[tooling] Replace ProcessUtils with native .NET 11 APIs

.github/copilot-instructions.md

@@ -21,13 +21,13 @@
 
 ### Shared Android tooling
 
-The in-tree Android tools libraries include SDK/JDK discovery (`AndroidSdkInfo`, `JdkInfo`, SDK manifest parsing, `AdbRunner`, `EmulatorRunner`) and MSBuild task infrastructure (`AndroidTask`, `AndroidToolTask`, `AsyncTask`, `Files`, `ProcessUtils`, `FileUtil`, `MemoryStreamPool`). They target `netstandard2.0` and/or modern .NET, so verify API availability across all target frameworks before using newer BCL APIs. Prefer `ANDROID_HOME` for new Android SDK environment handling; `ANDROID_SDK_ROOT` is deprecated and should only remain for compatibility.
+The in-tree Android SDK tools (`AndroidSdkInfo`, `JdkInfo`, `AdbRunner`, `EmulatorRunner`) require .NET 11. Call purpose-built native process APIs at their actual owners instead of adding a generic execution facade. Shared BaseTasks (`AndroidTask`, `AndroidToolTask`, `AsyncTask`, `Files`, `MemoryStreamPool`) still support their own target frameworks; verify API availability per owner. Prefer `ANDROID_HOME` for new Android SDK environment handling; `ANDROID_SDK_ROOT` is deprecated and should only remain for compatibility.
 
 Useful focused checks:
 ```sh
 dotnet build src/Microsoft.Android.Build.BaseTasks/Microsoft.Android.Build.BaseTasks.csproj
 dotnet build src/Xamarin.Android.Tools.AndroidSdk/Xamarin.Android.Tools.AndroidSdk.csproj
-dotnet test tests/Xamarin.Android.Tools.AndroidSdk-Tests/Xamarin.Android.Tools.AndroidSdk-Tests.csproj -p:AndroidToolsDisableMultiTargeting=false -p:DotNetTargetFrameworkVersion=10.0
+dotnet test tests/Xamarin.Android.Tools.AndroidSdk-Tests/Xamarin.Android.Tools.AndroidSdk-Tests.csproj
 dotnet test tests/Microsoft.Android.Build.BaseTasks-Tests/Microsoft.Android.Build.BaseTasks-Tests.csproj
 ```
 

.github/skills/code-review/references/csharp-rules.md

@@ -8,8 +8,8 @@ General C# guidance applicable to any .NET repository.
 
 | Check | What to look for |
 |-------|-----------------|
-| **Oldest TFM must compile** | Code under `src/Microsoft.Android.Build.BaseTasks/` and `src/Xamarin.Android.Tools.AndroidSdk/` may target `netstandard2.0` and modern .NET. Verify every API and overload against the oldest target framework; common traps include cancellation-token overloads such as `HttpContent.ReadAsStringAsync(CancellationToken)`, modern `ProcessStartInfo.ArgumentList` usage without the existing fallback helpers, and newer language/BCL features that need `#if` guards or polyfills. |
-| **Prefer existing compatibility helpers** | Use repository helpers such as `ProcessUtils`, `FileUtil`, and nullable extension methods instead of direct modern-BCL calls when they provide `netstandard2.0` fallbacks or better annotations. |
+| **Verify the owner's target framework** | BaseTasks still support `netstandard2.0`; the Android SDK tools require .NET 11. Check APIs against each actual owner rather than imposing unrelated product/legacy constraints. |
+| **Prefer purpose-built APIs** | SDK command owners should use native execution, capture, and streaming APIs directly. Do not introduce older-runtime adapters or a generic process facade. Keep compatible APIs only where the actual project still targets older frameworks. |
 
