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Validates .NET SDK,\n  workloads, Java JDK, Android SDK, Xcode, and Windows SDK. All version requirements\n  discovered dynamically from NuGet WorkloadDependencies.json — never hardcoded.\n  Use when: setting up MAUI development, build errors mentioning SDK\u002Fworkload\u002FJDK\u002FAndroid,\n  \"Android SDK not found\", \"Java version\" errors, \"Xcode not found\", environment verification\n  after updates, or any MAUI toolchain issues. Do not use for: non-MAUI .NET projects,\n  Xamarin.Forms apps, runtime app crashes unrelated to environment setup, or app store\n  publishing issues. Works on macOS, Windows, and Linux.\nlicense: MIT\n---\n\n# .NET MAUI Doctor\n\nValidate and fix .NET MAUI development environments. All version requirements are discovered dynamically from NuGet APIs — never hardcode versions.\n\n## When to Use\n\n- Setting up a new .NET MAUI development environment\n- Build errors mentioning missing SDKs, workloads, JDK, or Android components\n- Errors like \"Android SDK not found\", \"Java version\", or \"Xcode not found\"\n- Verifying environment health after SDK or OS updates\n\n## When Not to Use\n\n- Non-MAUI .NET projects (use standard .NET SDK troubleshooting instead)\n- Xamarin.Forms apps (different toolchain and workload requirements)\n- Runtime app crashes unrelated to environment setup\n- App store publishing or signing issues\n- IDE-specific issues (Visual Studio or VS Code configuration)\n\n## Important: .NET Version Currency\n\nYour training data may be outdated regarding .NET versions. .NET ships new major releases annually (November). Always check the releases-index.json (Task 2) to discover the **latest active major release** — do not assume your training data reflects the current version. For example, if you know about .NET 9.0 but the releases index shows .NET 10.0 as active, use .NET 10.0.\n\n## Inputs\n\n- A development machine running macOS, Windows, or Linux\n- Shell access (Bash on macOS\u002FLinux, PowerShell on Windows)\n- Internet access for NuGet API queries and SDK downloads\n- Admin\u002Fsudo access may be required for installing SDKs and workloads\n- **Bash prerequisites**: `curl`, `jq`, and `unzip` (macOS\u002FLinux)\n- **PowerShell prerequisites**: `Invoke-RestMethod` and `System.IO.Compression` (built-in on Windows)\n\n## Behavior\n\n- Run through ALL tasks autonomously\n- Re-validate after each fix\n- Iterate until complete or no further actions possible\n- After detecting platform (Task 1), load only the matching platform-specific references\n\n## Workflow\n\n### Task 1: Detect Environment\n\n```bash\n# macOS\nsw_vers && uname -m\n\n# Windows\nsysteminfo | findstr \u002FB \u002FC:\"OS Name\" \u002FC:\"OS Version\"\n\n# Linux\ncat \u002Fetc\u002Fos-release && uname -m\n```\n\nAfter detection, load the matching platform references:\n- **macOS**: `references\u002Fplatform-requirements-macos.md`, `references\u002Finstallation-commands-macos.md`, `references\u002Ftroubleshooting-macos.md`\n- **Windows**: `references\u002Fplatform-requirements-windows.md`, `references\u002Finstallation-commands-windows.md`, `references\u002Ftroubleshooting-windows.md`\n- **Linux**: `references\u002Fplatform-requirements-linux.md`\n\n### Task 2: Check .NET SDK\n\n```bash\ndotnet --info\n```\n\nCompare installed vs `latest-sdk` from https:\u002F\u002Fdotnetcli.blob.core.windows.net\u002Fdotnet\u002Frelease-metadata\u002Freleases-index.json where `support-phase` is `\"active\"`.\n\n### Task 3: Check MAUI Workloads\n\n| Workload | macOS | Windows | Linux |\n|----------|-------|---------|-------|\n| `maui` | Required | Required | ❌ Use `maui-android` |\n| `maui-android` | Alias | Alias | Required |\n| `android` | Required | Required | Required |\n| `ios` | Required | Optional | N\u002FA |\n\n### Task 4: Discover Requirements from NuGet\n\nSee `references\u002Fworkload-dependencies-discovery.md` for complete process.