diff --git a/eng/pipelines/coreclr/templates/build-test-job.yml b/eng/pipelines/coreclr/templates/build-test-job.yml
index bb30b83e8c18b4..15f8668b8e9aa2 100644
--- a/eng/pipelines/coreclr/templates/build-test-job.yml
+++ b/eng/pipelines/coreclr/templates/build-test-job.yml
@@ -5,6 +5,14 @@ parameters:
   osSubgroup: ''
   container: ''
   testGroup: ''
+
+  # When set to a non-empty value (Debug / Release), it determines libraries
+  # build configuration to use for the tests. Setting this property implies
+  # a dependency of this job on the appropriate libraries build and is used
+  # to construct the name of the Azure artifact representing libraries build
+  # to use for building the tests.
+  liveLibrariesBuildConfig: ''
+
   displayNameArgs: ''
   condition: true
   stagedBuild: false
@@ -31,6 +39,7 @@ jobs:
     container: ${{ parameters.container }}
     testGroup: ${{ parameters.testGroup }}
     stagedBuild: ${{ parameters.stagedBuild }}
+    liveLibrariesBuildConfig: ${{ parameters.liveLibrariesBuildConfig }}
     variables: ${{ parameters.variables }}
     pool: ${{ parameters.pool }}
 
@@ -55,7 +64,11 @@ jobs:
     # because it needs System.Private.Corelib; we should be able to remove this dependency
     # by switching over to using reference assembly.
     ${{ if ne(parameters.stagedBuild, true) }}:
-      dependsOn: ${{ format('coreclr_product_build_{0}{1}_{2}_{3}', parameters.osGroup, parameters.osSubgroup, parameters.archType, parameters.buildConfig) }}
+      dependsOn:
+      - ${{ format('coreclr_product_build_{0}{1}_{2}_{3}', parameters.osGroup, parameters.osSubgroup, parameters.archType, parameters.buildConfig) }}
+      - ${{ if ne(parameters.liveLibrariesBuildConfig, '') }}:
+        - ${{ format('libraries_build_{0}_{1}{2}_{3}_{4}', 'netcoreapp', parameters.osGroup, parameters.osSubgroup, parameters.archType, parameters.liveLibrariesBuildConfig) }}
+
 
     ${{ if eq(parameters.testGroup, 'innerloop') }}:
       timeoutInMinutes: 90
@@ -75,6 +88,17 @@ jobs:
         displayName: Install native dependencies
 
 
+    # Optionally download live-built libraries
+    - ${{ if ne(parameters.liveLibrariesBuildConfig, '') }}:
+      - template: /eng/pipelines/common/download-artifact-step.yml
+        parameters:
+          unpackFolder: $(librariesDownloadDir)
+          cleanUnpackFolder: false
+          artifactFileName: '$(librariesArtifactName)$(archiveExtension)'
+          artifactName: '$(librariesArtifactName)'
+          displayName: 'live-built libraries'
+
+
     # Download product binaries directory
     - template: /eng/pipelines/common/download-artifact-step.yml
       parameters:
@@ -85,7 +109,7 @@ jobs:
 
 
     # Build managed test components
-    - script: $(coreClrRepoRootDir)build-test$(scriptExt) skipnative skipgeneratelayout $(buildConfig) $(archType) $(crossArg) $(priorityArg) ci
+    - script: $(coreClrRepoRootDir)build-test$(scriptExt) skipnative skipgeneratelayout $(buildConfig) $(archType) $(crossArg) $(priorityArg) ci $(librariesOverrideArg)
       displayName: Build managed test components
 
 
diff --git a/eng/pipelines/coreclr/templates/run-test-job.yml b/eng/pipelines/coreclr/templates/run-test-job.yml
index f65e2fa9da75da..bf854e1af11d11 100644
--- a/eng/pipelines/coreclr/templates/run-test-job.yml
+++ b/eng/pipelines/coreclr/templates/run-test-job.yml
@@ -9,10 +9,12 @@ parameters:
   testGroup: ''
   crossrootfsDir: ''
   readyToRun: false
+  liveLibrariesBuildConfig: ''
   crossgen2: false
   helixQueues: ''
   # If true, run the corefx tests instead of the coreclr ones
   corefxTests: false
+  condition: true
   stagedBuild: false
   displayNameArgs: ''
   runInUnloadableContext: false
@@ -38,6 +40,7 @@ jobs:
     crossrootfsDir: ${{ parameters.crossrootfsDir }}
     corefxTests: ${{ parameters.corefxTests }}
     stagedBuild: ${{ parameters.stagedBuild }}
+    liveLibrariesBuildConfig: ${{ parameters.liveLibrariesBuildConfig }}
     helixType: 'build/tests/'
     pool: ${{ parameters.pool }}
 
