diff --git a/Documentation/ArcadeSdk.md b/Documentation/ArcadeSdk.md
index d6d9f3ee7c9..143e5953915 100644
--- a/Documentation/ArcadeSdk.md
+++ b/Documentation/ArcadeSdk.md
@@ -649,7 +649,7 @@ The following task restores tools that are only available from internal feeds.
       feedsToUse: config
       restoreSolution: 'eng\common\internal\Tools.csproj'
       nugetConfigPath: 'NuGet.config'
-      restoreDirectory: '$(Build.SourcesDirectory)\.packages'
+      restoreDirectory: '$(System.DefaultWorkingDirectory)\.packages'
 ```
 
 [The tools](https://github.com/dotnet/arcade/blob/master/eng/common/internal/Tools.csproj) are restored conditionally based on which Arcade SDK features the repository uses (these are specified via `UsingToolXxx` properties).
@@ -692,7 +692,7 @@ The Build Pipeline needs to link the following variable group:
 - task: PublishBuildArtifacts@1
     displayName: Publish Logs
     inputs:
-      PathtoPublish: '$(Build.SourcesDirectory)\artifacts\log\$(BuildConfiguration)'
+      PathtoPublish: '$(System.DefaultWorkingDirectory)\artifacts\log\$(BuildConfiguration)'
       ArtifactName: '$(OperatingSystemName) $(BuildConfiguration)'
     continueOnError: true
     condition: not(succeeded())
@@ -834,7 +834,7 @@ The following build definition steps are required for successful generation of a
     inputs:
       dropServiceURI: 'https://devdiv.artifacts.visualstudio.com'
       buildNumber: 'ProfilingInputs/DevDiv/$(Build.Repository.Name)/$(Build.SourceBranchName)/$(Build.BuildNumber)'
-      sourcePath: '$(Build.SourcesDirectory)\artifacts\OptProf\$(BuildConfiguration)\Data'
+      sourcePath: '$(System.DefaultWorkingDirectory)\artifacts\OptProf\$(BuildConfiguration)\Data'
       toLowerCase: false
       usePat: false
     displayName: 'OptProf - Publish to Artifact Services - ProfilingInputs'
@@ -847,7 +847,7 @@ The following build definition steps are required for successful generation of a
       vsMajorVersion: $(VisualStudio.MajorVersion)
       channelName: $(VisualStudio.ChannelName)
       manifests: $(VisualStudio.SetupManifestList)
-      outputFolder: '$(Build.SourcesDirectory)\artifacts\VSSetup\$(BuildConfiguration)\Insertion'
+      outputFolder: '$(System.DefaultWorkingDirectory)\artifacts\VSSetup\$(BuildConfiguration)\Insertion'
     displayName: 'OptProf - Build VS bootstrapper'
     condition: succeeded()
 
diff --git a/Documentation/AzureDevOps/PhaseToJobSchemaChange.md b/Documentation/AzureDevOps/PhaseToJobSchemaChange.md
index 39cf0a9dde4..fbaec6a0c02 100644
--- a/Documentation/AzureDevOps/PhaseToJobSchemaChange.md
+++ b/Documentation/AzureDevOps/PhaseToJobSchemaChange.md
@@ -188,7 +188,7 @@ phases:
     - task: PublishBuildArtifacts@1
       displayName: Publish Logs to VSTS
       inputs:
-        PathtoPublish: '$(Build.SourcesDirectory)/artifacts/log/$(_BuildConfig)'
+        PathtoPublish: '$(System.DefaultWorkingDirectory)/artifacts/log/$(_BuildConfig)'
         PublishLocation: Container
         ArtifactName: $(Agent.Os)_$(Agent.JobName)
       continueOnError: true
@@ -276,7 +276,7 @@ phases:
     - task: PublishBuildArtifacts@1
       displayName: Publish Logs to VSTS
       inputs:
-        PathtoPublish: '$(Build.SourcesDirectory)/artifacts/log/$(_BuildConfig)'
+        PathtoPublish: '$(System.DefaultWorkingDirectory)/artifacts/log/$(_BuildConfig)'
         PublishLocation: Container
         ArtifactName: $(Agent.Os)_$(Agent.JobName)
       continueOnError: true
diff --git a/Documentation/AzureDevOps/SendingJobsToHelix.md b/Documentation/AzureDevOps/SendingJobsToHelix.md
index c52c68e27ff..7f2cba14e93 100644
--- a/Documentation/AzureDevOps/SendingJobsToHelix.md
+++ b/Documentation/AzureDevOps/SendingJobsToHelix.md
@@ -100,7 +100,7 @@ The list of available Helix queues can be found on the [Helix homepage](https://
       # HelixConfiguration: '' -- any property that you would like to attached to a job
       # HelixPreCommands: '' -- any commands that you would like to run prior to running your job
       # HelixPostCommands: '' -- any commands that you would like to run after running your job
-      XUnitProjects: $(Build.SourcesDirectory)/HelloTests/HelloTests.csproj # specify your xUnit projects (semicolon delimited) here!
+      XUnitProjects: $(System.DefaultWorkingDirectory)/HelloTests/HelloTests.csproj # specify your xUnit projects (semicolon delimited) here!
       # XUnitWorkItemTimeout: '00:05:00' -- a timeout (specified as a System.TimeSpan string) for all work items created from XUnitProjects
       XUnitPublishTargetFramework: netcoreapp3.1 # specify your publish target framework here
       XUnitRuntimeTargetFramework: netcoreapp2.0 # specify the framework you want to use for the xUnit runner
diff --git a/Documentation/DependencyFlowOnboardingWithoutArcade.md b/Documentation/DependencyFlowOnboardingWithoutArcade.md
index 6b8549e3c75..7a496996162 100644
--- a/Documentation/DependencyFlowOnboardingWithoutArcade.md
+++ b/Documentation/DependencyFlowOnboardingWithoutArcade.md
@@ -78,7 +78,7 @@ If you only have one Azure DevOps job that publishes assets, then you can add th
     azureSubscription: "Darc: Maestro Production"
     scriptType: ps
     scriptLocation: scriptPath
-    scriptPath: $(Build.SourcesDirectory)/eng/common/sdk-task.ps1
+    scriptPath: $(System.DefaultWorkingDirectory)/eng/common/sdk-task.ps1
     arguments: -task PublishBuildAssets
       -restore
       -msbuildEngine dotnet
diff --git a/Documentation/HowToAddPerfTestingToPipeline.md b/Documentation/HowToAddPerfTestingToPipeline.md
index ec8c55009f0..cb3155519e8 100644
--- a/Documentation/HowToAddPerfTestingToPipeline.md
+++ b/Documentation/HowToAddPerfTestingToPipeline.md
@@ -103,7 +103,7 @@ Performance testing has been fully tested in coreclr. Coreclr, corefx and other
 
     # Test job depends on the corresponding build job
     dependsOn: build_Windows_NT_x64_Release
-    extraSetupParameters: -CoreRootDirectory $(Build.SourcesDirectory)\bin\tests\Windows_NT.x64.Release\Tests\Core_Root -Architecture x64
+    extraSetupParameters: -CoreRootDirectory $(System.DefaultWorkingDirectory)\bin\tests\Windows_NT.x64.Release\Tests\Core_Root -Architecture x64
 
     steps:
     # Download product build
@@ -121,7 +121,7 @@ Performance testing has been fully tested in coreclr. Coreclr, corefx and other
       inputs:
         sourceFolder: $(System.ArtifactsDirectory)/Windows_NT_x64_Release_build
         contents: '**'
-        targetFolder: $(Build.SourcesDirectory)/bin/Product/Windows_NT.x64.Release
+        targetFolder: $(System.DefaultWorkingDirectory)/bin/Product/Windows_NT.x64.Release
 
     # Create Core_Root
     - script: build-test.cmd Release x64 skipmanaged skipnative
diff --git a/Documentation/OneLocBuild.md b/Documentation/OneLocBuild.md
index 7c1fc973988..cce7faf1e79 100644
--- a/Documentation/OneLocBuild.md
+++ b/Documentation/OneLocBuild.md
@@ -180,7 +180,7 @@ The parameters that can be passed to the template are as follows:
 | **Parameter** | **Default Value** | **Notes** |
 |:-:|:-:|-|
 | `RepoType` | `'gitHub'` | Should be set to `'gitHub'` for GitHub-based repositories and `'azureDevOps'` for Azure DevOps-based ones. |
-| `SourcesDirectory` | `$(Build.SourcesDirectory)` | This is the root directory for your repository source code. |
+| `SourcesDirectory` | `$(System.DefaultWorkingDirectory)` | This is the root directory for your repository source code. |
 | `CreatePr` | `true` | When set to `true`, instructs the OneLocBuild task to make a PR back to the source repository containing the localized files. |
 | `AutoCompletePr` | `false` | When set to `true`, instructs the OneLocBuild task to autocomplete the created PR. Requires permissions to bypass any checks on the main branch. |
 | `ReusePr` | `true` | When set to `true`, instructs the OneLocBuild task to update an existing PR (if one exists) rather than open a new one to reduce PR noise. |
diff --git a/Documentation/Projects/Build Analysis/BuildRetryOnboard.md b/Documentation/Projects/Build Analysis/BuildRetryOnboard.md
index 5957d260cc3..94e7f23b4a7 100644
--- a/Documentation/Projects/Build Analysis/BuildRetryOnboard.md	
+++ b/Documentation/Projects/Build Analysis/BuildRetryOnboard.md	
@@ -19,7 +19,7 @@ Ex. \eng\BuildConfiguration\build-configuration.json
 
 	Ex.
 	``` 
-	- publish: $(Build.SourcesDirectory)\eng\BuildConfiguration
+	- publish: $(System.DefaultWorkingDirectory)\eng\BuildConfiguration
 	  artifact: BuildConfiguration
 	``` 
 
diff --git a/Documentation/SBOMGenerationGuidance.md b/Documentation/SBOMGenerationGuidance.md
index e276b42944c..f264350cfbd 100644
--- a/Documentation/SBOMGenerationGuidance.md
+++ b/Documentation/SBOMGenerationGuidance.md
@@ -76,7 +76,7 @@ Arcade configurations. The template allows customization of behavior via the fol
 - `ManifestDirPath`: Determines where in the build agent the SBOM will be generated to, defaults to
   `$(Build.ArtifactStagingDirectory)/sbom`
 - `BuildDropPath` : Determines the directory that the SBOM tooling will use to find build outputs.
-  Defaults to $`(Build.SourcesDirectory)/artifacts` to match Arcade's convention. 
+  Defaults to $`(System.DefaultWorkingDirectory)/artifacts` to match Arcade's convention. 
 - `sbomContinueOnError`: By default the tasks are set up to not break the build and instead continue
   on error if anything goes wrong in the generation process.
 
@@ -244,7 +244,7 @@ for your release builds:
   ```
 
