diff --git a/.yamato/build_classlibs_win.yml b/.yamato/build_classlibs_win.yml
new file mode 100644
index 0000000000000..d81ebeabe078b
--- /dev/null
+++ b/.yamato/build_classlibs_win.yml
@@ -0,0 +1,20 @@
+name: Build Classlibs Windows
+
+agent:
+  type: Unity::VM
+  image: platform-foundation/windows-vs2019-il2cpp-bokken:stable
+  flavor: b1.xlarge
+
+commands:
+  - perl .yamato/scripts/build_classlibs.pl
+
+triggers:
+  pull_requests:
+    - targets:
+        only:
+          - "unity-main"
+
+artifacts: 
+  win64:
+    paths:
+      - incomingbuilds\**
\ No newline at end of file
diff --git a/.yamato/build_windows_x64.yml b/.yamato/build_windows_x64.yml
index 2f230462b0591..e7679a0efab9d 100644
--- a/.yamato/build_windows_x64.yml
+++ b/.yamato/build_windows_x64.yml
@@ -8,6 +8,12 @@ agent:
 commands:
   - .yamato/scripts/build_win.bat
 
+triggers:
+  pull_requests:
+    - targets:
+        only:
+          - "unity-main"
+
 artifacts: 
   win64:
     paths:
diff --git a/.yamato/scripts/build_classlibs.pl b/.yamato/scripts/build_classlibs.pl
new file mode 100644
index 0000000000000..76fad4ce4b1b2
--- /dev/null
+++ b/.yamato/scripts/build_classlibs.pl
@@ -0,0 +1,25 @@
+use strict;
+use warnings;
+use File::Copy::Recursive qw(dircopy);
+use Cwd qw();
+
+my $path = Cwd::cwd();
+print("cwsd: $path\n");
+
+unless (-e "incomingbuilds" or mkdir("incomingbuilds"))
+{
+    die "Unable to create directory incomingbuilds";
+}
+
+my @hostPlatforms = ("windows", "OSX", "Linux");
+
+foreach my $hostPlatform(@hostPlatforms)
+{
+    system ("build.cmd", "libs", "-os $hostPlatform", "-c release") eq 0 or die ("Failed to make $hostPlatform host platform class libraries\n");
+
+    dircopy ("artifacts/bin/runtime/net7.0-$hostPlatform-Release-x64", "incomingbuilds/coreclrjit-$hostPlatform") or die $!;
+
+    system ("taskkill", "/IM", "\"dotnet.exe\"", "/F");
+
+    system ("build.cmd", "-clean");
+}
\ No newline at end of file
diff --git a/.yamato/scripts/build_win.bat b/.yamato/scripts/build_win.bat
index 7cb15792509d5..79ebdc83e32d3 100644
--- a/.yamato/scripts/build_win.bat
+++ b/.yamato/scripts/build_win.bat
@@ -1,5 +1,8 @@
 @echo off
-build.cmd -subset clr -a x64 -c release
+setlocal
+
+
+powershell -ExecutionPolicy ByPass -NoProfile -Command "& 'eng\build.ps1'" -subset clr -a x64 -c release
 
 if NOT %errorlevel% == 0 (
  echo "build failed"