@@ -105,6 +108,17 @@ jobs:
 
     steps:
 
+    # Optionally download live-built libraries
+    - ${{ if ne(parameters.liveLibrariesBuildConfig, '') }}:
+      - template: /eng/pipelines/common/download-artifact-step.yml
+        parameters:
+          unpackFolder: $(librariesDownloadDir)
+          cleanUnpackFolder: false
+          artifactFileName: '$(librariesArtifactName)$(archiveExtension)'
+          artifactName: '$(librariesArtifactName)'
+          displayName: 'live-built libraries'
+
+
     # Download and unzip managed test artifacts
     - ${{ if ne(parameters.corefxTests, true) }}:
       - template: /eng/pipelines/common/download-artifact-step.yml
@@ -151,19 +165,19 @@ jobs:
     # the native artifacts to the final test folders is dependent on availability of the
     # managed test artifacts.
     - ${{ if ne(parameters.corefxTests, true) }}:
-      - script: $(coreClrRepoRootDir)build-test$(scriptExt) copynativeonly $(buildConfig) $(archType) $(priorityArg)
+      - script: $(coreClrRepoRootDir)build-test$(scriptExt) copynativeonly $(buildConfig) $(archType) $(priorityArg) $(librariesOverrideArg)
         displayName: Copy native test components to test output folder
 
 
     # Generate test host
     - ${{ if eq(parameters.corefxTests, true) }}:
-      - script: $(coreClrRepoRootDir)build-test$(scriptExt) skipmanaged skipnative $(testhostArg) $(buildConfig) $(archType) $(crossArg) $(priorityArg)
+      - script: $(coreClrRepoRootDir)build-test$(scriptExt) skipmanaged skipnative $(testhostArg) $(buildConfig) $(archType) $(crossArg) $(priorityArg) $(librariesOverrideArg)
         displayName: Generate test host
 
 
     # Crossgen framework assemblies prior to triggering readyToRun execution runs.
     - ${{ if eq(parameters.readyToRun, true) }}:
-      - script: $(coreClrRepoRootDir)build-test$(scriptExt) skipmanaged skipnative $(crossgenArg) $(buildConfig) $(archType) $(crossArg) $(priorityArg)
+      - script: $(coreClrRepoRootDir)build-test$(scriptExt) skipmanaged skipnative $(crossgenArg) $(buildConfig) $(archType) $(crossArg) $(priorityArg) $(librariesOverrideArg)
         displayName: Crossgen framework assemblies
 
 
diff --git a/eng/pipelines/coreclr/templates/xplat-pipeline-job.yml b/eng/pipelines/coreclr/templates/xplat-pipeline-job.yml
index f642b79db0d645..b36cad5bf86bce 100644
--- a/eng/pipelines/coreclr/templates/xplat-pipeline-job.yml
+++ b/eng/pipelines/coreclr/templates/xplat-pipeline-job.yml
@@ -11,6 +11,7 @@ parameters:
   testGroup: ''
   crossrootfsDir: ''
   corefxTests: false
+  liveLibrariesBuildConfig: ''
   stagedBuild: false
   strategy: ''
   pool: ''
@@ -103,6 +104,18 @@ jobs:
         - name: priorityArg
           value: '-priority=1'
 
+    - librariesArtifactName: ''
+    - librariesOverrideArg: ''
+    - librariesDownloadDir: ''
+
+    - ${{ if ne(parameters.liveLibrariesBuildConfig, '') }}:
+      - librariesArtifactName: ${{ format('libraries_bin_{0}_{1}{2}_{3}_{4}', 'netcoreapp', parameters.osGroup, parameters.osSubgroup, parameters.archType, parameters.liveLibrariesBuildConfig) }}
+      - librariesDownloadDir: $(Build.SourcesDirectory)/artifacts
+      - ${{ if eq(parameters.osGroup, 'Windows_NT') }}:
+        - librariesOverrideArg: ' localcorefxpath $(Build.SourcesDirectory) localcorefxconfig ${{ parameters.liveLibrariesBuildConfig }}'
+      - ${{ if ne(parameters.osGroup, 'Windows_NT') }}:
+        - librariesOverrideArg: ' localcorefxpath=$(Build.SourcesDirectory) localcorefxconfig=${{ parameters.liveLibrariesBuildConfig }}'
+
     - ${{ each variable in parameters.variables }}:
       - ${{insert}}: ${{ variable }}
 