   It means that your build outputs might not match with the expected location for Arcade:
-  `$(Build.SourcesDirectory)/Artifacts`. In this case you should modify the `BuildDropPath`
+  `$(System.DefaultWorkingDirectory)/Artifacts`. In this case you should modify the `BuildDropPath`
   parameter of the template to point to your build's output directory. 
 
 - For any other problems with the tasks or templates, you can reach out to the [.NET Engineering
diff --git a/azure-pipelines-pr.yml b/azure-pipelines-pr.yml
index 72fb909f7b1..a488d9e3529 100644
--- a/azure-pipelines-pr.yml
+++ b/azure-pipelines-pr.yml
@@ -165,7 +165,7 @@ stages:
               /p:DotNetSymbolServerTokenSymWeb=DryRunPTA
               /p:PDBArtifactsDirectory='$(Build.ArtifactStagingDirectory)/PDBArtifacts/'
               /p:BlobBasePath='$(Build.ArtifactStagingDirectory)/BlobArtifacts/'
-              /p:SymbolPublishingExclusionsFile='$(Build.SourcesDirectory)/eng/SymbolPublishingExclusionsFile.txt'
+              /p:SymbolPublishingExclusionsFile='$(System.DefaultWorkingDirectory)/eng/SymbolPublishingExclusionsFile.txt'
               /p:Configuration=Release
               /p:PublishToMSDL=false
         - powershell: eng\common\build.ps1
@@ -175,8 +175,8 @@ stages:
             -restore
             -test
             -warnAsError $false
-            -projects $(Build.SourcesDirectory)\tests\UnitTests.proj
-            /bl:$(Build.SourcesDirectory)\artifacts\log\$(_BuildConfig)\Helix.binlog
+            -projects $(System.DefaultWorkingDirectory)\tests\UnitTests.proj
+            /bl:$(System.DefaultWorkingDirectory)\artifacts\log\$(_BuildConfig)\Helix.binlog
             /p:RestoreUsingNuGetTargets=false
           displayName: Run Helix Tests
           env:
@@ -205,8 +205,8 @@ stages:
             --restore
             --test
             --warnAsError false
-            --projects $(Build.SourcesDirectory)/tests/UnitTests.proj
-            /bl:$(Build.SourcesDirectory)/artifacts/log/$(_BuildConfig)/Helix.binlog
+            --projects $(System.DefaultWorkingDirectory)/tests/UnitTests.proj
+            /bl:$(System.DefaultWorkingDirectory)/artifacts/log/$(_BuildConfig)/Helix.binlog
             /p:RestoreUsingNuGetTargets=false
           displayName: Run Helix Tests
           env:
@@ -250,8 +250,8 @@ stages:
             -restore
             -test
             -warnAsError false
-            -projects $(Build.SourcesDirectory)/tests/XHarness.Apple.SimulatorTests.proj
-            /bl:$(Build.SourcesDirectory)/artifacts/log/$(_BuildConfig)/XHarness.Apple.Simulator.Tests.binlog
+            -projects $(System.DefaultWorkingDirectory)/tests/XHarness.Apple.SimulatorTests.proj
+            /bl:$(System.DefaultWorkingDirectory)/artifacts/log/$(_BuildConfig)/XHarness.Apple.Simulator.Tests.binlog
             /p:RestoreUsingNuGetTargets=false
           displayName: XHarness Apple Simulator Helix Testing
           env:
@@ -280,8 +280,8 @@ stages:
             -restore
             -test
             -warnAsError false
-            -projects $(Build.SourcesDirectory)/tests/XHarness.Apple.DeviceTests.proj
-            /bl:$(Build.SourcesDirectory)/artifacts/log/$(_BuildConfig)/Helix.XHarness.Apple.Device.Tests.binlog
+            -projects $(System.DefaultWorkingDirectory)/tests/XHarness.Apple.DeviceTests.proj
+            /bl:$(System.DefaultWorkingDirectory)/artifacts/log/$(_BuildConfig)/Helix.XHarness.Apple.Device.Tests.binlog
             /p:RestoreUsingNuGetTargets=false
           displayName: XHarness Apple Device Helix Testing
           env:
@@ -310,8 +310,8 @@ stages:
             -restore
             -test
             -warnAsError false
-            -projects $(Build.SourcesDirectory)/tests/XHarness.Android.SimulatorTests.proj
-            /bl:$(Build.SourcesDirectory)/artifacts/log/$(_BuildConfig)/Helix.XHarness.Android.Simulator.Tests.binlog
+            -projects $(System.DefaultWorkingDirectory)/tests/XHarness.Android.SimulatorTests.proj
+            /bl:$(System.DefaultWorkingDirectory)/artifacts/log/$(_BuildConfig)/Helix.XHarness.Android.Simulator.Tests.binlog
             /p:RestoreUsingNuGetTargets=false
           displayName: XHarness Android Helix Testing (Linux)
           env:
@@ -339,8 +339,8 @@ stages:
             -restore
             -test
             -warnAsError $false
-            -projects $(Build.SourcesDirectory)\tests\XHarness.Android.DeviceTests.proj
-            /bl:$(Build.SourcesDirectory)\artifacts\log\$(_BuildConfig)\Helix.XHarness.Android.Device.Tests.binlog
+            -projects $(System.DefaultWorkingDirectory)\tests\XHarness.Android.DeviceTests.proj
+            /bl:$(System.DefaultWorkingDirectory)\artifacts\log\$(_BuildConfig)\Helix.XHarness.Android.Device.Tests.binlog
             /p:RestoreUsingNuGetTargets=false
           displayName: XHarness Android Helix Testing (Windows)
           env:
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 74970e0a77b..cb402221699 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -124,4 +124,4 @@ extends:
           -TsaRepositoryName "Arcade"
           -TsaCodebaseName "Arcade"
           -TsaPublish $True
-          -PoliCheckAdditionalRunConfigParams @("UserExclusionPath < $(Build.SourcesDirectory)/eng/PoliCheckExclusions.xml")'
\ No newline at end of file
+          -PoliCheckAdditionalRunConfigParams @("UserExclusionPath < $(System.DefaultWorkingDirectory)/eng/PoliCheckExclusions.xml")'
\ No newline at end of file
diff --git a/eng/common/SetupNugetSources.ps1 b/eng/common/SetupNugetSources.ps1
index efa2fd72bfa..59b2d55e1a3 100644
--- a/eng/common/SetupNugetSources.ps1
+++ b/eng/common/SetupNugetSources.ps1
@@ -17,8 +17,8 @@
 #    displayName: Setup Private Feeds Credentials
 #    condition: eq(variables['Agent.OS'], 'Windows_NT')
 #    inputs:
-#      filePath: $(Build.SourcesDirectory)/eng/common/SetupNugetSources.ps1
-#      arguments: -ConfigFile $(Build.SourcesDirectory)/NuGet.config -Password $Env:Token
+#      filePath: $(System.DefaultWorkingDirectory)/eng/common/SetupNugetSources.ps1
+#      arguments: -ConfigFile $(System.DefaultWorkingDirectory)/NuGet.config -Password $Env:Token
 #    env:
 #      Token: $(dn-bot-dnceng-artifact-feeds-rw)
 
