dotnet · Copilot · Jun 18, 2026 · Jun 18, 2026 · Jun 18, 2026
diff --git a/Documentation/DependencyFlowOnboardingWithoutArcade.md b/Documentation/DependencyFlowOnboardingWithoutArcade.md
@@ -80,8 +80,6 @@ If you only have one Azure DevOps job that publishes assets, then you can add th
     scriptLocation: scriptPath
     scriptPath: $(System.DefaultWorkingDirectory)/eng/common/sdk-task.ps1
     arguments: -task PublishBuildAssets
-      -restore
-      -msbuildEngine dotnet
       /p:ManifestsPath='$(Build.StagingDirectory)/Download/AssetManifests'
       /p:MaestroApiEndpoint=https://maestro.dot.net"
 ```

diff --git a/eng/common/build.ps1 b/eng/common/build.ps1
@@ -1,13 +1,13 @@
 [CmdletBinding(PositionalBinding=$false)]
 Param(
-  [string][Alias('c')]$configuration = "Debug",
-  [string]$platform = $null,
+  [string][Alias('c')]$configuration,
+  [string]$platform,
   [string] $projects,
-  [string][Alias('v')]$verbosity = "minimal",
-  [string] $msbuildEngine = $null,
-  [bool] $warnAsError = $true,
-  [string] $warnNotAsError = '',
-  [bool] $nodeReuse = $true,
+  [string][Alias('v')]$verbosity,
+  [string] $msbuildEngine,
+  [bool] $warnAsError,
+  [string] $warnNotAsError,
+  [bool] $nodeReuse,
   [switch] $buildCheck = $false,
   [switch][Alias('r')]$restore,
   [switch] $deployDeps,
@@ -28,8 +28,8 @@ Param(
   [switch][Alias('nobl')]$excludeCIBinarylog,
   [switch] $ci,
   [switch] $prepareMachine,
-  [string] $runtimeSourceFeed = '',
-  [string] $runtimeSourceFeedKey = '',
+  [string] $runtimeSourceFeed,
+  [string] $runtimeSourceFeedKey,
   [switch] $excludePrereleaseVS,
   [switch] $nativeToolsOnMachine,
   [switch] $help,
@@ -86,6 +86,10 @@ function Print-Usage() {
   Write-Host "The above arguments can be shortened as much as to be unambiguous (e.g. -co for configuration, -t for test, etc.)."
 }
 
+# Opt in to letting tools.ps1 own the CI/environment-aware defaults for the parameters it
+# manages (e.g. binaryLog, nodeReuse, configuration); see tools.ps1 for details.
+$importerBoundParameters = $PSBoundParameters
+
 . $PSScriptRoot\tools.ps1
 
 function InitializeCustomToolset {
@@ -169,17 +173,6 @@ try {
     exit 0
   }
 
-  if ($ci) {
-    if (-not $excludeCIBinarylog) {
-      $binaryLog = $true
-    }
-    # Disable node reuse on CI unless explicitly opted in via MSBUILD_NODEREUSE_ENABLED.
-    # Internal testing only; this env var will be replaced with a switch (https://github.com/dotnet/arcade/issues/17013) and must not be depended on.
-    if ($env:MSBUILD_NODEREUSE_ENABLED -ne "1") {
-      $nodeReuse = $false
-    }
-  }
-
   if (-not [string]::IsNullOrEmpty($binaryLogName)) {
     $binaryLog = $true
   }

diff --git a/eng/common/build.sh b/eng/common/build.sh
@@ -67,7 +67,6 @@ restore=false
 build=false
 source_build=false
 product_build=false
-from_vmr=false
 rebuild=false
 test=false
 integration_test=false
@@ -76,23 +75,12 @@ pack=false
 publish=false
 sign=false
 public=false
-ci=false
 clean=false
 
-warn_as_error=true
-warn_not_as_error=''
-node_reuse=true
 build_check=false
-binary_log=false
 binary_log_name=''
-exclude_ci_binary_log=false
 
 projects=''
-configuration=''
-prepare_machine=false
-verbosity='minimal'
-runtime_source_feed=''
-runtime_source_feed_key=''
 
 properties=()
 while [[ $# -gt 0 ]]; do
@@ -208,21 +196,6 @@ while [[ $# -gt 0 ]]; do
   shift
 done
 
-if [[ -z "$configuration" ]]; then
-  if [[ "$source_build" = true ]]; then configuration="Release"; else configuration="Debug"; fi
-fi
-
-if [[ "$ci" == true ]]; then
-  # Disable node reuse on CI unless explicitly opted in via MSBUILD_NODEREUSE_ENABLED.
-  # Internal testing only; this env var will be replaced with a switch (https://github.com/dotnet/arcade/issues/17013) and must not be depended on.