diff --git a/eng/pipelines/libraries/base-job.yml b/eng/pipelines/libraries/base-job.yml
index e345b8973f81ff..cceb842179cb12 100644
--- a/eng/pipelines/libraries/base-job.yml
+++ b/eng/pipelines/libraries/base-job.yml
@@ -5,7 +5,9 @@ parameters:
   osSubgroup: ''
   framework: ''
   isOfficialBuild: false
+  liveCoreClrBuildConfig: ''
   timeoutInMinutes: 150
+  condition: true
   container: ''
   steps: []
   dependsOn: []
@@ -14,29 +16,31 @@ parameters:
   displayName: ''
   testScope: ''
   pool: ''
-  stepName: ''
 
 jobs:
   - template: /eng/common/templates/job/job.yml
     parameters:
-      name: ${{ format('libraries_{0}_{1}_{2}{3}_{4}_{5}', parameters.stepName, parameters.framework, parameters.osGroup, parameters.osSubgroup, parameters.archType, parameters.buildConfig) }}
+      name: ${{ format('libraries_{0}_{1}_{2}{3}_{4}_{5}', parameters.name, parameters.framework, parameters.osGroup, parameters.osSubgroup, parameters.archType, parameters.buildConfig) }}
       ${{ if eq(parameters.framework, 'netcoreapp') }}:
-        displayName: ${{ format('{0} {1}{2} {3} {4}', parameters.stepName, parameters.osGroup, parameters.osSubgroup, parameters.archType, parameters.buildConfig) }}
+        displayName: ${{ format('Libraries {0} {1}{2} {3} {4}', parameters.displayName, parameters.osGroup, parameters.osSubgroup, parameters.archType, parameters.buildConfig) }}
       ${{ if ne(parameters.framework, 'netcoreapp') }}:
-        displayName: ${{ format('{0} {1} {2} {3} {4}', parameters.stepName, parameters.osGroup, parameters.framework, parameters.archType, parameters.buildConfig) }}
+        displayName: ${{ format('Libraries {0} {1} {2} {3} {4}', parameters.displayName, parameters.osGroup, parameters.framework, parameters.archType, parameters.buildConfig) }}
 
       enableTelemetry: ${{ parameters.isOfficialBuild }} # TODO: figure out if it's needed
       container: ${{ parameters.container }}
+      condition: ${{ parameters.condition }}
       helixRepo: dotnet/runtime
       pool: ${{ parameters.pool }}
       variables:
+        - _buildScriptFileName: libraries
         - _BuildConfig: ${{ parameters.buildConfig }}
+
         - _msbuildCommonParameters: ''
         - _stripSymbolsArg: ''
         - _runtimeOSArg: ''
         - _portableArg: ''
         - _finalFrameworkArg: -framework ${{ parameters.framework }}
-        - _buildScript: $(buildScriptFileName)$(scriptExt)
+        - _buildScript: $(_buildScriptFileName)$(scriptExt)
         - _warnAsErrorArg: ''
         - _testScopeArg: ''
 
@@ -65,19 +69,26 @@ jobs:
         - ${{ if eq(parameters.isOfficialBuild, 'true') }}:
           - _msbuildCommonParameters: /p:OfficialBuildId=$(Build.BuildNumber)
 
+        - _coreClrArtifactName: ''
+        - _coreClrDownloadPath: ''
+        - _coreClrOverridePathArg: ''
+
+        - ${{ if ne(parameters.liveCoreClrBuildConfig, '') }}:
+          - _coreClrDownloadPath: '$(Build.SourcesDirectory)/artifacts/transport/coreclr'
+          - _coreClrArtifactName: 'CoreCLRProduct_${{ parameters.osGroup }}${{ parameters.osSubgroup }}_${{ parameters.archType }}_${{ parameters.liveCoreClrBuildConfig }}'
+          - _coreClrOverridePathArg: ' /p:CoreCLROverridePath=$(_coreClrDownloadPath)'
+
         # Windows variables
         - ${{ if eq(parameters.osGroup, 'Windows_NT') }}:
-          - _msbuildCommand: powershell -ExecutionPolicy ByPass -NoProfile eng\common\msbuild.ps1 -warnaserror:0 -ci
           - _runtimeOSArg: /p:RuntimeOS=win10
 