diff --git a/eng/common/SetupNugetSources.sh b/eng/common/SetupNugetSources.sh
index d387c7eac95..c0e7bbef21c 100755
--- a/eng/common/SetupNugetSources.sh
+++ b/eng/common/SetupNugetSources.sh
@@ -18,8 +18,8 @@
 #  - task: Bash@3
 #    displayName: Setup Private Feeds Credentials
 #    inputs:
-#      filePath: $(Build.SourcesDirectory)/eng/common/SetupNugetSources.sh
-#      arguments: $(Build.SourcesDirectory)/NuGet.config $Token
+#      filePath: $(System.DefaultWorkingDirectory)/eng/common/SetupNugetSources.sh
+#      arguments: $(System.DefaultWorkingDirectory)/NuGet.config $Token
 #    condition: ne(variables['Agent.OS'], 'Windows_NT')
 #    env:
 #      Token: $(dn-bot-dnceng-artifact-feeds-rw)
diff --git a/eng/common/templates-official/job/job.yml b/eng/common/templates-official/job/job.yml
index b98f6a6505d..4cca1114fcc 100644
--- a/eng/common/templates-official/job/job.yml
+++ b/eng/common/templates-official/job/job.yml
@@ -38,7 +38,7 @@ parameters:
 # Sbom related params
   enableSbom: true
   PackageVersion: 7.0.0
-  BuildDropPath: '$(Build.SourcesDirectory)/artifacts'
+  BuildDropPath: '$(System.DefaultWorkingDirectory)/artifacts'
   ManifestDirPath: $(Build.ArtifactStagingDirectory)/sbom
 
 jobs:
@@ -167,7 +167,7 @@ jobs:
       inputs:
         languages: ${{ coalesce(parameters.richCodeNavigationLanguage, 'csharp') }}
         environment: ${{ coalesce(parameters.richCodeNavigationEnvironment, 'production') }}
-        richNavLogOutputDirectory: $(Build.SourcesDirectory)/artifacts/bin
+        richNavLogOutputDirectory: $(System.DefaultWorkingDirectory)/artifacts/bin
         uploadRichNavArtifacts: ${{ coalesce(parameters.richCodeNavigationUploadArtifacts, false) }}
       continueOnError: true
 
@@ -226,7 +226,7 @@ jobs:
     - task: 1ES.PublishBuildArtifacts@1
       displayName: Publish Logs
       inputs:
-        PathtoPublish: '$(Build.SourcesDirectory)/artifacts/log/$(_BuildConfig)'
+        PathtoPublish: '$(System.DefaultWorkingDirectory)/artifacts/log/$(_BuildConfig)'
         PublishLocation: Container
         ArtifactName: ${{ coalesce(parameters.enablePublishBuildArtifacts.artifactName, '$(Agent.Os)_$(Agent.JobName)' ) }}
       continueOnError: true
@@ -238,7 +238,7 @@ jobs:
       inputs:
         testResultsFormat: 'xUnit'
         testResultsFiles: '*.xml'
-        searchFolder: '$(Build.SourcesDirectory)/artifacts/TestResults/$(_BuildConfig)'
+        searchFolder: '$(System.DefaultWorkingDirectory)/artifacts/TestResults/$(_BuildConfig)'
         testRunTitle: ${{ coalesce(parameters.testRunTitle, parameters.name, '$(System.JobName)') }}-xunit
         mergeTestResults: ${{ parameters.mergeTestResults }}
       continueOnError: true
@@ -249,7 +249,7 @@ jobs:
       inputs:
         testResultsFormat: 'VSTest'
         testResultsFiles: '*.trx'
-        searchFolder: '$(Build.SourcesDirectory)/artifacts/TestResults/$(_BuildConfig)'
+        searchFolder: '$(System.DefaultWorkingDirectory)/artifacts/TestResults/$(_BuildConfig)'
         testRunTitle: ${{ coalesce(parameters.testRunTitle, parameters.name, '$(System.JobName)') }}-trx
         mergeTestResults: ${{ parameters.mergeTestResults }}
       continueOnError: true
@@ -265,7 +265,7 @@ jobs:
   - ${{ if eq(parameters.enableBuildRetry, 'true') }}:
     - task: 1ES.PublishPipelineArtifact@1
       inputs:
-        targetPath: '$(Build.SourcesDirectory)\eng\common\BuildConfiguration'
+        targetPath: '$(System.DefaultWorkingDirectory)\eng\common\BuildConfiguration'
         artifactName: 'BuildConfiguration'
       displayName: 'Publish build retry configuration'
       continueOnError: true
diff --git a/eng/common/templates-official/job/onelocbuild.yml b/eng/common/templates-official/job/onelocbuild.yml
index 52b4d05d3f8..68e7a65605c 100644
--- a/eng/common/templates-official/job/onelocbuild.yml
+++ b/eng/common/templates-official/job/onelocbuild.yml
@@ -8,7 +8,7 @@ parameters:
   CeapexPat: $(dn-bot-ceapex-package-r) # PAT for the loc AzDO instance https://dev.azure.com/ceapex
   GithubPat: $(BotAccount-dotnet-bot-repo-PAT)
 
-  SourcesDirectory: $(Build.SourcesDirectory)
+  SourcesDirectory: $(System.DefaultWorkingDirectory)
   CreatePr: true
   AutoCompletePr: false
   ReusePr: true
@@ -63,7 +63,7 @@ jobs:
     - ${{ if ne(parameters.SkipLocProjectJsonGeneration, 'true') }}:
       - task: Powershell@2
         inputs:
-          filePath: $(Build.SourcesDirectory)/eng/common/generate-locproject.ps1
+          filePath: $(System.DefaultWorkingDirectory)/eng/common/generate-locproject.ps1
           arguments: $(_GenerateLocProjectArguments)
         displayName: Generate LocProject.json
         condition: ${{ parameters.condition }}
@@ -106,7 +106,7 @@ jobs:
     - task: 1ES.PublishBuildArtifacts@1
       displayName: Publish LocProject.json
       inputs:
-        PathtoPublish: '$(Build.SourcesDirectory)/eng/Localize/'
+        PathtoPublish: '$(System.DefaultWorkingDirectory)/eng/Localize/'
         PublishLocation: Container
         ArtifactName: Loc
       condition: ${{ parameters.condition }}
\ No newline at end of file
diff --git a/eng/common/templates-official/job/publish-build-assets.yml b/eng/common/templates-official/job/publish-build-assets.yml
index b2ccd9df680..7a320e9bab2 100644
--- a/eng/common/templates-official/job/publish-build-assets.yml
+++ b/eng/common/templates-official/job/publish-build-assets.yml
@@ -30,6 +30,8 @@ parameters:
 
   signingValidationAdditionalParameters: ''
 
+  repositoryAlias: self
+
 jobs:
 - job: Asset_Registry_Publish
 
@@ -65,6 +67,9 @@ jobs:
       os: windows
   steps:
   - ${{ if and(eq(parameters.runAsPublic, 'false'), ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}:
+    - checkout: ${{ parameters.repositoryAlias }}
+      fetchDepth: 3
+      clean: true
     - task: DownloadBuildArtifacts@0
       displayName: Download artifact
       inputs:
@@ -82,7 +87,7 @@ jobs:
         azureSubscription: "Darc: Maestro Production"
         scriptType: ps
         scriptLocation: scriptPath
-        scriptPath: $(Build.SourcesDirectory)/eng/common/sdk-task.ps1
+        scriptPath: $(System.DefaultWorkingDirectory)/eng/common/sdk-task.ps1
         arguments: >
           -task PublishBuildAssets -restore -msbuildEngine dotnet
           /p:ManifestsPath='$(Build.StagingDirectory)/Download/AssetManifests'
@@ -115,7 +120,7 @@ jobs:
       inputs:
         targetType: inline
         script: |
-          $symbolExclusionfile = "$(Build.SourcesDirectory)/eng/SymbolPublishingExclusionsFile.txt"
+          $symbolExclusionfile = "$(System.DefaultWorkingDirectory)/eng/SymbolPublishingExclusionsFile.txt"
           if(Test-Path -Path $symbolExclusionfile)
           {
             Write-Host "SymbolExclusionFile exists"
@@ -130,7 +135,7 @@ jobs:
       displayName: Publish SymbolPublishingExclusionsFile Artifact
       condition: eq(variables['SymbolExclusionFile'], 'true') 
       inputs:
-        PathtoPublish: '$(Build.SourcesDirectory)/eng/SymbolPublishingExclusionsFile.txt'
+        PathtoPublish: '$(System.DefaultWorkingDirectory)/eng/SymbolPublishingExclusionsFile.txt'
         PublishLocation: Container
         ArtifactName: ReleaseConfigs
 