 ---
 

.github/skills/code-review/references/repo-conventions.md

@@ -40,7 +40,7 @@ and merge conflicts.
 | Check | What to look for |
 |-------|-----------------|
 | **Use existing utilities** | Check `MonoAndroidHelper`, `FileUtil`, `PathUtil`, `ITaskItemExtensions`, and other utilities before writing new helpers. Duplicating existing logic is the most expensive AI pattern. |
-| **Use Android tools utilities** | In the shared Android tooling under `src/`, process execution should go through `ProcessUtils`, file extraction/download/checksum/path helpers through `FileUtil`, and repeated buffers/streams through `ObjectPool<T>` or `MemoryStreamPool` where applicable. |
+| **Use owner-specific utilities** | Use purpose-built .NET 11 process APIs at the SDK tool/command owner, not a generic execution facade. Reuse `FileUtil` for file extraction/download/checksum/path helpers and existing pools for repeated buffers/streams where applicable. |
 | **`Log.LogDebugMessage` for diagnostics** | Use `Log.LogDebugMessage(…)` for verbose/debug output, not `Console.WriteLine` or `Debug.WriteLine`. Don't spam logcat with messages that fire on every type lookup miss. (Postmortem `#9`) |
 | **Android tools logger delegate** | SDK/JDK discovery helpers in `src/Xamarin.Android.Tools.AndroidSdk/` commonly use `Action<TraceLevel, string>? logger` (see `AndroidSdkInfo.DefaultConsoleLogger`) so callers can route diagnostics into MSBuild or IDE logs. Don't replace this with `Console.WriteLine` or `Debug.WriteLine`. |
 | **Return `IReadOnlyList<T>`** | Public methods should return `IReadOnlyList<T>` or `IReadOnlyCollection<T>` instead of mutable `List<T>`. |

.github/skills/read-assembly-store/SKILL.md

@@ -5,7 +5,8 @@ description: Inspect and list managed assemblies in .NET for Android APK, AAB, l
 
 # Read Assembly Store
 
-Inspect the package locally with the bundled C# file-based app. Never upload customer packages or extracted code.
+Inspect the package locally with the bundled C# file-based app using a .NET 11 SDK.
+Never upload customer packages or extracted code.
 
 ## Workflow
 

.github/skills/read-assembly-store/src/AssemblyStore/AssemblyStore.csproj

@@ -4,14 +4,17 @@
   <PropertyGroup>
     <Company>Microsoft Corporation</Company>
     <Copyright>2026 Microsoft Corporation</Copyright>
-    <TargetFrameworks>$(DotNetStableTargetFramework);$(DotNetTargetFramework)</TargetFrameworks>
+    <TargetFramework>net11.0</TargetFramework>
+    <RuntimeFrameworkVersion>11.0.0-rtm.26479.103</RuntimeFrameworkVersion>
+    <RestoreAdditionalProjectSources>$(RestoreAdditionalProjectSources);https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet11/nuget/v3/index.json</RestoreAdditionalProjectSources>
     <AssemblyName>Xamarin.Android.AssemblyStore</AssemblyName>
     <RootNamespace>Xamarin.Android.AssemblyStore</RootNamespace>
     <ImplicitUsings>disable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
   <ItemGroup>
+    <FrameworkReference Update="Microsoft.NETCore.App" TargetingPackVersion="$(RuntimeFrameworkVersion)" />
     <PackageReference Include="Xamarin.LibZipSharp" Version="$(LibZipSharpVersion)" />
     <PackageReference Include="System.IO.Hashing" Version="$(SystemIOHashingPackageVersion)" />
     <PackageReference Include="ELFSharp" Version="$(ELFSharpVersion)" />

.github/skills/read-assembly-store/tests/AssemblyStore.Tests/AssemblyStore.Tests.csproj

@@ -3,13 +3,16 @@
   <Import Project="..\..\..\..\..\build-tools\scripts\NUnitReferences.projitems" />
 
   <PropertyGroup>
-    <TargetFrameworks>$(DotNetStableTargetFramework);$(DotNetTargetFramework)</TargetFrameworks>
+    <TargetFramework>net11.0</TargetFramework>
+    <RuntimeFrameworkVersion>11.0.0-rtm.26479.103</RuntimeFrameworkVersion>
+    <RestoreAdditionalProjectSources>$(RestoreAdditionalProjectSources);https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet11/nuget/v3/index.json</RestoreAdditionalProjectSources>
     <Nullable>enable</Nullable>
     <IsPackable>false</IsPackable>
     <RootNamespace>Xamarin.Android.AssemblyStore.Tests</RootNamespace>
   </PropertyGroup>
 
   <ItemGroup>
+    <FrameworkReference Update="Microsoft.NETCore.App" TargetingPackVersion="$(RuntimeFrameworkVersion)" />
     <PackageReference Include="K4os.Compression.LZ4" Version="$(LZ4PackageVersion)" />
   </ItemGroup>
 

.github/skills/tests/references/test-catalog.md

@@ -10,6 +10,10 @@ Mapping of test area keywords to assemblies, filters, and build prerequisites.
   - **Full-build** — Requires the local SDK (`dotnet-local.sh`). Build with `./dotnet-local.sh build Microsoft.Android.slnx -c Debug` or `make prepare && make all`.
 - **Device**: Whether an Android device/emulator is required.
 