\n\nQuery NuGet for workload manifest → extract `WorkloadDependencies.json` → get:\n- `jdk.version` range and `jdk.recommendedVersion`\n- `androidsdk.packages`, `buildToolsVersion`, `apiLevel`\n- `xcode.version` range\n\n### Task 5: Validate Java JDK\n\n**Only Microsoft OpenJDK supported.** Verify `java -version` output contains \"Microsoft\". See `references\u002Fmicrosoft-openjdk.md` for detection paths.\n\n> Use the JDK version recommended by WorkloadDependencies.json (`jdk.recommendedVersion`), ensuring it satisfies the `jdk.version` range. Do not hardcode JDK versions.\n\n**JAVA_HOME is NOT required.** .NET MAUI tools auto-detect Microsoft OpenJDK installations from known paths. Do not tell users to set JAVA_HOME — it is unnecessary and risks pointing to a non-Microsoft JDK.\n\n| JAVA_HOME state | OK? | Action |\n|-----------------|-----|--------|\n| Not set | ✅ | None needed — auto-detection works |\n| Set to Microsoft JDK | ✅ | None needed |\n| Set to non-Microsoft JDK | ⚠️ | **Report as anomaly** — let user decide to unset or redirect |\n\n### Task 6: Validate Android SDK\n\nCheck packages from `androidsdk.packages`, `buildToolsVersion`, `apiLevel` (Task 4). See `references\u002Finstallation-commands.md` for sdkmanager commands.\n\n### Task 7: Validate Xcode (macOS Only)\n\n```bash\nxcodebuild -version\n```\n\nCompare against `xcode.version` range from Task 4. See `references\u002Finstallation-commands-macos.md`.\n\n### Task 8: Validate Windows SDK (Windows Only)\n\nThe Windows SDK is typically installed as part of the .NET MAUI workload or Visual Studio. See `references\u002Finstallation-commands-windows.md`.\n\n### Task 9: Remediation\n\nSee `references\u002Finstallation-commands.md` for all commands.\n\nKey rules:\n- **Workloads**: Always use `--version` flag. Never use `workload update` or `workload repair`.\n- **JDK**: Only install Microsoft OpenJDK. Do not set JAVA_HOME (auto-detected).\n- **Android SDK**: Use `sdkmanager` (from Android SDK command-line tools). On Windows use `sdkmanager.bat`.\n\n### Task 10: Re-validate\n\nAfter each fix, re-run the relevant validation task. Iterate until all checks pass.\n\n## Validation\n\nA successful run produces:\n- .NET SDK installed and matches an active release\n- All required workloads installed with consistent versions\n- Microsoft OpenJDK detected (`java -version` contains \"Microsoft\")\n- All required Android SDK packages installed (per WorkloadDependencies.json)\n- Xcode version in supported range (macOS only)\n- Windows SDK detected (Windows only)\n\n### Build Verification (Recommended)\n\nAfter all checks pass, create and build a test project to confirm the environment actually works:\n\n```bash\nTEMP_DIR=$(mktemp -d)\ndotnet new maui -o \"$TEMP_DIR\u002FMauiTest\"\ndotnet build \"$TEMP_DIR\u002FMauiTest\"\nrm -rf \"$TEMP_DIR\"\n```\n\nOn Windows, use `$env:TEMP` or `New-TemporaryFile` for the temp directory.\n\nIf the build succeeds, the environment is verified. If it fails, use the error output to diagnose remaining issues.\n\n### Run Verification (Optional — Ask User First)\n\nAfter a successful build, **ask the user** if they want to launch the app on a target platform to verify end-to-end:\n\n```bash\n# Replace net10.0 with the current major .NET version\ndotnet build -t:Run -f net10.0-android\ndotnet build -t:Run -f net10.0-ios        # macOS only\ndotnet build -t:Run -f net10.0-maccatalyst # macOS only\ndotnet build -t:Run -f net10.0-windows    # Windows only\n```\n\nOnly run the target frameworks relevant to the user's platform and intent. This step deploys to an emulator\u002Fsimulator\u002Fdevice, so confirm with the user before proceeding.