         # Non-Windows variables
         - ${{ if ne(parameters.osGroup, 'Windows_NT') }}:
-          - _msbuildCommand: ./eng/common/msbuild.sh --warnaserror false --ci
-          - _buildScript: ./$(buildScriptFileName)$(scriptExt)
+          - _buildScript: ./$(_buildScriptFileName)$(scriptExt)
           - ${{ if eq(parameters.isOfficialBuild, 'true') }}:
             - _stripSymbolsArg: -stripSymbols
 
-        - _buildArguments: -configuration ${{ parameters.buildConfig }} -ci -arch ${{ parameters.archType }} $(_finalFrameworkArg) $(_stripSymbolsArg) $(_testScopeArg) $(_warnAsErrorArg) $(_runtimeOSArg) $(_portableArg) $(_msbuildCommonParameters)
+        - _buildArguments: -configuration ${{ parameters.buildConfig }} -ci -arch ${{ parameters.archType }} $(_finalFrameworkArg) $(_stripSymbolsArg) $(_testScopeArg) $(_warnAsErrorArg) $(_runtimeOSArg) $(_portableArg) $(_msbuildCommonParameters) $(_coreClrOverridePathArg)
         - ${{ parameters.variables }}
 
       dependsOn:
@@ -102,4 +113,12 @@ jobs:
           git remote set-url origin $(Build.Repository.Uri)
         displayName: Clone the repository from Checkout.bundle
 
+      - ${{ if ne(parameters.liveCoreClrBuildConfig, '') }}:
+        - template: /eng/pipelines/common/download-artifact-step.yml
+          parameters:
+            unpackFolder: $(_coreClrDownloadPath)
+            artifactFileName: '$(_coreClrArtifactName)$(archiveExtension)'
+            artifactName: '$(_coreClrArtifactName)'
+            displayName: 'CoreCLR build drop'
+
       - ${{ parameters.steps }}
diff --git a/eng/pipelines/libraries/build-job.yml b/eng/pipelines/libraries/build-job.yml
index 0ae7cc6093d34b..9e4bf1cc4d1e58 100644
--- a/eng/pipelines/libraries/build-job.yml
+++ b/eng/pipelines/libraries/build-job.yml
@@ -5,6 +5,14 @@ parameters:
   archType: ''
   framework: netcoreapp
   isOfficialBuild: false
+
+  # When set to a non-empty value (Debug / Release), it determines CoreCLR
+  # build configuration to use for building libraries and tests. Setting this
+  # property implies a dependency of this job on the appropriate CoreCLR build
+  # and is used to construct the name of the Azure artifact representing
+  # CoreCLR build to use for building the libraries and library tests.
+  liveCoreClrBuildConfig: ''
+
   timeoutInMinutes: 150
   preBuildSteps: []
   container: ''
@@ -22,12 +30,18 @@ jobs:
       archType:  ${{ parameters.archType }}
       framework:  ${{ parameters.framework }}
       isOfficialBuild: ${{ parameters.isOfficialBuild }}
+      liveCoreClrBuildConfig: ${{ parameters.liveCoreClrBuildConfig }}
       timeoutInMinutes: ${{ parameters.timeoutInMinutes }}
       preBuildSteps: ${{ parameters.preBuildSteps }}
       container: ${{ parameters.container }}
       pool: ${{ parameters.pool }}
       testScope: ${{ parameters.testScope }}
-      stepName: Build
+      name: build
+      displayName: 'Build'
+
+      ${{ if ne(parameters.liveCoreClrBuildConfig, '') }}:
+        dependsOn:
+        - ${{ format('coreclr_product_build_{0}{1}_{2}_{3}', parameters.osGroup, parameters.osSubgroup, parameters.archType, parameters.liveCoreClrBuildConfig) }}
 
       variables:
         - _skipTestRestoreArg: /p:SkipTestRestore=true
@@ -40,6 +54,8 @@ jobs:
           - ${{ if ne(parameters.framework, 'allConfigurations') }}:
             - _skipTestRestoreArg: /p:SkipTestRestore=false
 
