diff --git a/.github/actions/build/action.yml b/.github/actions/build/action.yml
new file mode 100644
index 000000000..1ba5988f0
--- /dev/null
+++ b/.github/actions/build/action.yml
@@ -0,0 +1,14 @@
+name: Build
+description: Set up the repository, install the dependencies required to build the extension, and build the extension.
+
+runs:
+  using: "composite"
+  steps:
+    - name: Prepare LF build environment
+      uses: ./lingua-franca/.github/actions/prepare-build-env
+    - name: Install VS Code
+      uses: ./.github/actions/install-code
+    - name: Build the VS Code extension
+      # TODO: Cache the JARs and node_modules, hashing by LF ref and package.json.
+      run: npm install
+      shell: bash
diff --git a/.github/actions/install-code/action.yml b/.github/actions/install-code/action.yml
index aa435c374..b8aea03b4 100644
--- a/.github/actions/install-code/action.yml
+++ b/.github/actions/install-code/action.yml
@@ -1,15 +1,57 @@
 name: Install VS Code
-description: Set up VS Code (Linux-only)
+description: Set up VS Code
 author: Marten Lohstroh <marten@berkeley.edu>
 
 runs:
   using: composite
   steps:
-    - name: Install VS Code
+    - name: Install VS Code (Linux)
+      if: ${{ runner.os == 'Linux' }}
       run: |
+        sudo apt-get install wget gpg
+        wget -qO- https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor > packages.microsoft.gpg
+        sudo install -o root -g root -m 644 packages.microsoft.gpg /etc/apt/trusted.gpg.d/
+        sudo sh -c 'echo "deb [arch=amd64,arm64,armhf signed-by=/etc/apt/trusted.gpg.d/packages.microsoft.gpg] https://packages.microsoft.com/repos/code stable main" > /etc/apt/sources.list.d/vscode.list'
+        rm -f packages.microsoft.gpg
+        sudo apt install apt-transport-https
         sudo apt update
-        sudo apt install software-properties-common apt-transport-https wget
-        wget -q https://packages.microsoft.com/keys/microsoft.asc -O- | sudo apt-key add -
-        sudo add-apt-repository "deb [arch=amd64] https://packages.microsoft.com/repos/vscode stable main"
         sudo apt install code
-      shell: bash
\ No newline at end of file
+      shell: bash
+    - name: Install VS Code (MacOS)
+      if: ${{ runner.os == 'macOS' }}
+      run: brew install --cask visual-studio-code
+      shell: bash
+    - name: Install VS Code (Windows)
+      if: ${{ runner.os == 'Windows' }}
+      run: |
+        choco install vscode
+        refreshenv
+        echo "Appending to PATH..."
+        Add-Content "GITHUB_PATH" "C:\Program Files\Microsoft VS Code\"
+        Add-Content "Path" "C:\Program Files\Microsoft VS Code\"
+        [Environment]::SetEnvironmentVariable(
+          "Path",
+          [Environment]::GetEnvironmentVariable("Path", [EnvironmentVariableTarget]::Machine) + ";C:\Program Files\Microsoft VS Code\",
+          [EnvironmentVariableTarget]::Machine)
+        [Environment]::SetEnvironmentVariable(
+          "GITHUB_PATH",
+          [Environment]::GetEnvironmentVariable("Path", [EnvironmentVariableTarget]::Machine) + ";C:\Program Files\Microsoft VS Code\",
+          [EnvironmentVariableTarget]::Machine)
+        Add-Content "GITHUB_PATH" "C:\ProgramData\chocolatey\lib\vscode"
+        Add-Content "Path" "C:\ProgramData\chocolatey\lib"
+        [Environment]::SetEnvironmentVariable(
+          "Path",
+          [Environment]::GetEnvironmentVariable("Path", [EnvironmentVariableTarget]::Machine) + ";C:\ProgramData\chocolatey\lib\vscode",
+          [EnvironmentVariableTarget]::Machine)
+        echo "PATH is now:"
+        echo $env:GITHUB_PATH
+        code
+        vscode
+        visualstudiocode
+        C:\ProgramData\chocolatey\lib\vscode
+        "C:\Program Files\Microsoft VS Code\code.exe"
+        gcm code
+        where code
+        dir "C:\Program Files\Microsoft VS Code\"
+        dir "C:\ProgramData\chocolatey\lib\vscode"
+      shell: PowerShell
diff --git a/.github/actions/uninstall-dependencies/action.yml b/.github/actions/uninstall-dependencies/action.yml
new file mode 100644
index 000000000..925b4a423
--- /dev/null
+++ b/.github/actions/uninstall-dependencies/action.yml
@@ -0,0 +1,28 @@
+name: Uninstall dependencies
+description: Uninstall dependencies whose presence the VS Code extension may check for.
+
+runs:
+  steps:
+    - name: Uninstall packages
+      uses: ./lingua-franca/.github/actions/uninstall-dependencies
+      with:
+        platform: ${{ matrix.platform }}
+    - name: Uninstall packages Ubuntu
+        run: |
+          sudo apt-get remove gcc
+          sudo apt-get remove g++
+          rm -rf ${JAVA_HOME}
+        if: ${{ platform == 'Linux' }}
+    - name: Uninstall packages MacOS
+      run: |
+        brew uninstall --ignore-dependencies g++
+        brew uninstall --ignore-dependencies clang-*
+        rm -rf ${JAVA_HOME}
+      if: ${{ runner.os == 'macOS' }}
+    - name: Uninstall packages Windows
+      run: |
+        del "C:\ProgramData\Chocolatey\bin\g++.exe"
+        del "C:\Strawberry\c\bin\g++.exe"
+        del "C:\Program Files\LLVM\bin\clang++.exe"
+        del /s ${JAVA_HOME}
+      if: ${{ runner.os == 'Windows' }}
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4a0bef235..631a5eedc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,20 +9,30 @@ on:
   # Trigger this workflow also on pull_request events.
   pull_request:
 
-jobs:  
-  build:
-    runs-on: ubuntu-latest
+jobs:
+  test:
+    strategy:
+      matrix:
+        platform: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.platform }}
     steps:
       - name: Check out vscode-lingua-franca repository
         uses: actions/checkout@v3
         with:
           submodules: recursive
           fetch-depth: 0
-      - name: Prepare LF build environment
-        uses: ./lingua-franca/.github/actions/prepare-build-env
-      - name: Install VS Code
-        uses: ./.github/actions/install-code
-      - name: Build, deploy, and test the VS Code extension
-        run: |
-          npm install
-          npm run test
+      - uses: lf-lang/vscode-lingua-franca/.github/actions/build@check-versions
+      - name: Run tests
+        run: npm run test
+  test-dependencies-missing:
+    strategy:
+      matrix:
+        platform: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.platform }}
+    steps:
+      - uses: lf-lang/vscode-lingua-franca/.github/actions/build@check-versions
+      # Uninstall operations are needed because we must test that the VS Code extension detects
+      # which tools are present and responds appropriately.
+      - uses: ./.github/actions/uninstall-dependencies
+      - name: Run tests
+        run: npm run test-dependencies-missing
diff --git a/lingua-franca b/lingua-franca
index c5f1c7488..c56002272 160000
--- a/lingua-franca
+++ b/lingua-franca
@@ -1 +1 @@
-Subproject commit c5f1c74885af6857dc99f09c756b738045547da5
+Subproject commit c560022720dbba0478f41bec5a11f9ee04ee378b