@@ -146,7 +151,7 @@ jobs:
           azureSubscription: "Darc: Maestro Production"
           scriptType: ps
           scriptLocation: scriptPath
-          scriptPath: $(Build.SourcesDirectory)/eng/common/post-build/publish-using-darc.ps1
+          scriptPath: $(System.DefaultWorkingDirectory)/eng/common/post-build/publish-using-darc.ps1
           arguments: -BuildId $(BARBuildId)
             -PublishingInfraVersion 3
             -AzdoToken '$(System.AccessToken)'
diff --git a/eng/common/templates-official/job/source-index-stage1.yml b/eng/common/templates-official/job/source-index-stage1.yml
index fb632b71a25..0579e692fc8 100644
--- a/eng/common/templates-official/job/source-index-stage1.yml
+++ b/eng/common/templates-official/job/source-index-stage1.yml
@@ -59,7 +59,7 @@ jobs:
   - script: ${{ parameters.sourceIndexBuildCommand }}
     displayName: Build Repository
 
-  - script: $(Agent.TempDirectory)/.source-index/tools/BinLogToSln -i $(BinlogPath) -r $(Build.SourcesDirectory) -n $(Build.Repository.Name) -o .source-index/stage1output
+  - script: $(Agent.TempDirectory)/.source-index/tools/BinLogToSln -i $(BinlogPath) -r $(System.DefaultWorkingDirectory) -n $(Build.Repository.Name) -o .source-index/stage1output
     displayName: Process Binlog into indexable sln
 
   - ${{ if and(eq(parameters.runAsPublic, 'false'), ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}:
diff --git a/eng/common/templates-official/jobs/codeql-build.yml b/eng/common/templates-official/jobs/codeql-build.yml
index b68d3c2f319..f6476912a86 100644
--- a/eng/common/templates-official/jobs/codeql-build.yml
+++ b/eng/common/templates-official/jobs/codeql-build.yml
@@ -23,7 +23,7 @@ jobs:
       - name: DefaultGuardianVersion
         value: 0.109.0
       - name: GuardianPackagesConfigFile
-        value: $(Build.SourcesDirectory)\eng\common\sdl\packages.config
+        value: $(System.DefaultWorkingDirectory)\eng\common\sdl\packages.config
       - name: GuardianVersion
         value: ${{ coalesce(parameters.overrideGuardianVersion, '$(DefaultGuardianVersion)') }}
   
diff --git a/eng/common/templates-official/jobs/jobs.yml b/eng/common/templates-official/jobs/jobs.yml
index 857a0f8ba43..803a95aacf4 100644
--- a/eng/common/templates-official/jobs/jobs.yml
+++ b/eng/common/templates-official/jobs/jobs.yml
@@ -40,6 +40,7 @@ parameters:
 
   enableSourceIndex: false
   sourceIndexParams: {}
+  repositoryAlias: self
 
 # Internal resources (telemetry, microbuild) can only be accessed from non-public projects,
 # and some (Microbuild) should only be applied to non-PR cases for internal builds.
@@ -95,3 +96,4 @@ jobs:
         enablePublishBuildArtifacts: ${{ parameters.enablePublishBuildArtifacts }}
         artifactsPublishingAdditionalParameters: ${{ parameters.artifactsPublishingAdditionalParameters }}
         signingValidationAdditionalParameters: ${{ parameters.signingValidationAdditionalParameters }}
+        repositoryAlias: ${{ parameters.repositoryAlias }}
diff --git a/eng/common/templates-official/post-build/post-build.yml b/eng/common/templates-official/post-build/post-build.yml
index b81b8770b34..9fef8103991 100644
--- a/eng/common/templates-official/post-build/post-build.yml
+++ b/eng/common/templates-official/post-build/post-build.yml
@@ -133,7 +133,7 @@ stages:
         - task: PowerShell@2
           displayName: Validate
           inputs:
-            filePath: $(Build.SourcesDirectory)/eng/common/post-build/nuget-validation.ps1
+            filePath: $(System.DefaultWorkingDirectory)/eng/common/post-build/nuget-validation.ps1
             arguments: -PackagesPath $(Build.ArtifactStagingDirectory)/PackageArtifacts/ 
               -ToolDestinationPath $(Agent.BuildDirectory)/Extract/ 
 
@@ -186,7 +186,7 @@ stages:
             filePath: eng\common\sdk-task.ps1
             arguments: -task SigningValidation -restore -msbuildEngine vs
               /p:PackageBasePath='$(Build.ArtifactStagingDirectory)/PackageArtifacts'
-              /p:SignCheckExclusionsFile='$(Build.SourcesDirectory)/eng/SignCheckExclusionsFile.txt'
+              /p:SignCheckExclusionsFile='$(System.DefaultWorkingDirectory)/eng/SignCheckExclusionsFile.txt'
               ${{ parameters.signingValidationAdditionalParameters }}
 
         - template: ../steps/publish-logs.yml
@@ -230,7 +230,7 @@ stages:
         - task: PowerShell@2
           displayName: Validate
           inputs:
-            filePath: $(Build.SourcesDirectory)/eng/common/post-build/sourcelink-validation.ps1
+            filePath: $(System.DefaultWorkingDirectory)/eng/common/post-build/sourcelink-validation.ps1
             arguments: -InputPath $(Build.ArtifactStagingDirectory)/BlobArtifacts/ 
               -ExtractPath $(Agent.BuildDirectory)/Extract/ 
               -GHRepoName $(Build.Repository.Name) 
@@ -278,7 +278,7 @@ stages:
             azureSubscription: "Darc: Maestro Production"
             scriptType: ps
             scriptLocation: scriptPath
-            scriptPath: $(Build.SourcesDirectory)/eng/common/post-build/publish-using-darc.ps1
+            scriptPath: $(System.DefaultWorkingDirectory)/eng/common/post-build/publish-using-darc.ps1
             arguments: -BuildId $(BARBuildId) 
               -PublishingInfraVersion ${{ parameters.publishingInfraVersion }}
               -AzdoToken '$(System.AccessToken)'
diff --git a/eng/common/templates-official/post-build/trigger-subscription.yml b/eng/common/templates-official/post-build/trigger-subscription.yml
index da669030daf..52df7077482 100644
--- a/eng/common/templates-official/post-build/trigger-subscription.yml
+++ b/eng/common/templates-official/post-build/trigger-subscription.yml
@@ -5,7 +5,7 @@ steps:
 - task: PowerShell@2
   displayName: Triggering subscriptions
   inputs:
-    filePath: $(Build.SourcesDirectory)/eng/common/post-build/trigger-subscriptions.ps1
+    filePath: $(System.DefaultWorkingDirectory)/eng/common/post-build/trigger-subscriptions.ps1
     arguments: -SourceRepo $(Build.Repository.Uri)
       -ChannelId ${{ parameters.ChannelId }}
       -MaestroApiAccessToken $(MaestroAccessToken)
diff --git a/eng/common/templates-official/steps/add-build-to-channel.yml b/eng/common/templates-official/steps/add-build-to-channel.yml
index f67a210d62f..5b6fec257ea 100644
--- a/eng/common/templates-official/steps/add-build-to-channel.yml
+++ b/eng/common/templates-official/steps/add-build-to-channel.yml
@@ -5,7 +5,7 @@ steps:
 - task: PowerShell@2
   displayName: Add Build to Channel
   inputs:
-    filePath: $(Build.SourcesDirectory)/eng/common/post-build/add-build-to-channel.ps1
+    filePath: $(System.DefaultWorkingDirectory)/eng/common/post-build/add-build-to-channel.ps1
     arguments: -BuildId $(BARBuildId) 
       -ChannelId ${{ parameters.ChannelId }}
       -MaestroApiAccessToken $(MaestroApiAccessToken)
diff --git a/eng/common/templates-official/steps/execute-sdl.yml b/eng/common/templates-official/steps/execute-sdl.yml
index 301d5c591eb..d9dcd1e1cde 100644
--- a/eng/common/templates-official/steps/execute-sdl.yml
+++ b/eng/common/templates-official/steps/execute-sdl.yml
@@ -15,17 +15,17 @@ steps:
   