+        - ${{ parameters.variables }}
+
       steps:
         - script: $(_buildScript) -restore $(_buildArguments) $(_skipTestRestoreArg)
           displayName: Restore
diff --git a/eng/pipelines/libraries/build-test-job.yml b/eng/pipelines/libraries/build-test-job.yml
index a847b40cf7e235..f7a91d45b97a06 100644
--- a/eng/pipelines/libraries/build-test-job.yml
+++ b/eng/pipelines/libraries/build-test-job.yml
@@ -5,12 +5,14 @@ parameters:
   archType: ''
   framework: netcoreapp
   isOfficialBuild: false
+  liveCoreClrBuildConfig: ''
   timeoutInMinutes: 150
   container: ''
   publishTestArtifacs: true
   pool: ''
   testScope: ''
   variables: {}
+  condition: true
   runTests: false
 
 jobs:
@@ -22,14 +24,17 @@ jobs:
       archType:  ${{ parameters.archType }}
       framework:  ${{ parameters.framework }}
       isOfficialBuild: ${{ parameters.isOfficialBuild }}
+      condition: ${{ parameters.condition }}
+      liveCoreClrBuildConfig: ${{ parameters.liveCoreClrBuildConfig }}
       timeoutInMinutes: ${{ parameters.timeoutInMinutes }}
       container: ${{ parameters.container }}
       pool: ${{ parameters.pool }}
       testScope: ${{ parameters.testScope }}
-      stepName: Test
+      name: test_build
+      displayName: 'Test Build'
 
       dependsOn:
-      - ${{ format('libraries_Build_{0}_{1}{2}_{3}_{4}', parameters.framework, parameters.osGroup, parameters.osSubgroup, parameters.archType, parameters.buildConfig) }}
+      - ${{ format('libraries_build_{0}_{1}{2}_{3}_{4}', parameters.framework, parameters.osGroup, parameters.osSubgroup, parameters.archType, parameters.buildConfig) }}
 
       variables:
         - _archiveTestsParameter: /p:ArchiveTests=true
@@ -44,6 +49,7 @@ jobs:
             artifactName: ${{ format('libraries_bin_{0}_{1}{2}_{3}_{4}', parameters.framework, parameters.osGroup, parameters.osSubgroup, parameters.archType, parameters.buildConfig) }}
             artifactFileName: ${{ format('libraries_bin_{0}_{1}{2}_{3}_{4}', parameters.framework, parameters.osGroup, parameters.osSubgroup, parameters.archType, parameters.buildConfig) }}$(archiveExtension)
             unpackFolder: $(Build.SourcesDirectory)/artifacts
+            cleanUnpackFolder: false
         
         - script: $(_buildScript) -restore $(_buildArguments) $(_skipTestRestoreArg)
           displayName: Restore
diff --git a/eng/pipelines/libraries/helix.yml b/eng/pipelines/libraries/helix.yml
index 4f5f2d28af3c45..945b51bfe72635 100644
--- a/eng/pipelines/libraries/helix.yml
+++ b/eng/pipelines/libraries/helix.yml
@@ -11,7 +11,7 @@ parameters:
 
 steps:
   - script: ${{ parameters.msbuildScript }}
-            $(sourcesRoot)/sendtohelix.proj
+            $(Build.SourcesDirectory)/src/libraries/sendtohelix.proj
             /t:test
             /p:ArchGroup=${{ parameters.archGroup }}
             /p:ConfigurationGroup=${{ parameters.configuration }}
diff --git a/eng/pipelines/libraries/run-test-job.yml b/eng/pipelines/libraries/run-test-job.yml
index d7b316af4e9555..b662732c9d906e 100644
--- a/eng/pipelines/libraries/run-test-job.yml
+++ b/eng/pipelines/libraries/run-test-job.yml
@@ -5,11 +5,13 @@ parameters:
   archType: ''
   framework: netcoreapp
   isOfficialBuild: false
+  liveCoreClrBuildConfig: ''
   timeoutInMinutes: 150
   pool: ''
   testScope: ''
   helixQueues: []
   dependsOnBuildConfiguration: Debug
+  condition: true
   variables: {}
 
 jobs:
@@ -21,14 +23,17 @@ jobs:
       archType:  ${{ parameters.archType }}
       framework:  ${{ parameters.framework }}
       isOfficialBuild: ${{ parameters.isOfficialBuild }}
+      liveCoreClrBuildConfig: ${{ parameters.liveCoreClrBuildConfig }}
       timeoutInMinutes: ${{ parameters.timeoutInMinutes }}
       container: '' # we just send to helix, no need to use a container.
+      condition: ${{ parameters.condition }}
       pool: ${{ parameters.pool }}
-      stepName: Run
+      name: test_run
+      displayName: 'Test Run'
 
