, visual states, or a handler mapper |\n\n## Platform Capability Parity\n\nFor each target platform, record:\n\n- required permissions, entitlements, manifests, Info.plist keys, and app\n  capabilities;\n- Essentials API coverage and behavioral differences;\n- native SDK availability and version requirements;\n- background tasks, push\u002Fdeep link, secure storage, file picker, and biometric\n  differences;\n- UI parity risks such as safe areas, keyboard\u002Fsoft input, gestures, and desktop\n  pointer behavior.\n\n## Cross-Skill Routing\n\n- Use `maui-current-apis` for version-specific MAUI API replacements.\n- Use `maui-custom-handlers` for handler mapper\u002Fcustom handler implementation.\n- Use `maui-platform-invoke` for non-visual platform services, partial classes,\n  permissions, and lifecycle hooks.\n- Use `android-slim-bindings` or `ios-slim-bindings` when a native SDK needs a\n  maintainable binding surface.\n- Use `maui-accessibility` and `maui-performance` for migrated UI risk areas.\n\n## Validation Checklist\n\n- The migration plan starts from an audited Xamarin.Forms solution, not guesses.\n- New code targets MAUI namespaces and current APIs.\n- Platform capabilities and permissions are mapped for every retained platform.\n- Renderers\u002Feffects are classified before migration.\n- `DependencyService` and `MessagingCenter` replacements have explicit lifetimes.\n- Each migrated slice builds and runs on at least one intended platform.\n",{"data":47,"body":48},{"name":4,"description":6},{"type":49,"children":50},"root",[51,60,66,73,118,124,129,213,232,238,369,375,682,688,793,799,804,904,916,922,927,1050,1056,1061,1089,1095,1173,1179,1223],{"type":52,"tag":53,"props":54,"children":56},"element","h1",{"id":55},"xamarinforms-migration",[57],{"type":58,"value":59},"text","Xamarin.Forms Migration",{"type":52,"tag":61,"props":62,"children":63},"p",{},[64],{"type":58,"value":65},"Use this skill to move a Xamarin.Forms app to .NET MAUI without blindly copying\nobsolete patterns. 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USE FOR: accessibility audits, WCAG UI fixes, TalkBack\u002FVoiceOver\u002FNarrator behavior, SemanticProperties.Description\u002FHint\u002FHeadingLevel, SemanticScreenReader.Announce, SetSemanticFocus, avoiding redundant Label metadata, hiding decorative content with IsInAccessibleTree=false, and CollectionView row semantics. DO NOT USE FOR: general layout, UI automation only, or performance tuning.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1311,1312,1315,1316,1317],{"name":17,"slug":18,"type":15},{"name":1313,"slug":1314,"type":15},"Accessibility","accessibility",{"name":13,"slug":14,"type":15},{"name":20,"slug":21,"type":15},{"name":1318,"slug":1319,"type":15},"WCAG","wcag","2026-07-12T08:22:17.823583",{"slug":1322,"name":1322,"fn":1323,"description":1324,"org":1325,"tags":1326,"stars":25,"repoUrl":26,"updatedAt":1331},"maui-ai-debugging","debug .NET MAUI application issues","Legacy DevFlow debug skill. USE FOR: `maui-ai-debugging`, `maui devflow`, screenshots, visual tree, Blazor CDP, simulator\u002Femulator debugging. DO NOT USE FOR: setup, desktop automation, AppleScript, host `xdotool`.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1327,1328,1329,1330],{"name":17,"slug":18,"type":15},{"name":1267,"slug":1268,"type":15},{"name":13,"slug":14,"type":15},{"name":20,"slug":21,"type":15},"2026-07-12T08:22:52.634889",32,{"items":1334,"total":1490},[1335,1349,1364,1376,1392,1406,1424,1434,1446,1456,1469,1480],{"slug":1336,"name":1336,"fn":1337,"description":1338,"org":1339,"tags":1340,"stars":1346,"repoUrl":1347,"updatedAt":1348},"multithreaded-task-migration","migrate MSBuild tasks to multithreaded mode","Guide for migrating MSBuild tasks to multithreaded mode support, including compatibility red-team review. Use this when converting tasks to thread-safe versions, implementing IMultiThreadableTask, adding TaskEnvironment support, or auditing migrations for behavioral compatibility.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1341,1342,1343],{"name":17,"slug":18,"type":15},{"name":1286,"slug":1287,"type":15},{"name":1344,"slug":1345,"type":15},"Performance","performance",5535,"https:\u002F\u002Fgithub.com\u002Fdotnet\u002Fmsbuild","2026-07-22T05:37:33.965588",{"slug":1350,"name":1350,"fn":1351,"description":1352,"org":1353,"tags":1354,"stars":1361,"repoUrl":1362,"updatedAt":1363},"analyzing-dotnet-performance","analyze .NET code for performance anti-patterns","Scans .NET code for ~50 performance anti-patterns across async, memory, strings, collections, LINQ, regex, serialization, and I\u002FO with tiered severity classification. Use when analyzing .NET code for optimization opportunities, reviewing hot paths, or auditing allocation-heavy patterns.