+The native process harnesses, SDK fixtures, and `vswhere` select the
+`11.0.0-rtm.26479.103` runtime and targeting pack explicitly. This keeps the pinned
+.NET 12 CI SDK from silently raising the requirement behind their `net11.0` paths.
+
 ---
 
 ## Standalone Tests — No Local SDK Required
@@ -34,7 +38,7 @@ These tests can be run immediately with `dotnet test` on the `.csproj`, even if
 | **generator** | `external/Java.Interop/tests/generator-Tests/` | `dotnet test external/Java.Interop/tests/generator-Tests/generator-Tests.csproj -v minimal` |
 | **bytecode** | `external/Java.Interop/tests/Xamarin.Android.Tools.Bytecode-Tests/` | `dotnet test external/Java.Interop/tests/Xamarin.Android.Tools.Bytecode-Tests/Xamarin.Android.Tools.Bytecode-Tests.csproj -v minimal` ⚠️ Requires `javac` |
 | **base tasks** | `tests/Microsoft.Android.Build.BaseTasks-Tests/` | `dotnet test tests/Microsoft.Android.Build.BaseTasks-Tests/Microsoft.Android.Build.BaseTasks-Tests.csproj -v minimal` |
-| **android sdk tools** | `tests/Xamarin.Android.Tools.AndroidSdk-Tests/` | `dotnet test tests/Xamarin.Android.Tools.AndroidSdk-Tests/Xamarin.Android.Tools.AndroidSdk-Tests.csproj -v minimal -p:AndroidToolsDisableMultiTargeting=false -p:DotNetTargetFrameworkVersion=10.0` |
+| **android sdk tools (.NET 11)** | `tests/Xamarin.Android.Tools.AndroidSdk-Tests/` | `dotnet test tests/Xamarin.Android.Tools.AndroidSdk-Tests/Xamarin.Android.Tools.AndroidSdk-Tests.csproj -v minimal` |
 
 ---
 

build-tools/automation/azure-pipelines-internal.yaml

@@ -263,7 +263,7 @@ extends:
         - template: /build-tools/automation/yaml-templates/run-nunit-tests.yaml@self
           parameters:
             testRunTitle: Xamarin.Android.Build.Tests - Linux BuildTest
-            testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/$(DotNetStableTargetFramework)/Xamarin.Android.Build.Tests.dll
+            testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/net11.0/Xamarin.Android.Build.Tests.dll
             dotNetTestExtraArgs: --filter "Name = BuildTest"
 
         - template: /build-tools/automation/yaml-templates/upload-results.yaml@self
@@ -297,19 +297,19 @@ extends:
         - template: /build-tools/automation/yaml-templates/run-nunit-tests.yaml@self
           parameters:
             testRunTitle: Xamarin.Android.Build.Tests - Linux PackagingTest
-            testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/$(DotNetStableTargetFramework)/Xamarin.Android.Build.Tests.dll
+            testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/net11.0/Xamarin.Android.Build.Tests.dll
             dotNetTestExtraArgs: --filter "Name = PackagingTest"
 
         - template: /build-tools/automation/yaml-templates/run-nunit-tests.yaml@self
           parameters:
             testRunTitle: Xamarin.Android.Build.Tests - Linux XASdkTests
-            testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/$(DotNetStableTargetFramework)/Xamarin.Android.Build.Tests.dll
+            testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/net11.0/Xamarin.Android.Build.Tests.dll
             dotNetTestExtraArgs: --filter "Name = XASdkTests & Name != XamarinLegacySdk"
 
         - template: /build-tools/automation/yaml-templates/run-nunit-tests.yaml@self
           parameters:
             testRunTitle: Xamarin.Android.Build.Tests - Linux AndroidDependenciesTests
-            testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/$(DotNetStableTargetFramework)/Xamarin.Android.Build.Tests.dll
+            testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/net11.0/Xamarin.Android.Build.Tests.dll
             dotNetTestExtraArgs: --filter "Name = AndroidDependenciesTests"
 