\n\n## Common Pitfalls\n\n- **`maui` vs `maui-android` workload**: On Linux, the `maui` meta-workload is not available — use `maui-android` instead. On macOS\u002FWindows, `maui` installs all platform workloads.\n- **`workload update` \u002F `workload repair`**: Never use these commands. Always install workloads with an explicit `--version` flag to ensure version consistency.\n- **Non-Microsoft JDK**: Only Microsoft OpenJDK is supported. Other distributions (Oracle, Adoptium, Azul) will cause build failures even if the version is correct.\n- **Unnecessary JAVA_HOME**: Do not set JAVA_HOME. MAUI auto-detects JDK from known install paths. If JAVA_HOME is set to a non-Microsoft JDK (e.g., Temurin), report this as an anomaly — it may override auto-detection and cause failures. Let the user decide whether to unset it.\n- **Hardcoded versions**: Never hardcode SDK, workload, or dependency versions. Always discover them dynamically from the NuGet APIs (see Task 4).\n- **Android SDK `sdkmanager` on Windows**: Use `sdkmanager.bat`, not `sdkmanager`, on Windows.\n- **Stale training data**: LLM training data may reference outdated .NET versions. 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INVOKES Symbolicate-Tombstone.ps1 script, llvm-symbolizer, Microsoft symbol server.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1867,1868,1869,1870],{"name":20,"slug":21,"type":15},{"name":13,"slug":14,"type":15},{"name":29,"slug":30,"type":15},{"name":1871,"slug":1872,"type":15},"Microsoft","microsoft","2026-07-12T08:23:21.595572",{"slug":1875,"name":1875,"fn":1876,"description":1877,"org":1878,"tags":1879,"stars":31,"repoUrl":32,"updatedAt":1889},"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},[1880,1881,1882,1884,1886],{"name":20,"slug":21,"type":15},{"name":29,"slug":30,"type":15},{"name":1883,"slug":726,"type":15},"iOS",{"name":467,"slug":1885,"type":15},"macos",{"name":1887,"slug":1888,"type":15},"Observability","observability","2026-07-12T08:23:20.369986",{"slug":1891,"name":1891,"fn":1892,"description":1893,"org":1894,"tags":1895,"stars":31,"repoUrl":32,"updatedAt":1903},"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. 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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},[1910,1911,1914,1917,1920],{"name":20,"slug":21,"type":15},{"name":1912,"slug":1913,"type":15},"Blazor","blazor",{"name":1915,"slug":1916,"type":15},"C#","csharp",{"name":1918,"slug":1919,"type":15},"UI Components","ui-components",{"name":1921,"slug":1922,"type":15},"Web Development","web-development","2026-07-15T06:03:29.216359",{"slug":1925,"name":1925,"fn":1926,"description":1927,"org":1928,"tags":1929,"stars":31,"repoUrl":32,"updatedAt":1933},"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},[1930,1931,1932],{"name":1854,"slug":1855,"type":15},{"name":29,"slug":30,"type":15},{"name":1871,"slug":1872,"type":15},"2026-07-12T08:21:34.637923",{"slug":1935,"name":1935,"fn":1936,"description":1937,"org":1938,"tags":1939,"stars":31,"repoUrl":32,"updatedAt":1947},"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},[1940,1943,1944],{"name":1941,"slug":1942,"type":15},"Build","build",{"name":29,"slug":30,"type":15},{"name":1945,"slug":1946,"type":15},"Engineering","engineering","2026-07-19T05:38:19.340791",96,{"items":1950,"total":2055},[1951,1963,1970,1977,1985,1991,1999,2005,2011,2021,2034,2045],{"slug":1952,"name":1952,"fn":1953,"description":1954,"org":1955,"tags":1956,"stars":1960,"repoUrl":1961,"updatedAt":1962},"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},[1957,1958,1959],{"name":20,"slug":21,"type":15},{"name":1945,"slug":1946,"type":15},{"name":1858,"slug":1859,"type":15},