 - ${{ if ne(parameters.overrideGuardianVersion, '') }}:
   - pwsh: |
-      Set-Location -Path $(Build.SourcesDirectory)\eng\common\sdl
+      Set-Location -Path $(System.DefaultWorkingDirectory)\eng\common\sdl
       . .\sdl.ps1
-      $guardianCliLocation = Install-Gdn -Path $(Build.SourcesDirectory)\.artifacts -Version ${{ parameters.overrideGuardianVersion }}
+      $guardianCliLocation = Install-Gdn -Path $(System.DefaultWorkingDirectory)\.artifacts -Version ${{ parameters.overrideGuardianVersion }}
       Write-Host "##vso[task.setvariable variable=GuardianCliLocation]$guardianCliLocation"
     displayName: Install Guardian (Overridden)
 
 - ${{ if eq(parameters.overrideGuardianVersion, '') }}:
   - pwsh: |
-      Set-Location -Path $(Build.SourcesDirectory)\eng\common\sdl
+      Set-Location -Path $(System.DefaultWorkingDirectory)\eng\common\sdl
       . .\sdl.ps1
-      $guardianCliLocation = Install-Gdn -Path $(Build.SourcesDirectory)\.artifacts
+      $guardianCliLocation = Install-Gdn -Path $(System.DefaultWorkingDirectory)\.artifacts
       Write-Host "##vso[task.setvariable variable=GuardianCliLocation]$guardianCliLocation"
     displayName: Install Guardian
 
@@ -38,7 +38,7 @@ steps:
 - ${{ if eq(parameters.overrideParameters, '') }}:
   - powershell: ${{ parameters.executeAllSdlToolsScript }}
       -GuardianCliLocation $(GuardianCliLocation)
-      -NugetPackageDirectory $(Build.SourcesDirectory)\.packages
+      -NugetPackageDirectory $(System.DefaultWorkingDirectory)\.packages
       -AzureDevOpsAccessToken $(dn-bot-dotnet-build-rw-code-rw)
       ${{ parameters.additionalParameters }}
     displayName: Execute SDL
@@ -73,7 +73,7 @@ steps:
       flattenFolders: true
       sourceFolder:  $(Agent.BuildDirectory)/.gdn/rc/
       contents: '**/*.sarif'
-      targetFolder: $(Build.SourcesDirectory)/CodeAnalysisLogs
+      targetFolder: $(System.DefaultWorkingDirectory)/CodeAnalysisLogs
     condition: succeededOrFailed()
 
   # Use PublishBuildArtifacts because the SARIF extension only checks this case
@@ -81,6 +81,6 @@ steps:
   - task: PublishBuildArtifacts@1
     displayName: Publish SARIF files to CodeAnalysisLogs container
     inputs:
-      pathToPublish:  $(Build.SourcesDirectory)/CodeAnalysisLogs
+      pathToPublish:  $(System.DefaultWorkingDirectory)/CodeAnalysisLogs
       artifactName: CodeAnalysisLogs
     condition: succeededOrFailed()
\ No newline at end of file
diff --git a/eng/common/templates-official/steps/generate-sbom.yml b/eng/common/templates-official/steps/generate-sbom.yml
index daf0957b68d..1536353566c 100644
--- a/eng/common/templates-official/steps/generate-sbom.yml
+++ b/eng/common/templates-official/steps/generate-sbom.yml
@@ -6,7 +6,7 @@
 
 parameters:
   PackageVersion: 8.0.0
-  BuildDropPath: '$(Build.SourcesDirectory)/artifacts'
+  BuildDropPath: '$(System.DefaultWorkingDirectory)/artifacts'
   PackageName: '.NET'
   ManifestDirPath: $(Build.ArtifactStagingDirectory)/sbom
   IgnoreDirectories: ''
diff --git a/eng/common/templates-official/steps/publish-logs.yml b/eng/common/templates-official/steps/publish-logs.yml
index 04012fed182..af5a40b64c4 100644
--- a/eng/common/templates-official/steps/publish-logs.yml
+++ b/eng/common/templates-official/steps/publish-logs.yml
@@ -8,15 +8,15 @@ steps:
   inputs:
     targetType: inline
     script: |
-      New-Item -ItemType Directory $(Build.SourcesDirectory)/PostBuildLogs/${{parameters.StageLabel}}/${{parameters.JobLabel}}/
-      Move-Item -Path $(Build.SourcesDirectory)/artifacts/log/Debug/* $(Build.SourcesDirectory)/PostBuildLogs/${{parameters.StageLabel}}/${{parameters.JobLabel}}/
+      New-Item -ItemType Directory $(System.DefaultWorkingDirectory)/PostBuildLogs/${{parameters.StageLabel}}/${{parameters.JobLabel}}/
+      Move-Item -Path $(System.DefaultWorkingDirectory)/artifacts/log/Debug/* $(System.DefaultWorkingDirectory)/PostBuildLogs/${{parameters.StageLabel}}/${{parameters.JobLabel}}/
   continueOnError: true
   condition: always()
 
 - task: 1ES.PublishBuildArtifacts@1
   displayName: Publish Logs
   inputs:
-    PathtoPublish: '$(Build.SourcesDirectory)/PostBuildLogs'
+    PathtoPublish: '$(System.DefaultWorkingDirectory)/PostBuildLogs'
     PublishLocation: Container
     ArtifactName: PostBuildLogs
   continueOnError: true
diff --git a/eng/common/templates-official/steps/source-build.yml b/eng/common/templates-official/steps/source-build.yml
index 829f17c34d1..a69631446da 100644
--- a/eng/common/templates-official/steps/source-build.yml
+++ b/eng/common/templates-official/steps/source-build.yml
@@ -26,8 +26,8 @@ steps:
     internalRestoreArgs=
     if [ '$(dn-bot-dnceng-artifact-feeds-rw)' != '$''(dn-bot-dnceng-artifact-feeds-rw)' ]; then
       # Temporarily work around https://github.com/dotnet/arcade/issues/7709
-      chmod +x $(Build.SourcesDirectory)/eng/common/SetupNugetSources.sh
-      $(Build.SourcesDirectory)/eng/common/SetupNugetSources.sh $(Build.SourcesDirectory)/NuGet.config $(dn-bot-dnceng-artifact-feeds-rw)
+      chmod +x $(System.DefaultWorkingDirectory)/eng/common/SetupNugetSources.sh
+      $(System.DefaultWorkingDirectory)/eng/common/SetupNugetSources.sh $(System.DefaultWorkingDirectory)/NuGet.config $(dn-bot-dnceng-artifact-feeds-rw)
       internalRestoreArgs='/p:CopyWipIntoInnerSourceBuildRepo=true'
 
       # The 'Copy WIP' feature of source build uses git stash to apply changes from the original repo.
@@ -101,7 +101,7 @@ steps:
 - task: CopyFiles@2
   displayName: Prepare BuildLogs staging directory
   inputs:
-    SourceFolder: '$(Build.SourcesDirectory)'
+    SourceFolder: '$(System.DefaultWorkingDirectory)'
     Contents: |
       **/*.log
       **/*.binlog
@@ -126,4 +126,4 @@ steps:
 - task: ComponentGovernanceComponentDetection@0
   displayName: Component Detection (Exclude upstream cache)
   inputs:
-    ignoreDirectories: '$(Build.SourcesDirectory)/artifacts/source-build/self/src/artifacts/obj/source-built-upstream-cache'
+    ignoreDirectories: '$(System.DefaultWorkingDirectory)/artifacts/source-build/self/src/artifacts/obj/source-built-upstream-cache'
diff --git a/eng/common/templates-official/variables/sdl-variables.yml b/eng/common/templates-official/variables/sdl-variables.yml
index dbdd66d4a4b..f1311bbb1b3 100644
--- a/eng/common/templates-official/variables/sdl-variables.yml
+++ b/eng/common/templates-official/variables/sdl-variables.yml
@@ -4,4 +4,4 @@ variables:
 - name: DefaultGuardianVersion
   value: 0.109.0
 - name: GuardianPackagesConfigFile
-  value: $(Build.SourcesDirectory)\eng\common\sdl\packages.config
\ No newline at end of file
+  value: $(System.DefaultWorkingDirectory)\eng\common\sdl\packages.config
\ No newline at end of file
diff --git a/eng/common/templates/job/job.yml b/eng/common/templates/job/job.yml
index 2856f7de106..80454d5a558 100644
--- a/eng/common/templates/job/job.yml
+++ b/eng/common/templates/job/job.yml
@@ -37,7 +37,7 @@ parameters:
 # Sbom related params
   enableSbom: true
   PackageVersion: 7.0.0
-  BuildDropPath: '$(Build.SourcesDirectory)/artifacts'
+  BuildDropPath: '$(System.DefaultWorkingDirectory)/artifacts'
 
 jobs:
 - job: ${{ parameters.name }}
@@ -163,7 +163,7 @@ jobs:
       inputs:
         languages: ${{ coalesce(parameters.richCodeNavigationLanguage, 'csharp') }}
         environment: ${{ coalesce(parameters.richCodeNavigationEnvironment, 'production') }}
-        richNavLogOutputDirectory: $(Build.SourcesDirectory)/artifacts/bin
+        richNavLogOutputDirectory: $(System.DefaultWorkingDirectory)/artifacts/bin
         uploadRichNavArtifacts: ${{ coalesce(parameters.richCodeNavigationUploadArtifacts, false) }}
       continueOnError: true
 