       dependsOn:
-      - ${{ format('libraries_Build_{0}_{1}{2}_{3}_{4}', parameters.framework, parameters.osGroup, parameters.osSubgroup, parameters.archType, parameters.buildConfig) }}
-      - ${{ format('libraries_Test_{0}_{1}_x64_{2}', parameters.framework, parameters.osGroup, parameters.dependsOnBuildConfiguration) }}
+      - ${{ format('libraries_build_{0}_{1}{2}_{3}_{4}', parameters.framework, parameters.osGroup, parameters.osSubgroup, parameters.archType, parameters.buildConfig) }}
+      - ${{ format('libraries_test_build_{0}_{1}_x64_{2}', parameters.framework, parameters.osGroup, parameters.dependsOnBuildConfiguration) }}
 
       variables:
         - _archiveTestsParameter: /p:ArchiveTests=true
@@ -61,4 +66,4 @@ jobs:
             framework: ${{ parameters.framework }}
             testScope: ${{ parameters.testScope }}
             creator: dotnet-bot
-            helixToken: ''
\ No newline at end of file
+            helixToken: ''
diff --git a/eng/pipelines/runtime.yml b/eng/pipelines/runtime.yml
new file mode 100644
index 00000000000000..f1cdbe016181d3
--- /dev/null
+++ b/eng/pipelines/runtime.yml
@@ -0,0 +1,137 @@
+trigger: none
+
+pr:
+  branches:
+    include:
+    - master
+    - release/*.*
+
+jobs:
+#
+# Checkout repository
+#
+- template: /eng/pipelines/common/checkout-job.yml
+
+#
+# Build CoreCLR
+#
+- template: /eng/pipelines/common/platform-matrix.yml
+  parameters:
+    jobTemplate: /eng/pipelines/coreclr/templates/build-job.yml
+    buildConfig: checked
+    platforms:
+    - OSX_x64
+    - Linux_x64
+    - Linux_arm
+    - Windows_NT_x86
+    - Windows_NT_x64
+    - Windows_NT_arm
+    - Windows_NT_arm64
+    jobParameters:
+      testGroup: innerloop
+
+#
+# Build libraries using live CoreLib from CoreCLR
+#
+- template: /eng/pipelines/common/platform-matrix.yml
+  parameters:
+    jobTemplate: /eng/pipelines/libraries/build-job.yml
+    buildConfig: Release
+    platforms:
+    - OSX_x64
+    - Linux_x64
+    - Linux_arm
+    - Windows_NT_x86
+    - Windows_NT_x64
+    - Windows_NT_arm
+    - Windows_NT_arm64
+    jobParameters:
+      isOfficialBuild: false
+      liveCoreClrBuildConfig: checked
+
+#
+# Test builds using live libraries build
+#
+- template: /eng/pipelines/common/platform-matrix.yml
+  parameters:
+    jobTemplate: /eng/pipelines/coreclr/templates/build-test-job.yml
+    buildConfig: checked
+    platforms:
+    - OSX_x64
+    - Linux_x64
+    - Linux_arm
+    - Windows_NT_x86
+    - Windows_NT_x64
+    - Windows_NT_arm
+    - Windows_NT_arm64
+    jobParameters:
+      testGroup: innerloop
+      liveLibrariesBuildConfig: Release
+
+#
+# CoreCLR Test executions
+#
+- template: /eng/pipelines/common/platform-matrix.yml
+  parameters:
+    jobTemplate: /eng/pipelines/coreclr/templates/run-test-job.yml
+    buildConfig: checked
+    platforms:
+    - OSX_x64
+    - Linux_x64
+    - Linux_arm
+    - Windows_NT_x86
+    - Windows_NT_x64
+    - Windows_NT_arm
+    - Windows_NT_arm64
+    helixQueueGroup: pr
+    helixQueuesTemplate: /eng/pipelines/coreclr/templates/helix-queues-setup.yml
+    jobParameters:
+      testGroup: innerloop
+      liveLibrariesBuildConfig: Release
+      condition: false
+
+#
+# Libraries Test Build
+#
+- template: /eng/pipelines/common/platform-matrix.yml
+  parameters:
+    jobTemplate: /eng/pipelines/libraries/build-test-job.yml
+    buildConfig: Release
+    platforms:
+    - OSX_x64
+    - Linux_x64
+    - Linux_arm
+    - Windows_NT_x86
+    - Windows_NT_x64
+    - Windows_NT_arm
+    - Windows_NT_arm64
+    jobParameters:
+      isOfficialBuild: false
+      testScope: innerloop
+      liveCoreClrBuildConfig: checked
+
+#
+# Libraries Test Execution
+#
+- template: /eng/pipelines/common/platform-matrix.yml
+  parameters:
+    jobTemplate: /eng/pipelines/libraries/run-test-job.yml
+    buildConfig: Release
+    platforms:
+    - OSX_x64
+    - Linux_x64
+    - Linux_arm
+    - Windows_NT_x86
+    - Windows_NT_x64
+    - Windows_NT_arm
+    - Windows_NT_arm64
+    helixQueueGroup: pr
+    helixQueuesTemplate: /eng/pipelines/libraries/helix-queues-setup.yml
+    jobParameters:
+      isOfficialBuild: false
+      isFullMatrix: false
+      framework: netcoreapp
+      testScope: innerloop
+      liveCoreClrBuildConfig: checked
+      dependsOnBuildConfiguration: Release
+      condition: false
diff --git a/src/coreclr/build-test.cmd b/src/coreclr/build-test.cmd
index f126181d88b681..936fbfb3fc0901 100644
--- a/src/coreclr/build-test.cmd
+++ b/src/coreclr/build-test.cmd
@@ -60,6 +60,7 @@ set __CopyNativeTestBinaries=0
 set __CopyNativeProjectsAfterCombinedTestBuild=true
 set __SkipGenerateLayout=0
 set __LocalCoreFXPath=
+set __LocalCoreFXConfig=%__BuildType%
 set __SkipFXRestoreArg=
 set __GenerateLayoutOnly=0
 