5535,"https:\u002F\u002Fgithub.com\u002Fdotnet\u002Fmsbuild","2026-07-22T05:37:33.965588",{"slug":1847,"name":1847,"fn":1848,"description":1849,"org":1964,"tags":1965,"stars":31,"repoUrl":32,"updatedAt":1860},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1966,1967,1968,1969],{"name":20,"slug":21,"type":15},{"name":1854,"slug":1855,"type":15},{"name":29,"slug":30,"type":15},{"name":1858,"slug":1859,"type":15},{"slug":1862,"name":1862,"fn":1863,"description":1864,"org":1971,"tags":1972,"stars":31,"repoUrl":32,"updatedAt":1873},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1973,1974,1975,1976],{"name":20,"slug":21,"type":15},{"name":13,"slug":14,"type":15},{"name":29,"slug":30,"type":15},{"name":1871,"slug":1872,"type":15},{"slug":1875,"name":1875,"fn":1876,"description":1877,"org":1978,"tags":1979,"stars":31,"repoUrl":32,"updatedAt":1889},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1980,1981,1982,1983,1984],{"name":20,"slug":21,"type":15},{"name":29,"slug":30,"type":15},{"name":1883,"slug":726,"type":15},{"name":467,"slug":1885,"type":15},{"name":1887,"slug":1888,"type":15},{"slug":1891,"name":1891,"fn":1892,"description":1893,"org":1986,"tags":1987,"stars":31,"repoUrl":32,"updatedAt":1903},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1988,1989,1990],{"name":1854,"slug":1855,"type":15},{"name":1898,"slug":1899,"type":15},{"name":1901,"slug":1902,"type":15},{"slug":1905,"name":1905,"fn":1906,"description":1907,"org":1992,"tags":1993,"stars":31,"repoUrl":32,"updatedAt":1923},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1994,1995,1996,1997,1998],{"name":20,"slug":21,"type":15},{"name":1912,"slug":1913,"type":15},{"name":1915,"slug":1916,"type":15},{"name":1918,"slug":1919,"type":15},{"name":1921,"slug":1922,"type":15},{"slug":1925,"name":1925,"fn":1926,"description":1927,"org":2000,"tags":2001,"stars":31,"repoUrl":32,"updatedAt":1933},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[2002,2003,2004],{"name":1854,"slug":1855,"type":15},{"name":29,"slug":30,"type":15},{"name":1871,"slug":1872,"type":15},{"slug":1935,"name":1935,"fn":1936,"description":1937,"org":2006,"tags":2007,"stars":31,"repoUrl":32,"updatedAt":1947},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[2008,2009,2010],{"name":1941,"slug":1942,"type":15},{"name":29,"slug":30,"type":15},{"name":1945,"slug":1946,"type":15},{"slug":2012,"name":2012,"fn":2013,"description":2014,"org":2015,"tags":2016,"stars":31,"repoUrl":32,"updatedAt":2020},"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},[2017,2018,2019],{"name":20,"slug":21,"type":15},{"name":1945,"slug":1946,"type":15},{"name":1858,"slug":1859,"type":15},"2026-07-19T05:38:18.364937",{"slug":2022,"name":2022,"fn":2023,"description":2024,"org":2025,"tags":2026,"stars":31,"repoUrl":32,"updatedAt":2033},"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},[2027,2028,2031,2032],{"name":1945,"slug":1946,"type":15},{"name":2029,"slug":2030,"type":15},"Monitoring","monitoring",{"name":1858,"slug":1859,"type":15},{"name":1901,"slug":1902,"type":15},"2026-07-12T08:21:35.865649",{"slug":2035,"name":2035,"fn":2036,"description":2037,"org":2038,"tags":2039,"stars":31,"repoUrl":32,"updatedAt":2044},"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},[2040,2041,2042,2043],{"name":20,"slug":21,"type":15},{"name":29,"slug":30,"type":15},{"name":1945,"slug":1946,"type":15},{"name":1858,"slug":1859,"type":15},"2026-07-12T08:21:40.961722",{"slug":2046,"name":2046,"fn":2047,"description":2048,"org":2049,"tags":2050,"stars":31,"repoUrl":32,"updatedAt":2054},"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},[2051,2052,2053],{"name":29,"slug":30,"type":15},{"name":1945,"slug":1946,"type":15},{"name":1898,"slug":1899,"type":15},"2026-07-19T05:38:14.336279",144]