@@ -220,7 +220,7 @@ jobs:
     - task: PublishBuildArtifacts@1
       displayName: Publish Logs
       inputs:
-        PathtoPublish: '$(Build.SourcesDirectory)/artifacts/log/$(_BuildConfig)'
+        PathtoPublish: '$(System.DefaultWorkingDirectory)/artifacts/log/$(_BuildConfig)'
         PublishLocation: Container
         ArtifactName: ${{ coalesce(parameters.enablePublishBuildArtifacts.artifactName, '$(Agent.Os)_$(Agent.JobName)' ) }}
       continueOnError: true
@@ -232,7 +232,7 @@ jobs:
       inputs:
         testResultsFormat: 'xUnit'
         testResultsFiles: '*.xml'
-        searchFolder: '$(Build.SourcesDirectory)/artifacts/TestResults/$(_BuildConfig)'
+        searchFolder: '$(System.DefaultWorkingDirectory)/artifacts/TestResults/$(_BuildConfig)'
         testRunTitle: ${{ coalesce(parameters.testRunTitle, parameters.name, '$(System.JobName)') }}-xunit
         mergeTestResults: ${{ parameters.mergeTestResults }}
       continueOnError: true
@@ -243,7 +243,7 @@ jobs:
       inputs:
         testResultsFormat: 'VSTest'
         testResultsFiles: '*.trx'
-        searchFolder: '$(Build.SourcesDirectory)/artifacts/TestResults/$(_BuildConfig)'
+        searchFolder: '$(System.DefaultWorkingDirectory)/artifacts/TestResults/$(_BuildConfig)'
         testRunTitle: ${{ coalesce(parameters.testRunTitle, parameters.name, '$(System.JobName)') }}-trx
         mergeTestResults: ${{ parameters.mergeTestResults }}
       continueOnError: true
@@ -257,7 +257,7 @@ jobs:
         IgnoreDirectories: ${{ parameters.componentGovernanceIgnoreDirectories }}
 
   - ${{ if eq(parameters.enableBuildRetry, 'true') }}:
-    - publish: $(Build.SourcesDirectory)\eng\common\BuildConfiguration
+    - publish: $(System.DefaultWorkingDirectory)\eng\common\BuildConfiguration
       artifact: BuildConfiguration
       displayName: Publish build retry configuration
       continueOnError: true
diff --git a/eng/common/templates/job/onelocbuild.yml b/eng/common/templates/job/onelocbuild.yml
index 60ab00c4de3..2cd3840c992 100644
--- a/eng/common/templates/job/onelocbuild.yml
+++ b/eng/common/templates/job/onelocbuild.yml
@@ -8,7 +8,7 @@ parameters:
   CeapexPat: $(dn-bot-ceapex-package-r) # PAT for the loc AzDO instance https://dev.azure.com/ceapex
   GithubPat: $(BotAccount-dotnet-bot-repo-PAT)
 
-  SourcesDirectory: $(Build.SourcesDirectory)
+  SourcesDirectory: $(System.DefaultWorkingDirectory)
   CreatePr: true
   AutoCompletePr: false
   ReusePr: true
@@ -60,7 +60,7 @@ jobs:
     - ${{ if ne(parameters.SkipLocProjectJsonGeneration, 'true') }}:
       - task: Powershell@2
         inputs:
-          filePath: $(Build.SourcesDirectory)/eng/common/generate-locproject.ps1
+          filePath: $(System.DefaultWorkingDirectory)/eng/common/generate-locproject.ps1
           arguments: $(_GenerateLocProjectArguments)
         displayName: Generate LocProject.json
         condition: ${{ parameters.condition }}
@@ -103,7 +103,7 @@ jobs:
     - task: PublishBuildArtifacts@1
       displayName: Publish LocProject.json
       inputs:
-        PathtoPublish: '$(Build.SourcesDirectory)/eng/Localize/'
+        PathtoPublish: '$(System.DefaultWorkingDirectory)/eng/Localize/'
         PublishLocation: Container
         ArtifactName: Loc
       condition: ${{ parameters.condition }}
\ No newline at end of file
diff --git a/eng/common/templates/job/publish-build-assets.yml b/eng/common/templates/job/publish-build-assets.yml
index cc2b346ba8b..2956d8117f7 100644
--- a/eng/common/templates/job/publish-build-assets.yml
+++ b/eng/common/templates/job/publish-build-assets.yml
@@ -30,6 +30,8 @@ parameters:
 
   signingValidationAdditionalParameters: ''
 
+  repositoryAlias: self
+
 jobs:
 - job: Asset_Registry_Publish
 
@@ -63,6 +65,9 @@ jobs:
 
   steps:
   - ${{ if and(eq(parameters.runAsPublic, 'false'), ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}:
+    - checkout: ${{ parameters.repositoryAlias }}
+      fetchDepth: 3
+      clean: true
     - task: DownloadBuildArtifacts@0
       displayName: Download artifact
       inputs:
@@ -80,7 +85,7 @@ jobs:
         azureSubscription: "Darc: Maestro Production"
         scriptType: ps
         scriptLocation: scriptPath
-        scriptPath: $(Build.SourcesDirectory)/eng/common/sdk-task.ps1
+        scriptPath: $(System.DefaultWorkingDirectory)/eng/common/sdk-task.ps1
         arguments: >
           -task PublishBuildAssets -restore -msbuildEngine dotnet
           /p:ManifestsPath='$(Build.StagingDirectory)/Download/AssetManifests'
@@ -111,7 +116,7 @@ jobs:
       inputs:
         targetType: inline
         script: |
-          $symbolExclusionfile = "$(Build.SourcesDirectory)/eng/SymbolPublishingExclusionsFile.txt"
+          $symbolExclusionfile = "$(System.DefaultWorkingDirectory)/eng/SymbolPublishingExclusionsFile.txt"
           if(Test-Path -Path $symbolExclusionfile)
           {
             Write-Host "SymbolExclusionFile exists"
@@ -126,7 +131,7 @@ jobs:
       displayName: Publish SymbolPublishingExclusionsFile Artifact
       condition: eq(variables['SymbolExclusionFile'], 'true')
       inputs:
-        PathtoPublish: '$(Build.SourcesDirectory)/eng/SymbolPublishingExclusionsFile.txt'
+        PathtoPublish: '$(System.DefaultWorkingDirectory)/eng/SymbolPublishingExclusionsFile.txt'
         PublishLocation: Container
         ArtifactName: ReleaseConfigs
 
@@ -142,7 +147,7 @@ jobs:
           azureSubscription: "Darc: Maestro Production"
           scriptType: ps
           scriptLocation: scriptPath
-          scriptPath: $(Build.SourcesDirectory)/eng/common/post-build/publish-using-darc.ps1
+          scriptPath: $(System.DefaultWorkingDirectory)/eng/common/post-build/publish-using-darc.ps1
           arguments: -BuildId $(BARBuildId) 
             -PublishingInfraVersion 3
             -AzdoToken '$(System.AccessToken)'
diff --git a/eng/common/templates/job/source-index-stage1.yml b/eng/common/templates/job/source-index-stage1.yml
index 8538f44bab2..81606fd9a54 100644
--- a/eng/common/templates/job/source-index-stage1.yml
+++ b/eng/common/templates/job/source-index-stage1.yml
@@ -58,7 +58,7 @@ jobs:
   - script: ${{ parameters.sourceIndexBuildCommand }}
     displayName: Build Repository
 
-  - script: $(Agent.TempDirectory)/.source-index/tools/BinLogToSln -i $(BinlogPath) -r $(Build.SourcesDirectory) -n $(Build.Repository.Name) -o .source-index/stage1output
+  - script: $(Agent.TempDirectory)/.source-index/tools/BinLogToSln -i $(BinlogPath) -r $(System.DefaultWorkingDirectory) -n $(Build.Repository.Name) -o .source-index/stage1output
     displayName: Process Binlog into indexable sln
 