@@ -106,6 +107,7 @@ if /i "%1" == "-priority"             (set __Priority=%2&shift&set processedArgs
 if /i "%1" == "copynativeonly"        (set __CopyNativeTestBinaries=1&set __SkipNative=1&set __CopyNativeProjectsAfterCombinedTestBuild=false&set processedArgs=!processedArgs! %1&shift&goto Arg_Loop)
 if /i "%1" == "skipgeneratelayout"    (set __SkipGenerateLayout=1&set processedArgs=!processedArgs! %1&shift&goto Arg_Loop)
 if /i "%1" == "localcorefxpath"       (set __LocalCoreFXPath=%2&set __SkipFXRestoreArg=/p:__SkipFXRestore=true&set processedArgs=!processedArgs! %1 %2&shift&shift&goto Arg_Loop)
+if /i "%1" == "localcorefxconfig"     (set __LocalCoreFXConfig=%2&set processedArgs=!processedArgs! %1 %2&shift&shift&goto Arg_Loop)
 if /i "%1" == "generatelayoutonly"    (set __SkipManaged=1&set __SkipNative=1&set __CopyNativeProjectsAfterCombinedTestBuild=false&set processedArgs=!processedArgs! %1&shift&goto Arg_Loop)
 if /i "%1" == "--"                    (set processedArgs=!processedArgs! %1&shift&goto Arg_Loop)
 
@@ -481,6 +483,8 @@ REM === The test host includes a dotnet executable, system libraries and CoreCLR
 REM ===
 REM =========================================================================================
 
+if not "%__LocalCoreFXPath%" == "" goto SkipBuildingCoreFXTestHost
+
 echo %__MsgPrefix%Building CoreFX test host
 
 set __BuildLogRootName=Tests_CoreFX_Testhost
@@ -505,6 +509,8 @@ if errorlevel 1 (
     exit /b 1
 )
 
+:SkipBuildingCoreFXTestHost
+
 REM =========================================================================================
 REM ===
 REM === Create test wrappers.
@@ -576,9 +582,9 @@ REM ===
 REM =========================================================================================
 
 if NOT "%__LocalCoreFXPath%"=="" (
-    echo Patch CoreFX from %__LocalCoreFXPath%
+    echo Patch CoreFX from %__LocalCoreFXPath% (%__LocalCoreFXConfig%)
     set NEXTCMD=python "%__ProjectDir%\tests\scripts\patch-corefx.py" -clr_core_root "%CORE_ROOT%"^
-    -fx_root "%__LocalCoreFXPath%" -arch %__BuildArch% -build_type %__BuildType%
+    -fx_root "%__LocalCoreFXPath%" -arch %__BuildArch% -build_type %__LocalCoreFXConfig%
     echo !NEXTCMD!
     !NEXTCMD!
 )
diff --git a/src/coreclr/build-test.sh b/src/coreclr/build-test.sh
index 3f0fc0634b5150..bd5a62064de8c0 100755
--- a/src/coreclr/build-test.sh
+++ b/src/coreclr/build-test.sh
@@ -134,9 +134,9 @@ generate_layout()
 