-  if [[ "${MSBUILD_NODEREUSE_ENABLED:-}" != "1" ]]; then
-    node_reuse=false
-  fi
-  if [[ "$exclude_ci_binary_log" == false ]]; then
-    binary_log=true
-  fi
-fi
-
 . "$scriptroot/tools.sh"
 
 function InitializeCustomToolset {

diff --git a/eng/common/core-templates/job/publish-build-assets.yml b/eng/common/core-templates/job/publish-build-assets.yml
@@ -135,7 +135,7 @@ jobs:
         scriptType: ps
         scriptLocation: scriptPath
         scriptPath: $(System.DefaultWorkingDirectory)/eng/common/sdk-task.ps1
-        arguments: -task PublishBuildAssets -restore -msbuildEngine dotnet
+        arguments: -task PublishBuildAssets -msbuildEngine dotnet
           /p:ManifestsPath='$(Build.StagingDirectory)/AssetManifests'
           /p:IsAssetlessBuild=${{ parameters.isAssetlessBuild }}
           /p:MaestroApiEndpoint=https://maestro.dot.net

diff --git a/eng/common/core-templates/post-build/post-build.yml b/eng/common/core-templates/post-build/post-build.yml
@@ -225,7 +225,7 @@ stages:
         displayName: Validate
         inputs:
           filePath: eng\common\sdk-task.ps1
-          arguments: -task SigningValidation -restore -msbuildEngine dotnet
+          arguments: -task SigningValidation -msbuildEngine dotnet
             /p:PackageBasePath='$(Build.ArtifactStagingDirectory)/PackageArtifacts'
             /p:SignCheckExclusionsFile='$(System.DefaultWorkingDirectory)/eng/SignCheckExclusionsFile.txt'
             ${{ parameters.signingValidationAdditionalParameters }}

diff --git a/eng/common/darc-init.ps1 b/eng/common/darc-init.ps1
@@ -1,10 +1,14 @@
 param (
     $darcVersion = $null,
     $versionEndpoint = 'https://maestro.dot.net/api/assets/darc-version?api-version=2020-02-20',
-    $verbosity = 'minimal',
+    $verbosity,
     $toolpath = $null
 )
 
+# Opt in to letting tools.ps1 own the CI/environment-aware defaults for the parameters it
+# manages (e.g. verbosity); see tools.ps1 for details.
+$importerBoundParameters = $PSBoundParameters
+
 . $PSScriptRoot\tools.ps1
 
 function InstallDarcCli ($darcVersion, $toolpath) {

diff --git a/eng/common/darc-init.sh b/eng/common/darc-init.sh
@@ -3,7 +3,6 @@
 source="${BASH_SOURCE[0]}"
 darcVersion=''
 versionEndpoint='https://maestro.dot.net/api/assets/darc-version?api-version=2020-02-20'
-verbosity='minimal'
 
 while [[ $# -gt 0 ]]; do
   opt="$(echo "$1" | tr "[:upper:]" "[:lower:]")"

diff --git a/eng/common/dotnet-install.ps1 b/eng/common/dotnet-install.ps1
@@ -1,13 +1,17 @@
 [CmdletBinding(PositionalBinding=$false)]
 Param(
-  [string] $verbosity = 'minimal',
+  [string] $verbosity,
   [string] $architecture = '',
   [string] $version = 'Latest',
   [string] $runtime = 'dotnet',
-  [string] $RuntimeSourceFeed = '',
-  [string] $RuntimeSourceFeedKey = ''
+  [string] $RuntimeSourceFeed,
+  [string] $RuntimeSourceFeedKey
 )
 
+# Opt in to letting tools.ps1 own the CI/environment-aware defaults for the parameters it
+# manages (e.g. verbosity, runtimeSourceFeed); see tools.ps1 for details.
+$importerBoundParameters = $PSBoundParameters
+
 . $PSScriptRoot\tools.ps1
 
 if (-not [string]::IsNullOrEmpty($env:DOTNET_GLOBAL_INSTALL_DIR)) {

diff --git a/eng/common/msbuild.ps1 b/eng/common/msbuild.ps1
@@ -1,26 +1,22 @@
 [CmdletBinding(PositionalBinding=$false)]
 Param(
-  [string] $verbosity = 'minimal',
-  [bool] $warnAsError = $true,
-  [bool] $nodeReuse = $true,
+  [string] $verbosity,
+  [bool] $warnAsError,
+  [bool] $nodeReuse,
   [switch] $ci,
   [switch] $prepareMachine,
   [switch] $excludePrereleaseVS,
-  [string] $msbuildEngine = $null,
+  [string] $msbuildEngine,
   [Parameter(ValueFromRemainingArguments=$true)][String[]]$extraArgs
 )
 
+# Opt in to letting tools.ps1 own the CI/environment-aware defaults for the parameters it
+# manages (e.g. nodeReuse, warnAsError, verbosity); see tools.ps1 for details.
+$importerBoundParameters = $PSBoundParameters
+
 . $PSScriptRoot\tools.ps1
 
 try {
-  if ($ci) {
-    # Disable node reuse on CI unless explicitly opted in via MSBUILD_NODEREUSE_ENABLED.
-    # Internal testing only; this env var will be replaced with a switch (https://github.com/dotnet/arcade/issues/17013) and must not be depended on.