   - ${{ if and(eq(parameters.runAsPublic, 'false'), ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}:
diff --git a/eng/common/templates/jobs/codeql-build.yml b/eng/common/templates/jobs/codeql-build.yml
index f7dc5ea4aaa..e8b43e3b4cb 100644
--- a/eng/common/templates/jobs/codeql-build.yml
+++ b/eng/common/templates/jobs/codeql-build.yml
@@ -23,7 +23,7 @@ jobs:
       - name: DefaultGuardianVersion
         value: 0.109.0
       - name: GuardianPackagesConfigFile
-        value: $(Build.SourcesDirectory)\eng\common\sdl\packages.config
+        value: $(System.DefaultWorkingDirectory)\eng\common\sdl\packages.config
       - name: GuardianVersion
         value: ${{ coalesce(parameters.overrideGuardianVersion, '$(DefaultGuardianVersion)') }}
   
diff --git a/eng/common/templates/jobs/jobs.yml b/eng/common/templates/jobs/jobs.yml
index 289bb2396ce..34387a8c7ac 100644
--- a/eng/common/templates/jobs/jobs.yml
+++ b/eng/common/templates/jobs/jobs.yml
@@ -40,6 +40,7 @@ parameters:
 
   enableSourceIndex: false
   sourceIndexParams: {}
+  repositoryAlias: self
 
 # Internal resources (telemetry, microbuild) can only be accessed from non-public projects,
 # and some (Microbuild) should only be applied to non-PR cases for internal builds.
@@ -95,3 +96,4 @@ jobs:
         enablePublishBuildArtifacts: ${{ parameters.enablePublishBuildArtifacts }}
         artifactsPublishingAdditionalParameters: ${{ parameters.artifactsPublishingAdditionalParameters }}
         signingValidationAdditionalParameters: ${{ parameters.signingValidationAdditionalParameters }}
+        repositoryAlias: ${{ parameters.repositoryAlias }}
diff --git a/eng/common/templates/post-build/post-build.yml b/eng/common/templates/post-build/post-build.yml
index c3b6a3012fe..6e5722dc2e1 100644
--- a/eng/common/templates/post-build/post-build.yml
+++ b/eng/common/templates/post-build/post-build.yml
@@ -130,7 +130,7 @@ stages:
         - task: PowerShell@2
           displayName: Validate
           inputs:
-            filePath: $(Build.SourcesDirectory)/eng/common/post-build/nuget-validation.ps1
+            filePath: $(System.DefaultWorkingDirectory)/eng/common/post-build/nuget-validation.ps1
             arguments: -PackagesPath $(Build.ArtifactStagingDirectory)/PackageArtifacts/
               -ToolDestinationPath $(Agent.BuildDirectory)/Extract/
 
@@ -180,7 +180,7 @@ stages:
             filePath: eng\common\sdk-task.ps1
             arguments: -task SigningValidation -restore -msbuildEngine vs
               /p:PackageBasePath='$(Build.ArtifactStagingDirectory)/PackageArtifacts'
-              /p:SignCheckExclusionsFile='$(Build.SourcesDirectory)/eng/SignCheckExclusionsFile.txt'
+              /p:SignCheckExclusionsFile='$(System.DefaultWorkingDirectory)/eng/SignCheckExclusionsFile.txt'
               ${{ parameters.signingValidationAdditionalParameters }}
 
         - template: ../steps/publish-logs.yml
@@ -220,7 +220,7 @@ stages:
         - task: PowerShell@2
           displayName: Validate
           inputs:
-            filePath: $(Build.SourcesDirectory)/eng/common/post-build/sourcelink-validation.ps1
+            filePath: $(System.DefaultWorkingDirectory)/eng/common/post-build/sourcelink-validation.ps1
             arguments: -InputPath $(Build.ArtifactStagingDirectory)/BlobArtifacts/
               -ExtractPath $(Agent.BuildDirectory)/Extract/
               -GHRepoName $(Build.Repository.Name)
@@ -274,7 +274,7 @@ stages:
             azureSubscription: "Darc: Maestro Production"
             scriptType: ps
             scriptLocation: scriptPath
-            scriptPath: $(Build.SourcesDirectory)/eng/common/post-build/publish-using-darc.ps1
+            scriptPath: $(System.DefaultWorkingDirectory)/eng/common/post-build/publish-using-darc.ps1
             arguments: -BuildId $(BARBuildId)
               -PublishingInfraVersion ${{ parameters.publishingInfraVersion }}
               -AzdoToken '$(System.AccessToken)'
diff --git a/eng/common/templates/post-build/setup-maestro-vars.yml b/eng/common/templates/post-build/setup-maestro-vars.yml
index 64b9abc6850..4347fa80b68 100644
--- a/eng/common/templates/post-build/setup-maestro-vars.yml
+++ b/eng/common/templates/post-build/setup-maestro-vars.yml
@@ -32,7 +32,7 @@ steps:
             $AzureDevOpsBuildId = $Env:Build_BuildId
           }
           else {
-            . $(Build.SourcesDirectory)\eng\common\tools.ps1
+            . $(System.DefaultWorkingDirectory)\eng\common\tools.ps1
             $darc = Get-Darc
             $buildInfo = & $darc get-build `
               --id ${{ parameters.BARBuildId }} `
diff --git a/eng/common/templates/post-build/trigger-subscription.yml b/eng/common/templates/post-build/trigger-subscription.yml
index da669030daf..52df7077482 100644
--- a/eng/common/templates/post-build/trigger-subscription.yml
+++ b/eng/common/templates/post-build/trigger-subscription.yml
@@ -5,7 +5,7 @@ steps:
 - task: PowerShell@2
   displayName: Triggering subscriptions
   inputs:
-    filePath: $(Build.SourcesDirectory)/eng/common/post-build/trigger-subscriptions.ps1
+    filePath: $(System.DefaultWorkingDirectory)/eng/common/post-build/trigger-subscriptions.ps1
     arguments: -SourceRepo $(Build.Repository.Uri)
       -ChannelId ${{ parameters.ChannelId }}
       -MaestroApiAccessToken $(MaestroAccessToken)
diff --git a/eng/common/templates/steps/add-build-to-channel.yml b/eng/common/templates/steps/add-build-to-channel.yml
index f67a210d62f..5b6fec257ea 100644
--- a/eng/common/templates/steps/add-build-to-channel.yml
+++ b/eng/common/templates/steps/add-build-to-channel.yml
@@ -5,7 +5,7 @@ steps:
 - task: PowerShell@2
   displayName: Add Build to Channel
   inputs:
-    filePath: $(Build.SourcesDirectory)/eng/common/post-build/add-build-to-channel.ps1
+    filePath: $(System.DefaultWorkingDirectory)/eng/common/post-build/add-build-to-channel.ps1
     arguments: -BuildId $(BARBuildId) 
       -ChannelId ${{ parameters.ChannelId }}
       -MaestroApiAccessToken $(MaestroApiAccessToken)
diff --git a/eng/common/templates/steps/execute-sdl.yml b/eng/common/templates/steps/execute-sdl.yml
index fe0ebf8c904..047e8281ebc 100644
--- a/eng/common/templates/steps/execute-sdl.yml
+++ b/eng/common/templates/steps/execute-sdl.yml
@@ -15,17 +15,17 @@ steps:
   
 - ${{ if ne(parameters.overrideGuardianVersion, '') }}:
   - pwsh: |
-      Set-Location -Path $(Build.SourcesDirectory)\eng\common\sdl
+      Set-Location -Path $(System.DefaultWorkingDirectory)\eng\common\sdl
       . .\sdl.ps1
-      $guardianCliLocation = Install-Gdn -Path $(Build.SourcesDirectory)\.artifacts -Version ${{ parameters.overrideGuardianVersion }}
+      $guardianCliLocation = Install-Gdn -Path $(System.DefaultWorkingDirectory)\.artifacts -Version ${{ parameters.overrideGuardianVersion }}
       Write-Host "##vso[task.setvariable variable=GuardianCliLocation]$guardianCliLocation"
     displayName: Install Guardian (Overridden)
 
 - ${{ if eq(parameters.overrideGuardianVersion, '') }}:
   - pwsh: |
-      Set-Location -Path $(Build.SourcesDirectory)\eng\common\sdl
+      Set-Location -Path $(System.DefaultWorkingDirectory)\eng\common\sdl
       . .\sdl.ps1
-      $guardianCliLocation = Install-Gdn -Path $(Build.SourcesDirectory)\.artifacts
+      $guardianCliLocation = Install-Gdn -Path $(System.DefaultWorkingDirectory)\.artifacts
       Write-Host "##vso[task.setvariable variable=GuardianCliLocation]$guardianCliLocation"
     displayName: Install Guardian
 