         - task: ShellScript@2
@@ -692,7 +692,7 @@ extends:
 
         - template: /build-tools/automation/yaml-templates/run-sliced-nunit-tests.yaml@self
           parameters:
-            testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/$(DotNetStableTargetFramework)/Xamarin.Android.Build.Tests.dll
+            testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/net11.0/Xamarin.Android.Build.Tests.dll
             testFilter: ''
             testRunTitle: Xamarin.Android.Build.Tests - macOS
             retryFailedTests: false
@@ -744,7 +744,7 @@ extends:
 
         - template: /build-tools/automation/yaml-templates/run-sliced-nunit-tests.yaml@self
           parameters:
-            testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/$(DotNetStableTargetFramework)/Xamarin.Android.Build.Tests.dll
+            testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/net11.0/Xamarin.Android.Build.Tests.dll
             testFilter: ''
             testRunTitle: Xamarin.Android.Build.Tests - Windows
             retryFailedTests: false
@@ -806,7 +806,7 @@ extends:
 
         - template: /build-tools/automation/yaml-templates/run-sliced-nunit-tests.yaml@self
           parameters:
-            testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/MSBuildDeviceIntegration/$(DotNetStableTargetFramework)/MSBuildDeviceIntegration.dll
+            testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/MSBuildDeviceIntegration/net11.0/MSBuildDeviceIntegration.dll
             testFilter: $(ExcludedNightlyNUnitCategories)
             testRunTitle: MSBuildDeviceIntegration On Device - macOS
 

build-tools/automation/azure-pipelines-nightly.yaml

@@ -162,7 +162,7 @@ stages:
       - template: run-nunit-tests.yaml
         parameters:
           testRunTitle: SystemApplicationTests On Device - macOS
-          testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/MSBuildDeviceIntegration/$(DotNetStableTargetFramework)/MSBuildDeviceIntegration.dll
+          testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/MSBuildDeviceIntegration/net11.0/MSBuildDeviceIntegration.dll
           dotNetTestExtraArgs: --filter "Name=SystemApplicationTests"
 
 
@@ -206,7 +206,7 @@ stages:
 
     - template: /build-tools/automation/yaml-templates/run-sliced-nunit-tests.yaml
       parameters:
-        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/MSBuildDeviceIntegration/$(DotNetStableTargetFramework)/MSBuildDeviceIntegration.dll
+        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/MSBuildDeviceIntegration/net11.0/MSBuildDeviceIntegration.dll
         testFilter: method == CheckTimeZoneInfoIsCorrectWithSlicer
         testRunTitle: CheckTimeZoneInfoIsCorrectNode On Device - macOS
 
@@ -258,7 +258,7 @@ stages:
 
     - template: /build-tools/automation/yaml-templates/run-sliced-nunit-tests.yaml
       parameters:
-        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/MSBuildDeviceIntegration/$(DotNetStableTargetFramework)/MSBuildDeviceIntegration.dll
+        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/MSBuildDeviceIntegration/net11.0/MSBuildDeviceIntegration.dll
         testFilter: method == CheckLocalizationIsCorrectWithSlicer
         testRunTitle: CheckLocalizationIsCorrect On Device - macOS
 

build-tools/automation/azure-pipelines-public.yaml

@@ -202,7 +202,7 @@ stages:
     - template: /build-tools/automation/yaml-templates/run-nunit-tests.yaml
       parameters:
         testRunTitle: Xamarin.Android.Build.Tests - Linux BuildTest
-        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/$(DotNetStableTargetFramework)/Xamarin.Android.Build.Tests.dll
+        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/net11.0/Xamarin.Android.Build.Tests.dll
         dotNetTestExtraArgs: --filter "Name = BuildTest"
 
     - template: /build-tools/automation/yaml-templates/upload-results.yaml
@@ -236,19 +236,19 @@ stages:
     - template: /build-tools/automation/yaml-templates/run-nunit-tests.yaml
       parameters:
         testRunTitle: Xamarin.Android.Build.Tests - Linux PackagingTest
-        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/$(DotNetStableTargetFramework)/Xamarin.Android.Build.Tests.dll
+        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/net11.0/Xamarin.Android.Build.Tests.dll
         dotNetTestExtraArgs: --filter "Name = PackagingTest"
 