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1355,1356,1359,1360],{"name":17,"slug":18,"type":15},{"name":1357,"slug":1358,"type":15},"Code Analysis","code-analysis",{"name":1267,"slug":1268,"type":15},{"name":1344,"slug":1345,"type":15},4576,"https:\u002F\u002Fgithub.com\u002Fdotnet\u002Fskills","2026-07-12T08:23:25.400375",{"slug":1365,"name":1365,"fn":1366,"description":1367,"org":1368,"tags":1369,"stars":1361,"repoUrl":1362,"updatedAt":1375},"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},[1370,1371,1372,1373],{"name":17,"slug":18,"type":15},{"name":1238,"slug":32,"type":15},{"name":1267,"slug":1268,"type":15},{"name":1374,"slug":37,"type":15},"Microsoft","2026-07-12T08:23:21.595572",{"slug":1377,"name":1377,"fn":1378,"description":1379,"org":1380,"tags":1381,"stars":1361,"repoUrl":1362,"updatedAt":1391},"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},[1382,1383,1384,1385,1388],{"name":17,"slug":18,"type":15},{"name":1267,"slug":1268,"type":15},{"name":1297,"slug":34,"type":15},{"name":1386,"slug":1387,"type":15},"macOS","macos",{"name":1389,"slug":1390,"type":15},"Observability","observability","2026-07-12T08:23:20.369986",{"slug":1393,"name":1393,"fn":1394,"description":1395,"org":1396,"tags":1397,"stars":1361,"repoUrl":1362,"updatedAt":1405},"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},[1398,1399,1402],{"name":1357,"slug":1358,"type":15},{"name":1400,"slug":1401,"type":15},"QA","qa",{"name":1403,"slug":1404,"type":15},"Testing","testing","2026-07-12T08:23:51.277743",{"slug":1407,"name":1407,"fn":1408,"description":1409,"org":1410,"tags":1411,"stars":1361,"repoUrl":1362,"updatedAt":1423},"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},[1412,1413,1416,1417,1420],{"name":17,"slug":18,"type":15},{"name":1414,"slug":1415,"type":15},"Blazor","blazor",{"name":1281,"slug":700,"type":15},{"name":1418,"slug":1419,"type":15},"UI Components","ui-components",{"name":1421,"slug":1422,"type":15},"Web Development","web-development","2026-07-15T06:03:29.216359",{"slug":1425,"name":1425,"fn":1426,"description":1427,"org":1428,"tags":1429,"stars":1361,"repoUrl":1362,"updatedAt":1433},"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},[1430,1431,1432],{"name":1357,"slug":1358,"type":15},{"name":1267,"slug":1268,"type":15},{"name":1374,"slug":37,"type":15},"2026-07-12T08:21:34.637923",{"slug":1435,"name":1435,"fn":1436,"description":1437,"org":1438,"tags":1439,"stars":1361,"repoUrl":1362,"updatedAt":1445},"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},[1440,1443,1444],{"name":1441,"slug":1442,"type":15},"Build","build",{"name":1267,"slug":1268,"type":15},{"name":1286,"slug":1287,"type":15},"2026-07-19T05:38:19.340791",{"slug":1447,"name":1447,"fn":1448,"description":1449,"org":1450,"tags":1451,"stars":1361,"repoUrl":1362,"updatedAt":1455},"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},[1452,1453,1454],{"name":17,"slug":18,"type":15},{"name":1286,"slug":1287,"type":15},{"name":1344,"slug":1345,"type":15},"2026-07-19T05:38:18.364937",{"slug":1457,"name":1457,"fn":1458,"description":1459,"org":1460,"tags":1461,"stars":1361,"repoUrl":1362,"updatedAt":1468},"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},[1462,1463,1466,1467],{"name":1286,"slug":1287,"type":15},{"name":1464,"slug":1465,"type":15},"Monitoring","monitoring",{"name":1344,"slug":1345,"type":15},{"name":1403,"slug":1404,"type":15},"2026-07-12T08:21:35.865649",{"slug":1470,"name":1470,"fn":1471,"description":1472,"org":1473,"tags":1474,"stars":1361,"repoUrl":1362,"updatedAt":1479},"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},[1475,1476,1477,1478],{"name":17,"slug":18,"type":15},{"name":1267,"slug":1268,"type":15},{"name":1286,"slug":1287,"type":15},{"name":1344,"slug":1345,"type":15},"2026-07-12T08:21:40.961722",{"slug":1481,"name":1481,"fn":1482,"description":1483,"org":1484,"tags":1485,"stars":1361,"repoUrl":1362,"updatedAt":1489},"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},[1486,1487,1488],{"name":1267,"slug":1268,"type":15},{"name":1286,"slug":1287,"type":15},{"name":1400,"slug":1401,"type":15},"2026-07-19T05:38:14.336279",144]