-    if ($env:MSBUILD_NODEREUSE_ENABLED -ne "1") {
-      $nodeReuse = $false
-    }
-  }
-
   MSBuild @extraArgs
 } 
 catch {

diff --git a/eng/common/msbuild.sh b/eng/common/msbuild.sh
@@ -12,10 +12,6 @@ while [[ -h "$source" ]]; do
 done
 scriptroot="$( cd -P "$( dirname "$source" )" && pwd )"
 
-verbosity='minimal'
-warn_as_error=true
-node_reuse=true
-prepare_machine=false
 extra_args=''
 
 while (($# > 0)); do
@@ -50,13 +46,5 @@ done
 
 . "$scriptroot/tools.sh"
 
-if [[ "$ci" == true ]]; then
-  # Disable node reuse on CI unless explicitly opted in via MSBUILD_NODEREUSE_ENABLED.
-  # Internal testing only; this env var will be replaced with a switch (https://github.com/dotnet/arcade/issues/17013) and must not be depended on.
-  if [[ "${MSBUILD_NODEREUSE_ENABLED:-}" != "1" ]]; then
-    node_reuse=false
-  fi
-fi
-
 MSBuild $extra_args
 ExitWithExitCode 0
diff --git a/eng/common/sdk-task.ps1 b/eng/common/sdk-task.ps1
@@ -1,29 +1,35 @@
 [CmdletBinding(PositionalBinding=$false)]
 Param(
-  [string] $configuration = 'Debug',
+  [string] $configuration,
   [string] $task,
-  [string] $verbosity = 'minimal',
-  [string] $msbuildEngine = $null,
-  [switch] $restore,
+  [string] $verbosity,
+  [string] $msbuildEngine,
+  [switch] $noRestore,
   [switch] $prepareMachine,
   [switch][Alias('nobl')]$excludeCIBinaryLog,
   [switch]$noWarnAsError,
   [switch] $help,
-  [string] $runtimeSourceFeed = '',
-  [string] $runtimeSourceFeedKey = '',
+  [string] $runtimeSourceFeed,
+  [string] $runtimeSourceFeedKey,
   [Parameter(ValueFromRemainingArguments=$true)][String[]]$properties
 )
 
 $ci = $true
 $binaryLog = if ($excludeCIBinaryLog) { $false } else { $true }
 $warnAsError = if ($noWarnAsError) { $false } else { $true }
+$restore = -not $noRestore
+
+# Opt in to letting tools.ps1 own the CI/environment-aware defaults for the parameters it
+# manages (e.g. configuration, verbosity). The $binaryLog/$warnAsError values set above by
+# assignment are preserved, because only declared-but-unpassed parameters are unbound.
+$importerBoundParameters = $PSBoundParameters
 
 . $PSScriptRoot\tools.ps1
 
 function Print-Usage() {
   Write-Host "Common settings:"
   Write-Host "  -task <value>           Name of Arcade task (name of a project in toolset directory of the Arcade SDK package)"
-  Write-Host "  -restore                Restore dependencies"
+  Write-Host "  -noRestore              Skip restoring dependencies"
   Write-Host "  -verbosity <value>      Msbuild verbosity: q[uiet], m[inimal], n[ormal], d[etailed], and diag[nostic]"
   Write-Host "  -help                   Print help and exit"
   Write-Host ""
@@ -36,22 +42,6 @@ function Print-Usage() {
   Write-Host "Command line arguments not listed above are passed thru to msbuild."
 }
 
-function Build([string]$target) {
-  $logSuffix = if ($target -eq 'Execute') { '' } else { ".$target" }
-  $log = Join-Path $LogDir "$task$logSuffix.binlog"
-  $binaryLogArg = if ($binaryLog) { "/bl:$log" } else { "" }
-  $outputPath = Join-Path $ToolsetDir "$task\"
-
-  MSBuild $taskProject `
-    $binaryLogArg `
-    /t:$target `
-    /p:Configuration=$configuration `
-    /p:RepoRoot=$RepoRoot `
-    /p:BaseIntermediateOutputPath=$outputPath `
-    /v:$verbosity `
-    @properties
-}
-
 try {
   if ($help -or (($null -ne $properties) -and ($properties.Contains('/help') -or $properties.Contains('/?')))) {
     Print-Usage
@@ -75,11 +65,20 @@ try {
     ExitWithExitCode 1
   }
 
-  if ($restore) {
-    Build 'Restore'
-  }
+  $log = Join-Path $LogDir "$task.binlog"
+  $binaryLogArg = if ($binaryLog) { "/bl:$log" } else { "" }
+  $restoreArg = if ($restore) { "/restore" } else { "" }
+  $outputPath = Join-Path $ToolsetDir "$task\"
 
-  Build 'Execute'
+  MSBuild $taskProject `
+    $binaryLogArg `
+    $restoreArg `
+    /t:Execute `
+    /p:Configuration=$configuration `
+    /p:RepoRoot=$RepoRoot `
+    /p:BaseIntermediateOutputPath=$outputPath `
+    /v:$verbosity `
+    @properties
 }
 catch {
   Write-Host $_.ScriptStackTrace