     - template: /build-tools/automation/yaml-templates/run-nunit-tests.yaml
       parameters:
         testRunTitle: Xamarin.Android.Build.Tests - Linux XASdkTests
-        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/$(DotNetStableTargetFramework)/Xamarin.Android.Build.Tests.dll
+        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/net11.0/Xamarin.Android.Build.Tests.dll
         dotNetTestExtraArgs: --filter "Name = XASdkTests & Name != XamarinLegacySdk"
 
     - template: /build-tools/automation/yaml-templates/run-nunit-tests.yaml
       parameters:
         testRunTitle: Xamarin.Android.Build.Tests - Linux AndroidDependenciesTests
-        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/$(DotNetStableTargetFramework)/Xamarin.Android.Build.Tests.dll
+        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/net11.0/Xamarin.Android.Build.Tests.dll
         dotNetTestExtraArgs: --filter "Name = AndroidDependenciesTests"
 
     - task: ShellScript@2
@@ -305,7 +305,7 @@ stages:
 
     - template: /build-tools/automation/yaml-templates/run-sliced-nunit-tests.yaml
       parameters:
-        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/$(DotNetStableTargetFramework)/Xamarin.Android.Build.Tests.dll
+        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/net11.0/Xamarin.Android.Build.Tests.dll
         testFilter: ''
         testRunTitle: Xamarin.Android.Build.Tests - macOS
         retryFailedTests: false
@@ -357,7 +357,7 @@ stages:
 
     - template: /build-tools/automation/yaml-templates/run-sliced-nunit-tests.yaml
       parameters:
-        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/$(DotNetStableTargetFramework)/Xamarin.Android.Build.Tests.dll
+        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/net11.0/Xamarin.Android.Build.Tests.dll
         testFilter: ''
         testRunTitle: Xamarin.Android.Build.Tests - Windows
         retryFailedTests: false
@@ -418,7 +418,7 @@ stages:
 
     - template: /build-tools/automation/yaml-templates/run-sliced-nunit-tests.yaml
       parameters:
-        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/MSBuildDeviceIntegration/$(DotNetStableTargetFramework)/MSBuildDeviceIntegration.dll
+        testAssembly: $(System.DefaultWorkingDirectory)/bin/Test$(XA.Build.Configuration)/MSBuildDeviceIntegration/net11.0/MSBuildDeviceIntegration.dll
         testFilter: $(ExcludedNightlyNUnitCategories)
         testRunTitle: MSBuildDeviceIntegration On Device - macOS
 

build-tools/automation/yaml-templates/build-windows-steps.yaml

@@ -71,7 +71,7 @@ steps:
 - template: /build-tools/automation/yaml-templates/run-nunit-tests.yaml
   parameters:
     testRunTitle: Smoke MSBuild Tests - Windows Dotnet Build
-    testAssembly: $(System.DefaultWorkingDirectory)\bin\Test$(XA.Build.Configuration)\$(DotNetStableTargetFramework)\Xamarin.Android.Build.Tests.dll
+    testAssembly: $(System.DefaultWorkingDirectory)\bin\Test$(XA.Build.Configuration)\net11.0\Xamarin.Android.Build.Tests.dll
     dotNetTestExtraArgs: --filter "TestCategory = SmokeTests"
 
 - template: /build-tools/automation/yaml-templates/run-dotnet-preview.yaml@self

build-tools/automation/yaml-templates/run-msbuild-tests.yaml

@@ -50,7 +50,7 @@ jobs:
 
   - template: /build-tools/automation/yaml-templates/run-sliced-nunit-tests.yaml
     parameters:
-      testAssembly: ${{ parameters.xaSourcePath }}/bin/Test$(XA.Build.Configuration)/$(DotNetStableTargetFramework)/Xamarin.Android.Build.Tests.dll
+      testAssembly: ${{ parameters.xaSourcePath }}/bin/Test$(XA.Build.Configuration)/net11.0/Xamarin.Android.Build.Tests.dll
       testFilter: ${{ parameters.testFilter }}
       testRunTitle: Xamarin.Android.Build.Tests - ${{ parameters.testOS }}
       retryFailedTests: false