@@ -40,7 +40,7 @@ steps:
 - ${{ if eq(parameters.overrideParameters, '') }}:
   - powershell: ${{ parameters.executeAllSdlToolsScript }}
       -GuardianCliLocation $(GuardianCliLocation)
-      -NugetPackageDirectory $(Build.SourcesDirectory)\.packages
+      -NugetPackageDirectory $(System.DefaultWorkingDirectory)\.packages
       ${{ parameters.additionalParameters }}
     displayName: Execute SDL
     continueOnError: ${{ parameters.sdlContinueOnError }}
@@ -76,7 +76,7 @@ steps:
       flattenFolders: true
       sourceFolder:  $(Agent.BuildDirectory)/.gdn/rc/
       contents: '**/*.sarif'
-      targetFolder: $(Build.SourcesDirectory)/CodeAnalysisLogs
+      targetFolder: $(System.DefaultWorkingDirectory)/CodeAnalysisLogs
     condition: succeededOrFailed()
 
   # Use PublishBuildArtifacts because the SARIF extension only checks this case
@@ -84,6 +84,6 @@ steps:
   - task: PublishBuildArtifacts@1
     displayName: Publish SARIF files to CodeAnalysisLogs container
     inputs:
-      pathToPublish:  $(Build.SourcesDirectory)/CodeAnalysisLogs
+      pathToPublish:  $(System.DefaultWorkingDirectory)/CodeAnalysisLogs
       artifactName: CodeAnalysisLogs
     condition: succeededOrFailed()
\ No newline at end of file
diff --git a/eng/common/templates/steps/generate-sbom.yml b/eng/common/templates/steps/generate-sbom.yml
index 2b21eae4273..b1fe8b3944b 100644
--- a/eng/common/templates/steps/generate-sbom.yml
+++ b/eng/common/templates/steps/generate-sbom.yml
@@ -6,7 +6,7 @@
 
 parameters:
   PackageVersion: 8.0.0
-  BuildDropPath: '$(Build.SourcesDirectory)/artifacts'
+  BuildDropPath: '$(System.DefaultWorkingDirectory)/artifacts'
   PackageName: '.NET'
   ManifestDirPath: $(Build.ArtifactStagingDirectory)/sbom
   IgnoreDirectories: ''
diff --git a/eng/common/templates/steps/publish-logs.yml b/eng/common/templates/steps/publish-logs.yml
index 88f238f36bf..e2f8413d8e1 100644
--- a/eng/common/templates/steps/publish-logs.yml
+++ b/eng/common/templates/steps/publish-logs.yml
@@ -8,15 +8,15 @@ steps:
   inputs:
     targetType: inline
     script: |
-      New-Item -ItemType Directory $(Build.SourcesDirectory)/PostBuildLogs/${{parameters.StageLabel}}/${{parameters.JobLabel}}/
-      Move-Item -Path $(Build.SourcesDirectory)/artifacts/log/Debug/* $(Build.SourcesDirectory)/PostBuildLogs/${{parameters.StageLabel}}/${{parameters.JobLabel}}/
+      New-Item -ItemType Directory $(System.DefaultWorkingDirectory)/PostBuildLogs/${{parameters.StageLabel}}/${{parameters.JobLabel}}/
+      Move-Item -Path $(System.DefaultWorkingDirectory)/artifacts/log/Debug/* $(System.DefaultWorkingDirectory)/PostBuildLogs/${{parameters.StageLabel}}/${{parameters.JobLabel}}/
   continueOnError: true
   condition: always()
 
 - task: PublishBuildArtifacts@1
   displayName: Publish Logs
   inputs:
-    PathtoPublish: '$(Build.SourcesDirectory)/PostBuildLogs'
+    PathtoPublish: '$(System.DefaultWorkingDirectory)/PostBuildLogs'
     PublishLocation: Container
     ArtifactName: PostBuildLogs
   continueOnError: true
diff --git a/eng/common/templates/steps/source-build.yml b/eng/common/templates/steps/source-build.yml
index 41bbb915736..4fb5643e5de 100644
--- a/eng/common/templates/steps/source-build.yml
+++ b/eng/common/templates/steps/source-build.yml
@@ -26,8 +26,8 @@ steps:
     internalRestoreArgs=
     if [ '$(dn-bot-dnceng-artifact-feeds-rw)' != '$''(dn-bot-dnceng-artifact-feeds-rw)' ]; then
       # Temporarily work around https://github.com/dotnet/arcade/issues/7709
-      chmod +x $(Build.SourcesDirectory)/eng/common/SetupNugetSources.sh
-      $(Build.SourcesDirectory)/eng/common/SetupNugetSources.sh $(Build.SourcesDirectory)/NuGet.config $(dn-bot-dnceng-artifact-feeds-rw)
+      chmod +x $(System.DefaultWorkingDirectory)/eng/common/SetupNugetSources.sh
+      $(System.DefaultWorkingDirectory)/eng/common/SetupNugetSources.sh $(System.DefaultWorkingDirectory)/NuGet.config $(dn-bot-dnceng-artifact-feeds-rw)
       internalRestoreArgs='/p:CopyWipIntoInnerSourceBuildRepo=true'
 
       # The 'Copy WIP' feature of source build uses git stash to apply changes from the original repo.
@@ -101,7 +101,7 @@ steps:
 - task: CopyFiles@2
   displayName: Prepare BuildLogs staging directory
   inputs:
-    SourceFolder: '$(Build.SourcesDirectory)'
+    SourceFolder: '$(System.DefaultWorkingDirectory)'
     Contents: |
       **/*.log
       **/*.binlog
@@ -126,4 +126,4 @@ steps:
 - task: ComponentGovernanceComponentDetection@0
   displayName: Component Detection (Exclude upstream cache)
   inputs:
-    ignoreDirectories: '$(Build.SourcesDirectory)/artifacts/source-build/self/src/artifacts/obj/source-built-upstream-cache'
+    ignoreDirectories: '$(System.DefaultWorkingDirectory)/artifacts/source-build/self/src/artifacts/obj/source-built-upstream-cache'
diff --git a/eng/common/templates/variables/sdl-variables.yml b/eng/common/templates/variables/sdl-variables.yml
index dbdd66d4a4b..f1311bbb1b3 100644
--- a/eng/common/templates/variables/sdl-variables.yml
+++ b/eng/common/templates/variables/sdl-variables.yml
@@ -4,4 +4,4 @@ variables:
 - name: DefaultGuardianVersion
   value: 0.109.0
 - name: GuardianPackagesConfigFile
-  value: $(Build.SourcesDirectory)\eng\common\sdl\packages.config
\ No newline at end of file
+  value: $(System.DefaultWorkingDirectory)\eng\common\sdl\packages.config
\ No newline at end of file
diff --git a/eng/publishing/v3/publish.yml b/eng/publishing/v3/publish.yml
index 33b0ba623c5..56dd92c6b9b 100644
--- a/eng/publishing/v3/publish.yml
+++ b/eng/publishing/v3/publish.yml
@@ -144,7 +144,7 @@ stages:
         - task: PowerShell@2
           displayName: Enable cross-org publishing
           inputs:
-            filePath: $(Build.SourcesDirectory)/eng/common/enable-cross-org-publishing.ps1
+            filePath: $(System.DefaultWorkingDirectory)/eng/common/enable-cross-org-publishing.ps1
             arguments: -token $(dn-bot-all-orgs-artifact-feeds-rw)
 
         - task: AzureCLI@2
@@ -162,7 +162,7 @@ stages:
         - task: PowerShell@2
           displayName: Publish packages, blobs and symbols
           inputs:
-            filePath: $(Build.SourcesDirectory)/eng/common/sdk-task.ps1
+            filePath: $(System.DefaultWorkingDirectory)/eng/common/sdk-task.ps1
             arguments: -task PublishArtifactsInManifest -restore -msbuildEngine dotnet
               /p:PublishingInfraVersion=3
               /p:BARBuildId=${{ parameters.BARBuildId }}
diff --git a/eng/validate-sdk.yml b/eng/validate-sdk.yml
index d2824abbe4d..fbbd1b4454d 100644
--- a/eng/validate-sdk.yml
+++ b/eng/validate-sdk.yml
@@ -39,7 +39,7 @@ jobs:
         inlineScript: >
           .\eng\update-packagesource.ps1
           -gitHubPat $(BotAccount-dotnet-maestro-bot-PAT)
-          -packagesSource $(Build.SourcesDirectory)/build_stage_artifacts
+          -packagesSource $(System.DefaultWorkingDirectory)/build_stage_artifacts
       displayName: Update package source
     - script: eng\common\cibuild.cmd
         $(_BuildArgs)