 patch_corefx_libraries()
 {
-    echo "${__MsgPrefix}Patching CORE_ROOT: '${CORE_ROOT}' with CoreFX libaries from enlistment '${__LocalCoreFXPath}"
+    echo "${__MsgPrefix}Patching CORE_ROOT: '${CORE_ROOT}' with CoreFX libaries from enlistment '${__LocalCoreFXPath} (${__LocalCoreFXConfig})"
 
-    patchCoreFXArguments=("-clr_core_root" "${CORE_ROOT}" "-fx_root" "${__LocalCoreFXPath}" "-arch" "${__BuildArch}" "-build_type" "${__BuildType}")
+    patchCoreFXArguments=("-clr_core_root" "${CORE_ROOT}" "-fx_root" "${__LocalCoreFXPath}" "-arch" "${__BuildArch}" "-build_type" "${__LocalCoreFXConfig}")
     scriptPath="$__ProjectDir/tests/scripts"
     echo "python ${scriptPath}/patch-corefx.py ${patchCoreFXArguments[@]}"
     $__Python "${scriptPath}/patch-corefx.py" "${patchCoreFXArguments[@]}"
@@ -371,10 +371,10 @@ build_Tests()
 
     if [ $__SkipGenerateLayout != 1 ]; then
         generate_layout
-    fi
 
-    if [ ! -z "$__LocalCoreFXPath" ]; then
-        patch_corefx_libraries
+        if [ ! -z "$__LocalCoreFXPath" ]; then
+            patch_corefx_libraries
+        fi
     fi
 }
 
@@ -630,14 +630,12 @@ handle_arguments() {
             __SkipGenerateLayout=1
             ;;
 
-        localcorefxpath)
-            if [ -n "$2" ]; then
-                __LocalCoreFXPath="$2"
-                shift
-            else
-                echo "ERROR: 'localcorefxpath' requires a non-empty option argument"
-                exit 1
-            fi
+        localcorefxpath=*|-localcorefxpath=*)
+            __LocalCoreFXPath=$(echo "$1" | cut -d'=' -f 2)
+            ;;
+
+        localcorefxconfig=*|-localcorefxconfig=*)
+            __LocalCoreFXConfig=$(echo "$1" | cut -d'=' -f 2)
             ;;
 
         *)
@@ -686,6 +684,8 @@ __SkipRestore=""
 __SkipRestorePackages=0
 __SourceDir="$__ProjectDir/src"
 __UnprocessedBuildArgs=
+__LocalCoreFXPath=
+__LocalCoreFXConfig=${__BuildType}
 __UseNinja=0
 __VerboseBuild=0
 __cmakeargs=""
diff --git a/src/coreclr/tests/scripts/patch-corefx.py b/src/coreclr/tests/scripts/patch-corefx.py
old mode 100644
new mode 100755
index bbc44c1af07737..54dd929892e4c1
--- a/src/coreclr/tests/scripts/patch-corefx.py
+++ b/src/coreclr/tests/scripts/patch-corefx.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
 #
 # Licensed to the .NET Foundation under one or more agreements.
 # The .NET Foundation licenses this file to you under the MIT license.
@@ -239,7 +239,7 @@ def main(args):
     clr_os = 'Windows_NT' if Is_windows else Unix_name_map[os.uname()[0]]
 
     if not os.path.exists(clr_core_root):
-        raise Exception('Core root path %s does not exist.' % (core_root))
+        raise Exception('Core root path %s does not exist.' % (clr_core_root))
 
     fx_bin = os.path.join(fx_root,
                           'artifacts',
@@ -248,7 +248,7 @@ def main(args):
                           'netcoreapp-%s-%s-%s' % (clr_os, build_type, arch))
 
     if not os.path.exists(fx_bin):
-        raise Exception('CoreFX bin path %s does not exist.' % (core_root))
+        raise Exception('CoreFX bin path %s does not exist.' % (fx_bin))
 
     patch_coreclr_root(clr_core_root, fx_bin)